SEC Form DEF 14A filed by CubeSmart

A Letter from our CEO Dear Shareholder: Our 2023 results showcased another successful year for the CubeSmart platform. We successfully grew cash flows as the business continued to normalize off the exceptional highs from the post-pandemic period. Our portfolio strategy, with its concentration in top-40 MSAs and focus on high-quality assets with strong demographics, experienced steadier performance as the lower-beta nature of these assets helped to mitigate the impact of the tightest housing market in almost 30 years. Our largest market, New York City, was a leader for our portfolio, as strong demand patterns drove steady, outsized growth. Overall, urban markets, which rely less on housing-related demand, outperformed the more volatile Sun Belt markets throughout the year. Our investments in systems, processes, and people continue to bear fruit as we position ourselves to maximize cash flows through any macro environment. We continue to evolve our operating model as we focus on meeting our customers in the manner they’re most comfortable interacting. We made further refinements to our digital platforms to ensure we’re providing seamless interactions with our customers, while enhancing the overall experience. Our operational focus in 2023 was on simplicity, as we improved efficiency for our teammates to allow them to focus on providing our industry-leading customer service. The focus on simplicity also applied to our efforts to control expenses. We found opportunities to streamline processes to add further efficiencies to our in-store operating model. Our investments in solar helped to mitigate pressure on utility expenses while we also had a successful year appealing property tax assessments. Another year of below-inflationary expense growth helped to expand same-store operating margins by 50 basis points. We remain disciplined with our capital allocation strategy. Volatility in the capital markets created dislocation in the transaction market and limited the opportunity to find investments with attractive risk-adjusted returns that fit into our portfolio strategy. We acquired one store during the year for $22.0 million and had an additional two stores under contract at year end for $20.2 million. Our joint venture development program is another key value creator to enhance our portfolio with infill locations in core markets. We ended the year with four projects in the pipeline with a total anticipated capital contribution of $94.2 million. Our balance sheet is well-positioned to provide financial stability while also providing substantial capacity to fund future growth. At year end, leverage was at 4.1x net debt/EBITDA, well below the range for our BBB/Baa2 investment grade credit rating, providing us with significant capacity to fund future growth. We remain protected from interest rate volatility, with less than 1% of our debt floating rate and just $31.4 million of debt set to mature in 2024. Our well-staggered maturity schedule has a weighted-average maturity of 5.4 years. In December, we announced our 15th consecutive annual increase to our dividend as we continue to share our cash flow growth with our shareholders. We remain focused on growing in a sustainable manner for the benefit of all our stakeholders. We believe achieving our ESG (environmental, social, and governance) objectives complements our business and leads to long-term value creation for our shareholders. Our annual sustainability report provides detail on our ESG program and highlights our various initiatives and performance against our stated sustainability targets. Our strategic focus on quality positions us to produce above-average risk-adjusted returns throughout economic cycles. Our high-quality platform, with its innovative culture and proprietary technological systems, is designed to maximize cash flows across all macro environments. Our high-quality portfolio, with industry-leading demographics in core markets, is designed to produce more stable cash flows and smooth out some of the volatility in the market. Our high-quality balance sheet, with its conservative leverage levels and well-staggered fixed rate maturities, is positioned to efficiently fund future growth. We head into 2024 well-positioned to continue creating long-term value for all of our stakeholders. Sincerely, Christopher P. Marr Trustee, President and Chief Executive Officer 1

NOTICE OF THE 2024 ANNUAL MEETING OF SHAREHOLDERS Notice is hereby given that the 2024 annual meeting of shareholders of CubeSmart will be held on Tuesday, May 21, 2024 at 8:00 a.m. Eastern Time, at the offices of CubeSmart, 5 Old Lancaster Road, Malvern, PA 19355. Record Date Shareholders of record at the close of business on March 22, 2024 are entitled to vote at the meeting. Items of Business • To elect as Trustees the nine individuals named in this proxy statement to serve until our 2025 annual meeting of shareholders and until their successors are duly elected and qualified. • To ratify the appointment of KPMG LLP as our independent registered public accounting firm for the year ending December 31, 2024. • To cast an advisory vote to approve our executive compensation. • To transact such other business as may properly come before the meeting or any adjournment or postponement of the meeting. The proxy statement that follows describes each of these items in detail. Your vote is important. Whether or not you plan to attend the annual meeting, please vote your shares electronically via the Internet, by telephone or, if you receive a paper copy of the proxy materials, by signing, dating, and completing the accompanying proxy card in the enclosed postage-paid envelope. Voting electronically via the Internet, by telephone, or by returning your proxy card in advance of the meeting does not deprive you of your right to attend the meeting. If you attend the meeting, you may vote your shares in person, even if you have previously submitted a proxy in writing, by telephone or via the Internet. This proxy statement includes additional instructions on voting procedures for shareholders whose shares are held by a brokerage firm or other custodian. By Order of the Board of Trustees, Jeffrey P. Foster Chief Legal Officer and Secretary Malvern, Pennsylvania April 5, 2024 2

TABLE OF CONTENTS 3 Section Page Section Page Summary Meeting Information 4 Pre-Approval Policies and Procedures 24 About CubeSmart 5 Compensation Committee 25 2023 Highlights 6 Corporate Governance & Nominating Committee 26 Executive Compensation Highlights 7 Overview 26 Environmental, Social & Governance 8 Overview 8 Oversight & Risk Management 8 Named Executive Officers 28 Environmental 8 Named Executive Officer Compensation 29 Social 9 Compensation Discussion & Analysis 29 Governance 10 CEO Pay Ratio 40 Proposal 1: Election of Trustees 11 Summary Compensation Table 41 Trustee Nominees 12 Grants of Plan-Based Awards 43 Overview of Trustee Nominees 12 Outstanding Equity Awards 44 Details of Trustee Nominees 12 Shares Vested and Options Exercised 46 Summary of Trustee Qualifications 15 Nonqualified Deferred Compensation 46 Trustee Compensation 16 Cash Compensation 16 Equity Awards 16 Pay Versus Performance 51 Trustee Deferred Compensation Plan 16 Ownership of Company Shares 54 Trustee Compensation Table 17 Corporate Governance 18 Corporate Governance Documents 18 Trustee Independence 18 Risk Management 19 Trustee Share Ownership Guidelines 20 Communications with the Board 20 Board Committee Membership and Meetings 21 Board Meetings 21 Questions and Answers About Voting 59 Householding of Proxy Materials 62 Other Matters 63 Board Committees Overview 21 2023 Board Membership Summary 22 Audit Committee 23 FFO and FFO, as adjusted 64 Overview 23 NOI 66 Audit Committee Report 23 Same-Store Results 67 56 Trustee Qualifications, Recruitment & Nominations 26 Severance Plan and Potential Payments Upon Termination or Change in Control Proposal 2 – Ratification of Independent Registered Accounting Firm 48 57 Policies Regarding Transactions with Related Persons 58 Information about Voting and Proxy Materials Appendix – Reconciliation of Non-GAAP Measures 64 59 Non-Executive Chair of the Board; Executive Sessions 21 Proposal 3 – Advisory Vote on Executive Compensation Fees Paid to Independent Registered Accounting Firm 24

SUMMARY MEETING INFORMATION Meeting Details The annual meeting of shareholders will be held on May 21, 2024 at 8:00 a.m. Eastern Time at the offices of CubeSmart, 5 Old Lancaster Road, Malvern, Pennsylvania 19355. Voting Information Voting by Internet and telephone is available 24 hours a day until 11:59 pm Eastern Time on the day before the annual meeting. We have provided to our shareholders a Notice of Internet Availability of Proxy Materials (the “Notice”), which instructs you as to how you may access and review all of the proxy materials on the Internet. The Notice also instructs you as to how you may submit your proxy on the Internet. If you would like to receive a paper or email copy of our proxy materials, at no charge, you should follow the instructions for requesting such materials in the Notice. This proxy statement and related materials are being first mailed or made available to shareholders on or about April 5, 2024. For further details on voting, see the details listed on the proxy card or reference “Information About Voting and Proxy Materials” on page 59. Proposals The following proposals are scheduled to be voted upon at the annual meeting: Proposal Board Recommendation Page for details Election of Trustees For (each nominee) 11 To elect as Trustees the nine individuals named in this proxy statement to serve until our 2025 annual meeting of shareholders and until their successors are duly elected and qualified. Ratification of Independent Registered Public Accounting Firm For 56 To ratify the appointment of KPMG LLP as our independent registered public accounting firm for the year ending December 31, 2024. Advisory Vote on Executive Compensation For 57 To cast an advisory vote on our named executive officer compensation as described in this proxy statement. This proposal, commonly known as a “say-on-pay” proposal, gives our shareholders the opportunity to express their views on our named executive officers’ compensation. This vote is non-binding. 4

(1) FFO is a non-GAAP financial measure. See appendix to this proxy statement for a discussion of non-GAAP financial measures and reconciliations to the most directly comparable GAAP financial measures. ABOUT CUBESMART 5 Who We Are We are a self-administered and self-managed real estate investment trust (“REIT”) focused primarily on the ownership, operation, management, acquisition, and development of self-storage properties in the United States. Our Mission To simplify the organizational and logistical challenges created by the many life events and business needs of our Customers through innovative solutions, unparalleled service, and genuine care. Snapshot at December 31, 2023 1,406 Properties 41 States with operations $13.4 Billion Enterprise value Long-Term Growth Value Creation Strategy Building an industry-leading platform to generate outsized growth from our high-quality portfolio while maximizing long-term shareholder value

2023 HIGHLIGHTS 6 Overview 2023 was another excellent year for CubeSmart. Our sophisticated platform maximized performance, as growth levels normalized following two years of outsized growth during the pandemic. Our innovative team continued to work diligently to execute across our key strategic objectives of: • Delivering robust operational and financial growth: We generated strong rent growth once again as our platform successfully navigated the volatile macro environment. Another year of sector-leading expense controls also supported cash flow growth, leading to another successful year increasing FFO, as adjusted. • Growing our portfolio of high-quality, well-positioned storage assets: We showcased our disciplined capital allocation strategy as the volatile capital market environment presented few external growth opportunities with attractive risk-adjusted returns. We continue to find attractive ways to deploy capital through targeted development in our core markets and redevelopment of select assets to create long-term value. • Maintaining a conservative, unsecured balance sheet: Our predominantly fixed-rate balance sheet with no significant near-term maturities insulated us from the impact of rising interest rates while we further reduced leverage, providing us with significant capacity to fund future external growth. $22.0 M Acquisitions $94.2 M Development Pipeline 4.1x Net Debt/EBITDA 5.9% FFO, as adjusted per share growth (1) 4.2% Same-store NOI growth (1) 3.5% Same-store revenue growth 167 New management contracts 4.1% Dividend increase (2) (1) FFO and NOI are non-GAAP financial measures. See appendix to this proxy statement for a discussion of non-GAAP financial measures and reconciliations to the most directly comparable GAAP financial measures. (2) Increase to quarterly dividend announced December 7, 2023 for the period ending December 31, 2023 and payable January 16, 2024.

EXECUTIVE COMPENSATION HIGHLIGHTS Our executive compensation is designed to attract and retain the best possible executive talent, aligning executive goals with short-term and long-term Company performance. 83% of our CEO’s pay and 71% of our other NEOs’ pay was incentive-based in 2023, tying our NEOs’ compensation to Company and shareholder success. 2023 CEO Compensation 2023 other NEO Compensation For further details on our executive compensation, please see the Named Executive Officer Compensation section of this report on pages 29-53. 7 Christopher P. Marr President and Chief Executive Officer $ 884,000 $ 1,480,479 $ 4,099,971 $ 255,234 $ 6,719,684 Timothy M. Martin Chief Financial Officer and Treasurer $ 550,000 $ 697,813 $ 1,549,968 $ 127,089 $ 2,924,870 Joel D. Keaton Chief Operating Officer $ 500,000 $ 571,875 $ 975,031 $ 93,367 $ 2,140,273 Jeffrey P. Foster Chief Legal Officer and Secretary $ 484,000 $ 491,260 $ 649,987 $ 92,418 $ 1,717,665 Jennifer L. Schulte Chief Human Resources Officer $ 337,000 $ 169,595 $ 340,039 $ 64,576 $ 911,210 Total All Other Compensation Named Executive Officer (“NEO”) Position Salary Long-Term Equity Award Annual Incentive Award 2023 Compensation Summary

Overview In order to achieve our long-term goals, we strive to be a good corporate citizen. Our core values provide the backbone of our company culture, ensuring that we operate with integrity and genuine care. Our Environmental, Social & Governance (“ESG”) initiatives further support our efforts to grow our business in a sustainable manner that is beneficial to all of our stakeholders while adhering to these core values. We continue to prioritize opportunities to reduce the environmental impact of our stores; improve engagement with our teammates, investors, and the communities in which we operate; and maintain sound corporate governance practices. Oversight & Risk Management Our ESG initiatives are broadly managed by an internal committee chaired by our Chief Financial Officer and includes senior team members from across major functions of the organization who have the subject-matter expertise to provide input into ESG topics. The Corporate Governance & Nominating Committee of our Board of Trustees (the “Board”) oversees our ESG efforts. Our senior management team regularly reports to the Board on the status of our ESG program, our performance against the goals we’ve set, and the various initiatives we’ve undertaken to improve our sustainability. These ESG initiatives complement our broader program of risk management. We regularly evaluate our portfolio for risks within our key markets and individual assets. Self-storage properties have low obsolescence, and we invest in maintenance and capital projects to further extend the useful life of our stores. While we remain focused on climate-related risks that could impact our portfolio, we believe the significant regional diversification and the low emissions and energy consumption of our stores help to mitigate the climate and environmental regulatory risks to our portfolio. Environmental We are focused on our environmental impact and are committed to reducing our already small environmental footprint. Self-storage has a relatively low impact on the environment as it consumes less energy and water while emitting fewer greenhouse gases than other real estate property types. We leverage a streamlined communication process for our local property managers to notify us of any physical issues with our properties that would have an adverse impact on energy or water usage. Additionally, we utilize a centralized system to monitor utility usage data in real time to identify potentially hidden issues and find opportunities for improvement. Our facilities team is empowered to address these issues quickly to ensure our portfolio operates efficiently. We also continue to invest in a variety of environmentally-focused initiatives to further reduce our impact: • Solar: Our solar program reduces our carbon footprint through the production of renewable energy while also producing attractive financial returns. At the end of 2023, we had 107 owned properties, or 17.5% of our owned portfolio, with operating solar panels. • High Efficiency Lighting Retrofit: In 2022, we kicked off a three-year interior lighting upgrade project. We’ve replaced existing lighting with energy efficient LEDs at 162 stores to date, with an additional 33 scheduled for 2024. This interior lighting project follows our exterior lighting upgrades at 304 stores since 2018. • HVAC Upgrade: From 2020-2022, we invested $16.4M across our owned portfolio to upgrade HVAC systems with equipment that meets Energy Star requirements and eliminates the use of R22 refrigerant which had produced elevated CFC emissions. • Energy Management Systems ("EMS"): 103 high-usage owned stores across the portfolio are equipped with an EMS which monitors and automates the timing of energy use. • Paper and Toner Reduction: Continued adoption of our online rental platform, SmartRental, has furthered our efforts to reduce paper and toner usage at our stores. ENVIRONMENTAL, SOCIAL & GOVERNANCE 8

ENVIRONMENTAL, SOCIAL & GOVERNANCE 9 Social At CubeSmart, we refer to our employees as teammates, because collaboration towards shared goals defines our workplace. We care deeply about the experience our teammates have working with us. The CubeSmart work experience takes a holistic approach to our teammates’ total wellbeing at work. Our teammate value proposition includes promoting a sense of belonging to a team; providing opportunities to make a meaningful difference at work and in their communities; supporting our teammates’ ongoing personal and professional development; and offering competitive pay and benefits. Diversity and Inclusion Our Diversity, Equity, and Inclusion Policy prohibits discrimination on the basis of any legally protected characteristic and outlines the Company’s commitment to promoting diversity, equality and inclusion. CubeSmart’s Philosophy Regarding Respect in the Workplace outlines the importance of diversity within the organization and must be acknowledged by all teammates. Teammates are required to participate in diversity and unconscious bias training on an annual basis. The following summarizes our gender and racial/ethnic diversity as of December 31, 2023: Teammate Development During 2023, we provided an average of 18 hours of training per teammate. We also provide a tuition reimbursement program for advancing formal education. We believe in building from within and that the most successful future CubeSmart leaders are already part of our organization. We develop leaders by offering multiple programs that help our teammates understand our culture and grow in their professional skillset. In 2023, 350 teammates were promoted into new roles and/or transitioned into new positions to further their career development. Teammate Engagement In 2023, 92% of our teammates participated in our annual engagement survey. Results are communicated within individual teams to share what we learned and where we have opportunities to improve. We’ve also invested in a Company-wide recognition platform to facilitate meaningful appreciation for the accomplishments of our teammates.

ENVIRONMENTAL, SOCIAL & GOVERNANCE Customers Our customers are the foundation of our business, and we are focused on providing the most positive self-storage customer experience possible. We regularly obtain feedback from our customers through a variety of channels, including surveys and reviews. We take this feedback seriously and use it to improve the overall customer experience. Supply Chain & Human Rights The CubeSmart Human Rights Policy promotes the principles of the United Nations Universal Declaration of Human Rights and states that the Company will not engage in child labor, modern slavery, or other human rights violations while also providing accountability for ethical business conduct. The CubeSmart Code of Ethics, Conduct & Human Rights for Vendors and Suppliers holds those that we work with to these high standards, ensuring that we’re doing our part to promote ethical conduct throughout our supply chain. A copy of the policies referenced in this section are available in the Corporate Responsibility section of our investor relations website at investors.cubesmart.com. Such policies are not incorporated by reference into this proxy statement. Governance We remain committed to strong corporate governance practices and the highest ethical standards, ensuring accountability while effectively managing risk. For further details on our corporate governance, see pages 18 to 27 of this proxy statement. 10

PROPOSAL 1: ELECTION OF TRUSTEES Our Board is currently comprised of nine Trustees. The term of each Trustee expires at the annual meeting. Our Board, upon the recommendation of its Corporate Governance & Nominating Committee, has nominated the nine current Trustees for election: Piero Bussani, Jit Kee Chin, Dorothy Dowling, John W. Fain, Jair K. Lynch, Christopher P. Marr, John F. Remondi, Jeffrey F. Rogatz and Deborah R. Salzberg. The Board affirmatively determined that eight of the nine nominees (Piero Bussani, Jit Kee Chin, Dorothy Dowling, John W. Fain, Jair K. Lynch, John F. Remondi, Jeffrey F. Rogatz and Deborah R. Salzberg) are “independent” Trustees under the rules of the New York Stock Exchange (the “NYSE”). The Board knows of no reason why any nominee would be unable or unwilling to serve as a Trustee. If any nominee is unable or unwilling to serve, the Board may designate a substitute nominee and the persons designated as proxy holders will vote for the substitute nominee recommended by the Board, or the Board may decrease the size of our Board, as permitted by the Bylaws of CubeSmart (the “Bylaws”). Each nominee has consented to be named in this proxy statement and has agreed to serve if elected. When considering whether nominees for Trustee are qualified to enable the Board to fulfill its oversight responsibilities effectively in light of our business and structure, the Corporate Governance & Nominating Committee and the Board focused primarily on the information summarized in each of the nominee’s individual biographies set forth below, all of which contributed to our conclusion that our nominees should be re-elected to serve as trustees. The Board unanimously recommends that shareholders vote in favor of the election of each of the nine nominees to serve as Trustees until the 2025 annual meeting of shareholders and until their successors are duly elected and qualified. 11

TRUSTEE NOMINEES Overview of Trustee Nominees Name Age Primary Occupation Trustee Since Piero Bussani 59 Chief Legal Officer for Homebound.com 2010 Jit Kee Chin 45 Chief Data and Innovation Officer for Suffolk Construction Corporation 2022 Dorothy Dowling 67 Managing Director at Horwath HTL 2017 John W. Fain 70 Retired Senior Vice President of Sales and Marketing at UPS Freight 2012 Jair K. Lynch 52 Chief Executive Officer of Jair Lynch Real Estate Partners 2022 Christopher P. Marr 59 President and Chief Executive Officer of CubeSmart 2014 John F. Remondi 62 Former President, Chief Executive Officer and Director of Navient 2009 Jeffrey F. Rogatz 62 Managing Director with Robert W. Baird and Co. 2011 Deborah R. Salzberg 70 Principal, Uplands Real Estate Partners 2013 Details of Trustee Nominees Piero Bussani Age: 59 Trustee Since: 2010 Qualifications: Mr. Bussani has significant business and legal experience across various real estate classes. This experience includes leasing, property management, customer retention, and risk mitigation. Current and Prior Experience: • Chief Legal Officer for Homebound.com • Chief Legal Officer and Global Head—Legal and Risk for Blackstone Group’s real estate operations platform, ReVantage Corporate Services • Managing Director and Chief Legal Officer for Digital Bridge Holdings, LLC • Executive Vice President for Invitation Homes • General Counsel and Executive Vice President of Development for Extended Stay Hotels • Associate in litigation and real estate groups for Arent Fox Kintner Plotkin & Kahn 12 Jit Kee Chin Age: 45 Trustee Since: 2022 Qualifications: Dr. Chin has significant experience as a senior executive in the construction industry with a focus on strategy, analytics, and technological infrastructure. Current and Prior Experience: • Chief Data and Innovation Officer for Suffolk Construction Corporation • Cofounder, Suffolk Technologies • Senior Expert in analytics and Associate Principal for McKinsey & Company • Board member for STAG Industrial, Inc., a publicly-traded industrial REIT

Dorothy Dowling Age: 67 Trustee Since: 2017 Qualifications: Ms. Dowling has significant experience as a senior executive in the hospitality and travel industries with a focus on digital and information technologies, customer service, and marketing. Current and Prior Experience: • Managing Director at Horwath HTL • Chief Marketing Officer and Senior Vice President of Sales for BWH Hotel Group (formerly Best Western Hotels and Resorts) • Vice President of Operations for Parks and Attractions for ARAMARK • President and COO of Travelodge Canada • Various executive and leadership positions with Royal Host REIT and Forte Hotels • Board member of the Global Business Travel Association and President of the GBTA Allied Leadership Council TRUSTEE NOMINEES John W. Fain Age: 70 Trustee Since: 2012 Qualifications: Mr. Fain has knowledge and executive experience in the transportation and logistics arena as well as experience in real estate law. Current and Prior Experience: • Various executive roles with Overnite Transportation Company, now part of UPS Freight • Associate in real estate law for McGuire Woods • Board member, Virginia Trucking Association • Board member and Chairman Emeritus, Greater Richmond YMCA • Director and member of the audit and compensation committees of Virginia Business Bank Jair K. Lynch Age: 52 Trustee Since: 2022 Qualifications: Mr. Lynch has considerable experience in the acquisition, development and management of mixed-use real estate properties. Current and Prior Experience: • Founder and CEO of Jair Lynch Real Estate Partners • Board & committee memberships: • United States Olympic Committee • Initiative for a Competitive Inner City • The Developer Roundtable • Sidwell Friends School • Federal City Council 13

TRUSTEE NOMINEES John F. Remondi Age: 62 Trustee Since: 2009 Qualifications: Mr. Remondi has considerable financial management experience, including service as chief executive officer and chief financial officer at a Fortune 100 financial services company. Current and Prior Experience: • President, Chief Executive Officer and member of the Board of Directors of Navient • President and Chief Executive Officer, Sallie Mae • Portfolio Manager for PAR Capital Management Group • Executive Vice President, Corporate Finance, SLM Corporation • Various corporate finance positions with New England Education Loan Marketing Corporation and BayBank Boston • Chairman of the Board of Directors of Reading is Fundamental • Board member for Nellie Mae Education Foundation Jeffrey F. Rogatz Age: 62 Trustee Since: 2011 Qualifications: Mr. Rogatz has extensive experience working with real estate investment trusts and serving on boards of directors. Current and Prior Experience: • Managing Director with Robert W. Baird & Co., an investment banking firm • Co-founder of Palladian Realty Capital, which provides consulting and advisory services to real estate companies • Founder of Triangle Real Estate Advisors LLC, a real estate asset management company • Founder and President of Ridgeway Capital LLC, a real estate investment and advisory firm • Chief Financial Officer of Brandywine Realty Trust • Managing Director and head of the REIT practice for Legg Mason Wood Walker • Member of Board of Directors of CapLease, Inc., a publicly-traded diversified REIT • Member of William and Mary Business School Foundation Board 14 Christopher P. Marr Age: 59 Trustee Since: 2014 Qualifications: Mr. Marr has experience with boards of directors and real estate investment trusts and, in particular, knowledge and experience in the self-storage industry. Mr. Marr has gained extensive knowledge of our business through his service to our Company since 2006 and his former role with Storage USA, Inc. Current and Prior Experience: • President and CEO of CubeSmart (2014-present) • President, Chief Operating Officer and Chief Investment Officer of CubeSmart (2012-2013) • President and Chief Investment Officer of CubeSmart (2008-2012) • Chief Financial Officer of CubeSmart (2006-2008) • Senior Vice President and Chief Financial Officer of Brandywine Realty Trust (2002-2006) • Chief Financial Officer of Storage USA, Inc. (1998-2002) • Board member for STAG Industrial, Inc., a publicly-traded industrial REIT

TRUSTEE NOMINEES Deborah R. Salzberg Age: 70 Trustee Since: 2013 Qualifications: Ms. Salzberg has experience serving on boards of directors and has knowledge and experience in the planning, development, construction and management of new construction, adaptive re-use and redeveloped real estate projects. Current and Prior Experience: • Principal at Uplands Real Estate Partners, which specializes in real estate and financial investing • 35 years’ experience in the real estate sector • Washington, DC Region Chair of Brookfield Properties • President of Forest City Washington, a division of Forest City Realty Trust • Trial attorney in the Civil Division of the U.S. Department of Justice • Board member, Capital Bank • Member of Board of Trustees for The Foundation for National Archives and Planet Word • Member of Real Estate Advisory Committee for the New York State Common Retirement Fund • Board Member, University of Pennsylvania Institute of Urban Research • Member of Federal City Council Summary of Trustee Qualifications 15

TRUSTEE COMPENSATION The Compensation Committee, with the input of Frederic W. Cook & Co. (“FW Cook”), an independent compensation consultant retained by the committee, reviews our Trustee compensation program on an annual basis. Trustees are compensated through an annual cash retainer and an annual equity award. Cash Compensation Independent Trustees were paid an $80,000 annual base cash retainer for service in 2023, as well as additional supplemental cash retainers for the following positions: Position Annual Supplemental Cash Retainer Board—Chair $ 70,000 Audit Committee—Chair $ 30,000 Audit Committee—Member $ 12,000 Compensation Committee—Chair $ 30,000 Compensation Committee—Member $ 10,000 Corporate Governance and Nominating Committee—Chair $ 15,000 Corporate Governance and Nominating Committee—Member $ 7,750 Independent Trustees may also elect to receive all or a portion of their cash compensation in the form of restricted shares. Equity Awards On May 16, 2023, we granted to each independent Trustee time-based restricted shares with an aggregate grant-date target value of $120,000. The number of restricted shares granted was determined by dividing the target value of $120,000 by the average of the trailing 30-day closing price for our common shares preceding the date of grant. Each Trustee received 2,601 restricted shares with an aggregate value for each Trustee of $117,721 based on the closing share price as of the grant date. These shares will vest on the earlier of the first anniversary of the grant date or the Company’s annual meeting of shareholders in 2024. Trustee Deferred Compensation Plan Each plan year, independent Trustees may elect to defer all or a portion of their cash compensation and have such amounts credited to accounts until distributed in accordance with the plan and the participants’ distribution elections. Each distribution account is credited with the returns of the investment options selected by plan participants, which include investment options that are available in our 401(k) plan, or such other investment funds as the Board may designate from time to time. 16

TRUSTEE COMPENSATION Trustee Compensation Table Our independent Trustees received the following compensation for the year ended December 31, 2023: Piero Bussani $ 95,000 $ 117,721 $ 4,540 $ 217,261 Jit Kee Chin $ 81,000 $ 117,721 $ 4,997 $ 203,718 Dorothy Dowling $ 107,625 $ 117,721 $ 5,705 $ 231,051 John W. Fain $ 88,625 $ 117,721 $ 4,938 $ 211,284 Jair K. Lynch $ 83,625 $ 117,721 $ 4,540 $ 205,886 John F. Remondi $ 110,000 $ 117,721 $ 4,540 $ 232,261 Jeffrey F. Rogatz $ 91,000 $ 117,721 $ 4,540 $ 213,261 Deborah R. Salzberg $ 130,000 $ 117,721 $ 4,540 $ 252,261 Trustee Fees Earned or Paid in Cash (1) Share Awards (2) Total All Other Compensation (3) (1) Ms. Dowling and Mr. Fain elected in 2022 to have a portion of their cash compensation, including a portion that would have otherwise been paid in 2023, instead paid as restricted shares that were granted in 2022 as noted in last year’s proxy statement. The cash amounts in the table above include such cash amounts related to service in 2023 that were paid as restricted shares in 2022. (2) On May 16, 2023, each independent Trustee was granted 2,601 restricted shares which vest on the earlier of the first anniversary of the grant date or the Company’s annual meeting of shareholders in 2024. The amounts listed in this column reflect the grant date fair value of the award in accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 718, Compensation— Stock Compensation (“FASB ASC Topic 718”). Assumptions used in the calculation of these amounts are included in Note 16, “Share-Based Compensation Plans,” in the notes to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2023 filed with the Securities and Exchange Commission (“SEC”) on February 29, 2024. As of December 31, 2023, each of the independent Trustees named above had 2,601 unvested restricted shares. (3) Includes dividends paid on unvested restricted shares. 17

CORPORATE GOVERNANCE Corporate Governance Documents Our Board maintains Corporate Governance Guidelines and a Code of Business Conduct and Ethics. To view these documents, as well as the charters of each of the Board Committees, please visit our investor relations website at investors.cubesmart.com. Each of these documents is also available in print, free of charge, to any shareholder who requests them in writing to Secretary of CubeSmart, CubeSmart, 5 Old Lancaster Road, Malvern, Pennsylvania 19355. Trustee Independence NYSE listing standards require listed companies to have a majority of independent board members and to have each of the audit, compensation, and corporate governance & nominating committees comprised solely of independent Trustees. Under the listing standards and other independence requirements of the NYSE, for a Trustee to qualify as “independent,” our Board must affirmatively determine that the Trustee has no material relationship with us (either directly or as a partner, shareholder or officer of an organization that has a relationship with us). The Board evaluated the status of each Trustee who served on our Board during 2023. In its evaluation of Trustee independence, our Board considers all commercial, charitable and other transactions and relationships (including tenure of Board service) that any Trustee or member of his or her immediate family may have with us, with any of our affiliates, or with any of our consultants or advisers. Our Board applies the same criteria for assessing independence for purposes of each of the Audit Committee, Corporate Governance & Nominating Committee and Compensation Committee (collectively, the “Board Committees”). Furthermore, in its assessment of a Trustee’s independence for service on the Compensation Committee, our Board considers all factors the Board believes specifically relevant to determining whether the Trustee has a relationship which is material to such Trustee’s ability to be independent from management in connection with his or her duties as a member of the Compensation Committee, including but not limited to any compensation payable to such Trustee. In addition, no member of the Audit Committee or Compensation Committee may accept, directly or indirectly, any consulting, advisory or other compensatory fee from us (other than fees for service as a Trustee and member of Board committees) or be an affiliate of us. After broadly considering all facts and circumstances, the Board affirmatively determined that each of our Trustees (other than Mr. Marr) meets the independence requirements of the NYSE because each has no material relationship with us. Our Board determined that Mr. Marr is not independent because of his current position with us as an NEO. 18

Risk Oversight The Audit Committee oversees risks associated with financial and regulatory matters— particularly financial reporting, tax, accounting, cybersecurity, disclosure, internal controls over financial reporting, investment guidelines, material litigation, and credit and liquidity matters. The Compensation Committee oversees risks associated with executive compensation programs and arrangements (including incentive plans) and succession planning. The Corporate Governance & Nominating Committee oversees risks associated with Board leadership planning, as well as environmental, social, reputational, and corporate governance matters. CORPORATE GOVERNANCE Risk Management Our Board and the Board Committees, as described below, have oversight of our risk management policies and procedures. In addition, our NEOs are directly responsible for our enterprise risk management function. These officers report to the relevant Board Committees regarding these risks and develop programs and recommendations to control the risks identified. The Board Committees then report their discussions with these officers to the Board. 19 In fulfilling their risk management responsibilities, our NEOs have developed management reporting processes that are designed to provide visibility to the Board regarding the identification, assessment, management, and mitigation of critical risks. Not less than quarterly, our NEOs conduct a risk disclosure meeting with members of senior management to discuss financial, legal, regulatory, technology, compliance, cybersecurity, and reputational risks. Our NEOs also report directly to the Board on at least an annual basis to apprise them directly of our risk management efforts. Management at levels below our NEOs also participates in the implementation of our risk management policy by conducting regular reviews of all enterprise risk management policies and procedures and recommending revisions to Company controls and policies. Finally, we retain outside consultants to review relevant risks and to recommend policies and programs to minimize the impact of any risks identified in connection with such review. Cybersecurity Risk Management and Strategy We recognize the importance of developing, implementing and maintaining robust measures to safeguard our electronic information systems and we have established processes, described below, to assess, identify, manage and mitigate risks from cybersecurity threats and cybersecurity incidents. We believe our processes are reasonable for real estate companies of our size and complexity.

CORPORATE GOVERNANCE 20 We face risks associated with security breaches through cyber attacks, cyber intrusions, or otherwise, as well as other significant disruptions of our information technology networks and related systems. The Audit Committee is responsible for overseeing management’s risk assessment and risk management processes designed to monitor and control information security risk. A cross-organizational cyber task force meets regularly and management briefs the Audit Committee on information security matters at least once a year. We have adopted and implemented an approach to identify and mitigate information security risks that we believe are commercially reasonable for real estate companies. We leverage the Center for Internet Security Critical Security Control Framework as the core of our governance program and include additional best practices from the Cloud Security Alliance, vendors, and other sources as necessary. We have not experienced any information security breaches that resulted in significant financial loss. We have insurance coverage designed to help us mitigate cyber risk exposure by offsetting costs involved with recovery and remediation after an information security breach or similar event. We regularly engage independent third parties to test our information security processes and systems as part of our overall enterprise risk management. We also regularly conduct information security training to ensure all employees, including those who may come into possession of confidential financial or personally identifiable information, are aware of information security risks and to enable them to take steps to mitigate such risks. For more information regarding oversight of cybersecurity-related risks, see Item 1C of our Annual Report on Form 10-K for the year ended December 31, 2023 filed with the SEC on February 29, 2024. Trustee Share Ownership Guidelines We maintain share ownership guidelines for our Board to ensure that each Trustee maintains a material personal financial stake in the Company, aligning the interests of our Board with the interests of our shareholders. We expect each Trustee to acquire, within five years of his or her appointment, and thereafter to maintain ownership of, common shares having a market value equal to five times the Trustee’s annual base cash retainer. All of our Trustee candidates with the requisite years of service are in compliance with these guidelines. Communications with the Board Shareholders and other interested parties may communicate with the Board or with the independent Trustees, as a group or individually, by communicating directly with the Chair of the Board. Please send any correspondence in writing to the “Chair of the Board” c/o Secretary of CubeSmart, 5 Old Lancaster Road, Malvern, Pennsylvania 19355, who will then directly forward your correspondence to the Chair of the Board. The Chair will decide what action should be taken with respect to the communication, including whether such communication should be reported to the Board.

BOARD COMMITTEE MEMBERSHIP AND MEETINGS Board Meetings Our Board holds regular and special meetings throughout the year. During 2023, the Board held seven meetings. Each Trustee is expected to attend, in person or by telephone, all Board meetings and meetings of Board Committees on which he or she serves. During 2023, each Trustee attended at least 75% of the Board and Board Committee meetings on which he or she served. Pursuant to our Corporate Governance Guidelines, all of our Trustees are expected to attend our annual meetings of shareholders. All of our Trustees attended our 2023 annual meeting of shareholders. Non-Executive Chair of the Board; Executive Sessions Although our Corporate Governance Guidelines do not require the separation of the roles of Chair of the Board from the Chief Executive Officer, our Board believes that independent Board leadership is an important corporate governance practice. Since May 2022, Deborah R. Salzberg has served as our Non-Executive Chair of the Board. Christopher P. Marr serves as our President and Chief Executive Officer and as a Trustee. Separating the positions of Chair of the Board and Chief Executive Officer allows us to achieve independent oversight and evaluation of our senior management and assures effective communication between the Board and senior management on corporate strategy, while simultaneously allowing our Chief Executive Officer to focus on growing our business and implementing our strategic business plans. Our Non-Executive Chair of the Board is charged primarily with: • presiding over meetings of our Board and shareholders, including executive sessions of the independent Trustees; • establishing an agenda and setting the timing and length for each Board meeting in collaboration with our Chief Executive Officer and other Trustees, and meeting with our Chief Executive Officer following each meeting to discuss any open issues and follow-up items; • facilitating and coordinating communication among the independent Trustees and our Chief Executive Officer and an open flow of information between management and our Board; • facilitating and coordinating communication among our shareholders and our Board; • periodically meeting with each independent Trustee; • assisting and consulting with our Chief Executive Officer, as necessary; • coordinating the periodic review of management’s strategic plan; and • performing such other duties and services as our Board may require. Pursuant to our Corporate Governance Guidelines and the independence requirements of the NYSE, in order to promote open discussion among independent Trustees, our Board devotes a portion of each regularly scheduled Board meeting to sessions of independent Trustees without management participation. The Chair of the Board presides over these executive sessions. Board Committees Overview The Board has a standing Audit Committee, Compensation Committee and Corporate Governance & Nominating Committee. All members of these committees are “independent” as that term is defined in the listing standards and other independence requirements of the NYSE. The Board has adopted a written charter for each of its Board Committees. The full text of each charter is available on our investor relations website, investors.cubesmart.com. In addition, each charter is also available in print, free of charge, to any shareholder who requests a copy in writing to Secretary, CubeSmart, 5 Old Lancaster Road, Malvern, Pennsylvania 19355. 21

BOARD COMMITTEE MEMBERSHIP AND MEETINGS 2023 Board Membership Summary The table below details membership information for each of the Board Committees and the number of meetings held by each committee during 2023. Member Chair 22

Overview The principal purposes of the Audit Committee are to assist the Board in the oversight of: • the integrity of our consolidated financial statements; • our compliance with legal and regulatory requirements; • the qualification and independence of our independent registered public accounting firm; • the performance of our internal audit function and independent registered public accounting firm; and • the Company’s risk management policies that relate to the internal financial controls environment, financial reporting and disclosure controls, and cybersecurity. The Audit Committee is directly responsible for the appointment, compensation, retention and oversight of the work of our independent registered public accounting firm and is also responsible for reviewing with our independent registered public accounting firm any audit problems or difficulties they encounter during their audit. The Audit Committee is also charged with reviewing our consolidated financial statements, any financial reporting issues, and the adequacy of internal controls with management and our independent registered public accounting firm. The Board determined that Mr. Remondi (Chair), Ms. Chin, Mr. Fain, and Mr. Rogatz are each an “audit committee financial expert” as defined by the rules and regulations of the SEC. Audit Committee Report One of the principal purposes of the Audit Committee is to assist the Board in the oversight of the integrity of our consolidated financial statements. Our management team has the primary responsibility for our consolidated financial statements and the reporting process, including our system of internal controls and disclosure controls and procedures. For fiscal year 2023, KPMG LLP, our independent registered public accounting firm, audited the annual consolidated financial statements prepared by management in accordance with the standards of the Public Company Accounting Oversight Board (“PCAOB”) and expressed an opinion on the conformity of those consolidated financial statements with accounting principles generally accepted in the United States of America. In carrying out its responsibilities, the Audit Committee has reviewed and discussed our audited consolidated financial statements for the year ended December 31, 2023 with management. Management represented to the Audit Committee that our consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States of America. The Audit Committee is also responsible for assisting the Board in the oversight of the qualification, independence, and performance of KPMG LLP. The Audit Committee discussed with KPMG LLP the matters required to be discussed by PCAOB Auditing Standard No. 1301, Communications with Audit Committees. The Audit Committee has received from KPMG LLP the written disclosures, in accordance with the applicable requirements of the PCAOB regarding KPMG LLP’s communications with the Audit Committee, concerning independence and has discussed with KPMG LLP its independence. In addition, the Audit Committee has determined that KPMG LLP’s provision of non-audit services, and the fees charged for such non-audit services, are compatible with maintaining KPMG LLP’s independence. Based on the reviews and discussions described above, the Audit Committee recommended to the Board that our audited consolidated financial statements for fiscal year 2023 be included in our Annual Report on Form 10-K for the year ended December 31, 2023. Respectfully submitted, The Audit Committee of the Board of Trustees John F. Remondi (Chair) Jit Kee Chin John W. Fain Jair K. Lynch Jeffrey F. Rogatz AUDIT COMMITTEE 23

Notwithstanding anything to the contrary set forth in any of our previous or future filings under the Securities Act of 1933 (the “Securities Act”) or the Securities Exchange Act of 1934 (the “Exchange Act”) that might incorporate this proxy statement or future filings with the SEC, in whole or in part, the above report shall not be deemed to be “soliciting material” or “filed” with the SEC and shall not be deemed to be incorporated by reference into any such filing. Fees Paid to Independent Registered Public Accounting Firm The following table summarizes the fees billed by KPMG LLP for services rendered during, or in connection with, our 2023 and 2022 fiscal years. 2023 2022 Audit fees (1) $ 1,085,000 $ 1,065,000 Audit-related fees - - Tax fees (2) $ 517,000 $ 474,100 All other fees (3) $ 1,780 $ 1,780 Total $ 1,603,780 $ 1,540,880 (1) Audit fees include fees for professional services provided in connection with the annual audits of the Company's consolidated financial statements and internal control over financial reporting, reviews of the Company's interim consolidated financial statements included in quarterly reports on Form 10-Q, consents related to registration statements and the issuance of comfort letters. (2) Tax fees relate to tax compliance and consulting services. (3) All other fees represent license fees for accounting research software. All audit and permissible non-audit services provided by KPMG LLP were approved by the Audit Committee, either pursuant to the Audit Committee’s Audit and Non-Audit Services Pre-Approval Policy (the “Pre-Approval Policy”) or through a separate pre-approval by the Audit Committee, which concluded that the services provided were compatible with KPMG LLP’s independence. Pre-Approval Policies and Procedures The Audit Committee’s policy is to review and pre-approve, either pursuant to the Pre-Approval Policy or through a separate pre-approval by the Audit Committee, any engagement of our independent registered public accounting firm to provide any audit or permissible non-audit service to us. Pursuant to the Pre-Approval Policy, which is reviewed and reassessed annually by the Audit Committee, a list of specific services including audit, audit-related, tax and other services are specifically pre-approved for the upcoming or current fiscal year, subject to an aggregate maximum annual fee payable by us for each category of pre-approved services. Any service that is not included in the approved list of services must be separately pre-approved by the Audit Committee. In addition, all audit and permissible non-audit services in excess of the pre-approved fee level, whether or not included on the approved list of services, must be separately pre-approved by the Audit Committee. The Audit Committee has delegated authority to its chair to specifically pre-approve engagements for the performance of audit and permissible non-audit services, for which the estimated cost for each specified type of service shall not exceed $200,000. The chair must report all pre-approval decisions to the Audit Committee at its next scheduled meeting and provide a description of the terms of the engagement, including (a) the type of services covered by the engagement, (b) the dates the engagement is scheduled to commence and terminate, (c) the estimated fees payable by us pursuant to the engagement, (d) other material terms of the engagement, and (e) such other information as the Audit Committee may request. AUDIT COMMITTEE 24

COMPENSATION COMMITTEE The principal purposes of the Compensation Committee are to: • review and approve our corporate goals and objectives with respect to the compensation of our Chief Executive Officer, evaluate the Chief Executive Officer’s performance in light of those goals and objectives, and determine and approve, either as a committee or with our other independent Trustees, the appropriate level and structure of the Chief Executive Officer’s compensation; • determine and approve, either as a committee or together with our other independent Trustees, the compensation of the other NEOs; • review, assess and recommend a succession plan for our Chief Executive Officer; • make recommendations to the Board regarding compensation of Trustees; and • recommend, implement, and administer our incentive and equity-based compensation plans. The Compensation Committee’s primary responsibility is to determine and implement our compensation policies and practices. In connection with its review of compensation levels and structure, the Compensation Committee has authority to recommend approval by the Board of grants of equity-based awards to our NEOs, officers and employees. The Board, however, has the ultimate authority to approve grants of equity-based awards to our NEOs, officers and employees. With respect to compensation of our NEOs other than our Chief Executive Officer, the Compensation Committee considers recommendations made by our Chief Executive Officer. In addition, the Board has delegated to our Chief Executive Officer the authority to make one-time grants of equity-based awards to non-executive, newly hired or promoted, non-officer level employees in an amount not to exceed the equivalent of $100,000. Our Chief Executive Officer must regularly report to the Compensation Committee information concerning the grants that are made pursuant to this authority. The Board has not delegated authority with respect to NEO or Trustee compensation to any other group or person. In evaluating executive compensation, the Compensation Committee is authorized to retain and to authorize fees and other terms of engagement for advisors such as, but not limited to, compensation consultants and legal counsel. The Compensation Committee also has authority to delegate matters to one or more subcommittees as it deems necessary and appropriate. Since 2011, the Compensation Committee has retained FW Cook to review our compensation and benefits program, analyze competitive market compensation practices, develop our compensation peer group, and make recommendations relating to our executive compensation programs. The Compensation Committee assessed the independence of FW Cook under NYSE rules and concluded that the firm’s work for the Compensation Committee does not raise any conflict of interest. Factors considered by the Compensation Committee include: (i) whether other services are provided to us by FW Cook or its representatives; (ii) the amount of fees received by FW Cook from us as a percentage of its total revenue; (iii) policies of FW Cook designed to prevent conflicts of interest; (iv) whether FW Cook or its representatives have any business or personal relationship with any member of the Compensation Committee; (v) whether FW Cook or its representatives own any of our securities; and (vi) whether FW Cook or its representatives have any business or personal relationship with any of our NEOs. The Compensation Committee has the authority to make recommendations to the Board regarding Trustee compensation levels and structure. The Board, however, has the ultimate authority to approve Trustee compensation levels and grants of equity-based awards to our Trustees. The Compensation Committee currently consists of Ms. Dowling (Chair) and Messrs. Bussani, Remondi and Rogatz. Each member of the Compensation Committee is independent within the meaning of the listing standards and other independence requirements of the NYSE. Compensation Committee Interlocks and Insider Participation None of the members of the Compensation Committee, during 2023 or as of the date of this proxy statement, is or has been an officer or employee of ours and no NEO of ours served on the Compensation Committee or board of any company that employed any member of our Compensation Committee or Board. 25

CORPORATE GOVERNANCE & NOMINATING COMMITTEE Overview The principal purposes of the Corporate Governance & Nominating Committee are to: • identify individuals that are qualified to serve as Trustees; • recommend such individuals to the Board, either to fill vacancies that occur on the Board from time to time or in connection with the selection of Trustee nominees for each annual meeting of shareholders; • periodically assess the size of the Board to ensure the Board can effectively carry out its obligations; • develop, recommend, implement, and monitor the Corporate Governance Guidelines and the Code of Business Conduct and Ethics adopted by the Board; • review any related party transactions and procedures for evaluating and approving such transactions; • oversee the evaluation of the Board and Board Committees; • ensure that the Company is in compliance with all corporate governance requirements under the NYSE listing requirements and applicable securities laws; • review and assess risks and exposures associated with the Company’s corporate policies and practices related to sustainability, corporate social responsibility, and corporate governance matters; and • review and assess risks and exposures associated with the leadership of the Board and any Board Committees. Trustee Qualifications, Recruitment & Nominations Our Board believes that its membership should consist of individuals with sufficiently diverse and independent backgrounds and with the appropriate expertise required to serve as a director of the Company. The Corporate Governance & Nominating Committee is responsible for ensuring that the Board meets this objective and is responsible for reviewing the qualifications of potential trustee candidates and recommending trustee candidates to be nominated for election to the Board. In considering potential candidates for trustee, the committee considers the entirety of each candidate’s qualifications and credentials. Qualifications and credentials for consideration as a trustee nominee may vary according to the particular areas of expertise being sought as a complement to the existing composition of the Board. However, at a minimum, candidates for trustee must possess: • the highest professional and personal ethics and values; • a commitment to enhancing shareholder value; • broad experience at the policy-making level in business, government, education, technology or public interest; • an ability to provide insights and practical wisdom based on their experience and expertise; • a willingness and ability to devote adequate time and resources to diligently perform Board duties; service on other boards of public companies (in addition to the Company) should be limited to a reasonable number not to exceed three, provided that, in the case of the Chief Executive Officer, service on other boards (in addition to the Company) should not exceed two; • a reputation, both personal and professional, consistent with the image and reputation of the Company; • an ability to exercise sound judgment and to make independent analytical inquiries; and • an ability and commitment to comply with all policies of the Company applicable to Trustees. In addition to the minimum qualifications listed above, the Corporate Governance & Nominating Committee believes that there are other qualities and skills that, while not a prerequisite for nomination, should be considered when identifying potential nominees. These factors include: 26

CORPORATE GOVERNANCE & NOMINATING COMMITTEE • whether the person possesses specific expertise and familiarity with general issues affecting our business; • whether the person’s nomination and election would enable the Board to have a member that qualifies as an “audit committee financial expert” as such term is defined by the SEC; • whether the person would qualify as an “independent” Trustee under the listing standards and other independence requirements of the NYSE and our corporate governance guidelines; • the importance of continuity of the existing composition of the Board; and • the importance of a diversified Board membership, in terms of both the individuals involved and their various experiences and areas of expertise. The Corporate Governance & Nominating Committee will seek to identify Trustee candidates based on input provided by a number of sources, including (a) Corporate Governance & Nominating Committee members, (b) other members of the Board, (c) the internal search process of the corporate secretary, (d) our shareholders, and (e) other interested parties. The Corporate Governance & Nominating Committee also has the authority to consult with or retain advisors or search firms to assist in the identification of qualified Trustee candidates, and does so from time to time. As part of the identification process, the Corporate Governance & Nominating Committee determines the optimal size of the Board, assessing the future needs based on anticipated Trustee vacancies, the value of specific industry expertise and the willingness of existing Trustees to continue to serve as Trustees if re-nominated. Once a Trustee candidate has been identified, the Corporate Governance & Nominating Committee will evaluate the candidate in light of his or her qualifications and credentials, and any additional factors that it deems necessary or appropriate, including, without limitation, the completion of a D&O Questionnaire and a background check. Existing Trustees who are being considered for re-nomination are re-evaluated as part of the Corporate Governance & Nominating Committee’s process of recommending Trustee candidates. The Corporate Governance & Nominating Committee will consider all persons recommended by shareholders in the same manner as all other Trustee candidates provided that such recommendations are submitted in accordance with the procedures set forth in the Bylaws. For more information see the section entitled “Other Matters — Shareholder Proposals and Nominations for the 2025 Annual Meeting” below. After completing the identification and evaluation process described above, the Corporate Governance & Nominating Committee recommends to the Board the nomination of a number of candidates equal to the number of Trustees expected to be elected at the next annual meeting of shareholders. The Board selects the Trustee nominees for shareholders to consider and vote upon at the annual meeting. Our Bylaws provide for a proxy access right, which enables eligible shareholders to include their nominees for election as Trustees in our proxy materials for annual meetings. The proxy access provisions of our Bylaws permit up to 20 shareholders owning at least three percent of our common shares continuously for at least three years to nominate the greater of (i) two Trustees or (ii) 20 percent of the number of Trustees in office as of the last day on which a proxy access notice of a nomination may be delivered in accordance with the Bylaws. During 2023, the Corporate Governance & Nominating Committee consisted of Mr. Bussani (Chair), Ms. Dowling and Messrs. Fain and Lynch. Each member of the Corporate Governance & Nominating Committee is independent under the listing standards and other independence requirements of the NYSE. 27

NAMED EXECUTIVE OFFICERS Set forth below is background information on each of our NEOs other than Mr. Marr, whose background is described above under “Details of Trustee Nominees.” Timothy M. Martin Age: 53 Chief Financial Officer and Treasurer Mr. Martin has served as our Chief Financial Officer and Treasurer since 2008. Mr. Martin served as our Senior Vice President and Chief Accounting Officer from 2006 to 2008. He previously was employed by Brandywine Realty Trust from 1997 to 2006, serving in various roles including Principal Financial Officer, Chief Accounting Officer and Director of Financial Analysis. Prior to joining Brandywine, Mr. Martin served as a member of the audit staff of Arthur Andersen, LLP’s Philadelphia office, specializing in real estate. Joel D. Keaton Age: 54 Chief Operating Officer Mr. Keaton has served as our Chief Operating Officer since 2020. From 2014 to 2019, he served as our Senior Vice President of Operations. Mr. Keaton joined the Company in 2010 as Director of Revenue Management and in 2011 was promoted to Vice President of Marketing. Prior to joining the Company, Mr. Keaton served as Vice President of Operations at United Stor-All Management from 2006 to 2010. From 1993 to 2006, Mr. Keaton worked in various operations-related roles at Storage USA and its successor, Extra Space Storage. Jeffrey P. Foster Age: 54 Chief Legal Officer and Secretary Mr. Foster has served as our Chief Legal Officer and Secretary since 2009. From 2003 to 2009, he served as Senior Vice President of Real Estate Transactions and Associate General Counsel of Gramercy Property Trust. Prior to joining Gramercy Property Trust, Mr. Foster was an associate with Morgan, Lewis & Bockius LLP from 1999 to 2003. Jennifer L. Schulte Age: 52 Chief Human Resources Officer Ms. Schulte has served as our Chief Human Resources Officer since September 2020. Prior to joining CubeSmart, she served as the Americas region Vice President, Human Resources for Lavazza Group. She previously was employed by Mars, Inc. from 2001-2018, serving in various roles including Global Vice President, Human Resources for Mars Drinks. From 1993 to 2001, Ms. Schulte held several financial management roles at Bank of America, Sprint and Cigna. Average NEO Experience 14 Years with CubeSmart 19 Years in self storage 18 Years at publicly traded REITs 28

NAMED EXECUTIVE OFFICER COMPENSATION Compensation Discussion & Analysis This Compensation Discussion & Analysis describes our executive compensation programs, including the oversight of such programs by our Compensation Committee and the rationale and processes used to determine the compensation for the Company’s NEOs and provides a detailed description of those programs. This Compensation Discussion & Analysis, which may include forward-looking statements, should be read together with the compensation tables and related disclosures that follow this section. Overview The Compensation Committee sets corporate goals and objectives with respect to executive compensation, evaluates performance against those goals and objectives, and determines the appropriate level and structure of executive compensation based on its evaluation. In carrying out these duties during 2023, the Compensation Committee considered analyses prepared by its independent compensation consultant FW Cook. Philosophy and Objectives We desire to build and maintain a superior executive management team to forge our business strategy and lead us to profitable growth. We believe that success in accomplishing these goals will, in part, depend on the effectiveness of our executive compensation programs, which are designed to compensate and reward NEOs for the achievement of corporate goals and desired business results and for their individual contributions in the execution of our business strategy. We strive for excellence in corporate and individual performance by tying a significant portion of overall executive compensation to the achievement of our corporate goals. The Compensation Committee believes that the most effective executive compensation programs are designed to reward the achievement of specific annual, long-term, and strategic goals that align executives’ interests with those of the shareholders by rewarding performance above established goals, with the ultimate objective of improving shareholder value. Executive Compensation Goals Attract and retain the best possible executive talent Link compensation to short-term and long-term performance goals Encourage superior performance for all individual NEOs 29

NAMED EXECUTIVE OFFICER COMPENSATION 2023 Executive Compensation Program The Compensation Committee engaged FW Cook, an independent compensation consultant, to review our existing compensation and benefits program, analyze competitive market compensation practices, and make recommendations on our 2023 executive compensation program to achieve the objectives described above. Representatives of FW Cook were present at several of the Compensation Committee’s meetings and also met with the Compensation Committee in executive session, where no members of management were present. As part of its process of designing and evaluating the competitiveness of our compensation program, the Compensation Committee, after considering the input of FW Cook, identified a peer group of companies for purposes of competitive market comparisons. This peer group is comprised of equity REITs with comparable market capitalizations and who, therefore, compete for executive talent with us. The 2023 peer group, detailed below, includes 19 REITs with a median equity market capitalization, as of June 1, 2023, of $10.75 billion. The Compensation Committee reviewed and discussed the compensation data compiled by FW Cook related to this peer group. After considering this data, the desire to retain a superior executive management team, and the tenure and caliber of our NEOs, the Compensation Committee established the 2023 compensation program. 30

NAMED EXECUTIVE OFFICER COMPENSATION Our 2023 peer group is identical to our 2022 peer group, except for American Campus Communities, which was removed from our peer group because it is no longer a public company. Listed below are the companies that comprised our 2023 peer group: 2023 Company Peers American Homes 4 Rent Federal Realty Investment Trust Apartment Income REIT Highwoods Properties Apple Hospitality REIT Life Storage (1) Brandywine Realty Mid-America Apartment Communities Brixmor Property Group SBA Communications Camden Property Trust Sun Communities Choice Hotels International Tanger Inc. COPT Defense Properties UDR Equity LifeStyle Properties VICI Properties Extra Space (1) Acquired by Extra Space on July 20, 2023. The Compensation Committee uses data provided by FW Cook to assess industry practices overall and to provide comparisons regarding individual positions. The Compensation Committee has generally focused on the median of the peer group as an approximate target in setting overall target compensation amounts for each NEO, though it also applies its own judgment after consulting with FW Cook and considering the specific responsibilities, tenure, and attributes of each of our NEOs. The decisions of the Compensation Committee are not mandated by any specific correlation to the peer group, rather, they reflect the Compensation Committee’s views of competitive practice, individual role and performance, our operating performance, and internal equity among our executive management team. 31 In considering executive compensation decisions, the Compensation Committee also reviews tally sheets prepared for each NEO. The tally sheets present the dollar amounts of each component of compensation awarded to the NEOs, including salary, annual incentive awards, outstanding equity awards, contributions to retirement plans, potential payments under the CubeSmart Executive Severance Plan (the “Severance Plan”), perquisites, and other benefits. The overall purpose of the tally sheets is to bring together, in one place, all of the elements of actual and potential future compensation in certain circumstances so that the Compensation Committee may analyze both the individual elements of compensation (including the compensation mix), as well as the total amount of compensation. The Compensation Committee also considered the 94% shareholder vote in support of the Company’s executive compensation program, as reflected in the shareholders’ adoption of an advisory resolution approving the executive compensation disclosed in our 2023 proxy statement. Considering all of these factors, the Compensation Committee concluded that no changes were required to be made to the overall structure of the Company’s 2023 executive compensation program.

NAMED EXECUTIVE OFFICER COMPENSATION After evaluating the foregoing factors and in consultation with FW Cook, the Compensation Committee recommended the following compensation adjustments for our NEOs. Christopher P. Marr 2023 $ 884,000 165% $ 4,100,000 2022 $ 850,000 150% $ 4,100,000 Timothy M. Martin 2023 $ 550,000 125% $ 1,550,000 2022 $ 500,000 100% $ 1,200,000 Joel D. Keaton 2023 $ 500,000 125% $ 975,000 2022 $ 440,000 95% $ 720,000 Jeffrey P. Foster 2023 $ 484,000 100% $ 650,000 2022 $ 440,000 90% $ 550,000 Jennifer L. Schulte 2023 $ 337,000 55% $ 340,000 2022 $ 318,000 50% $ 240,000 NEO Year Salary Annual Incentive Target as % of Salary Long-Term Incentive Target Overview of Compensation Components Our executive compensation program consists of three principal components: salary, annual incentive compensation, and long-term incentive compensation. The design and objective of each component of our 2023 executive compensation is set forth below. 32

NAMED EXECUTIVE OFFICER COMPENSATION Salary Salary is the fixed component of pay and is intended to provide a base level of compensation for our NEOs. Factors considered in determining base salaries include the NEO’s scope of responsibilities, a market competitive assessment of similar roles at a peer group of real estate companies, and the performance of the individual NEO. Any increases to the base salaries of our NEOs, other than our Chief Executive Officer, are set by the Compensation Committee after discussions with, and recommendations by, our Chief Executive Officer regarding each individual’s accomplishments, areas of strength, and opportunities for development. Any increase to the salary of our Chief Executive Officer is set after each Trustee completes a performance evaluation of the Chief Executive Officer, the results of which are summarized and reviewed by the Chair of the Compensation Committee with Compensation Committee members and with the Chief Executive Officer. In addition, the Compensation Committee considers the linkage of base salaries to other elements of our compensation that are tied to salaries such as severance, change in control benefits, and annual incentive targets. After review and discussion, the Compensation Committee set the 2023 salaries of our NEOs as follows: Christopher P. Marr $ 884,000 4.0% Timothy M. Martin $ 550,000 10.0% Joel D. Keaton $ 500,000 13.6% Jeffrey P. Foster $ 484,000 10.0% Jennifer L. Schulte $ 337,000 6.0% NEO Percentage Increase over Prior Year Salary 33

NAMED EXECUTIVE OFFICER COMPENSATION Annual Incentive Annual incentive compensation enables us to align the NEOs to common goals while recognizing individual performance. In February 2023, the Compensation Committee approved a targeted annual incentive opportunity for each NEO that correlated to specific performance objectives involving financial results, execution of strategy and individual goals. The Compensation Committee also approved incentive payouts (as a percentage of the NEOs’ target annual incentive) as follows: Threshold 50%; Target 100%; and Maximum 200%. The following charts detail the performance objectives, weighting, and the actual results of each component for the 2023 annual incentive compensation: 34 (1) FFO and NOI are non-GAAP financial measures. See appendix to this proxy statement for a discussion of non-GAAP financial measures and reconciliations to the most directly comparable GAAP financial measures. (2) See next page for details.

NAMED EXECUTIVE OFFICER COMPENSATION 35 For the investments in acquisitions performance objective, and notwithstanding that investments in acquisitions were below the threshold amount, the Compensation Committee determined that such outcome was the result of management’s justified operational discipline in a challenging real estate market, and, therefore, decided to award this component of the annual incentive at Target. The Compensation Committee has not previously adjusted a performance-based component of annual incentive compensation to the target level. The Compensation Committee recognized the challenging macroeconomic environment in which management sourced and underwrote acquisition investments. In addition to the above goals, individual goals were weighted 10%. Individual goals were focused on technological enhancements, operational efficiencies and simplifications, expense management, communication improvements, workplace engagement and culture, information management and other items. The Compensation Committee determined that Messrs. Marr, Martin and Foster achieved the maximum level of their respective individual goals, resulting in a 200% payout for this component of incentive compensation, and that Mr. Keaton and Ms. Schulte achieved the target level of their respective individual goals, resulting in a 100% payout for this component of incentive compensation. Pursuant to the objectives and results detailed above, the following table details each NEO’s annual incentive target opportunity and actual payout for 2023. Christopher P. Marr $ 884,000 165% $ 1,458,600 $ 1,480,479 Timothy M. Martin $ 550,000 125% $ 687,500 $ 697,813 Joel D. Keaton $ 500,000 125% $ 625,000 $ 571,875 Jeffrey P. Foster $ 484,000 100% $ 484,000 $ 491,260 Jennifer L. Schulte $ 337,000 55% $ 185,350 $ 169,595 NEO Target Payout Actual Payout Salary Annual Incentive Target as % of Salary

NAMED EXECUTIVE OFFICER COMPENSATION Long-Term Incentive We believe that long-term incentive compensation helps to facilitate talent retention and promote alignment with shareholder interests. The components of our long-term equity incentive compensation are as follows (each representing 1/3 of the award value, with the number of shares based on the applicable accounting grant-date value): Restricted Shares vest ratably over three years beginning on the first anniversary of the date of grant. Dividends are paid on restricted shares prior to vesting. Because we are a REIT, dividends are a key component of our total shareholder return. The compensation committee believes that allowing dividends to be paid on outstanding restricted shares further promotes the alignment of NEO goals with shareholder interests. Performance Units represent the right to earn common shares. These units cliff vest and are measured on the third anniversary of the grant date. The number of common shares, if any, deliverable to award recipients depends on our total shareholder return (measured by reference to the change in our share price plus dividends) over the measurement period compared to the total shareholder return for a peer group consisting of all equity real estate investment trusts. Award recipients also receive common shares representing dividends that would have been earned during the performance period on the final number of common shares awarded. At the end of the measurement period, the number of base units then represented by the performance units will be converted into common shares, provided that our total shareholder return ranking among the peer group is at or above the 25th percentile. If our ranking is below the 25th percentile, then the conversion factor will be zero, no common shares will be awarded, and the performance units will lapse. At any ranking at or above the 25th percentile and up to and including the 50th percentile, the multiplier will be determined through a straight-line interpolation and the conversion factor would be between 50% and 100%. At any ranking above the 50th percentile and below the 75th percentile, the multiplier will be determined through a straight-line interpolation and the conversion factor would be between 100% and 200%. At any ranking at or above the 75th percentile, the multiplier is fixed at two. Thus, if our ranking places us at or above the 75th percentile, the payment will be based on the product of the award recipient’s base units multiplied by two. Stock Options vest ratably over three years beginning on the first anniversary of the date of grant. The stock options have a term of 10 years and an exercise price equal to the closing price of our common shares on the date of the grant, which is typically January 1. 36

NAMED EXECUTIVE OFFICER COMPENSATION In January 2023, the Compensation Committee awarded a target grant level for long-term incentive compensation for each NEO as follows: Christopher P. Marr $ 4,100,000 33,954 22,942 172,996 Timothy M. Martin $ 1,550,000 12,836 8,673 65,401 Joel D. Keaton $ 975,000 8,075 5,456 41,139 Jeffrey P. Foster $ 650,000 5,383 3,637 27,426 Jennifer L. Schulte $ 340,000 2,816 1,903 14,346 NEO Restricted Shares (#) Performance Units (at Target) (#) Long-term Incentive Target Stock Options Final Results of 2021 Performance Units We granted performance units in 2021 that are earned based on our relative total shareholder return on substantially the same terms as described above for the 2023 performance units. The measurement period for the performance units awarded to our NEOs on January 1, 2021 ended on December 31, 2023. Over this measurement period, our total shareholder return was in the 86th percentile for the relevant peer group, above the maximum goal. Therefore, the multiplier for these performance units was fixed at two. The following table details the target and actual achieved awards for the 2021 performance units: Christopher P. Marr 28,502 57,004 Timothy M. Martin 7,230 14,460 Joel D. Keaton 4,171 8,342 Jeffrey P. Foster 3,406 6,812 Jennifer L. Schulte 1,529 3,058 NEO Actual Achieved Award of Performance Units (1) (#) Target Award of Performance Units (#) (1) Each NEO also received shares representing the value of the dividends that would have been earned over the measurement period for the awarded performance units as follows: Mr. Marr, 6,562 shares; Mr. Martin, 1,665 shares; Mr. Keaton, 960 shares; Mr. Foster, 783 shares; and Ms. Schulte, 351 shares. 2024 Compensation Actions The Compensation Committee, taking into consideration the views of FW Cook, maintained the same peer group used in 2023 (with the exception of removing Life Storage, which was sold in 2023). FW Cook prepared compensation data from this peer group. After reviewing this data, the Compensation Committee determined that competitive adjustments should be made to our NEO compensation. These adjustments are designed to reflect the market for executive talent, the growth of the Company, and the performance and responsibilities of each NEO. 37

NAMED EXECUTIVE OFFICER COMPENSATION The table below sets forth the base and target compensation levels for 2024 and 2023 for each component of the Company’s NEO compensation program. Christopher P. Marr 2024 $ 920,000 175% $ 5,000,000 2023 $ 884,000 165% $ 4,100,000 Timothy M. Martin 2024 $ 600,000 125% $ 1,700,000 2023 $ 550,000 125% $ 1,550,000 Joel D. Keaton 2024 $ 560,000 125% $ 1,200,000 2023 $ 500,000 125% $ 975,000 Jeffrey P. Foster 2024 $ 540,000 100% $ 800,000 2023 $ 484,000 100% $ 650,000 Jennifer L. Schulte 2024 $ 380,000 55% $ 425,000 2023 $ 337,000 55% $ 340,000 NEO Year Salary Annual Incentive Target as % of Salary Long-Term Incentive Target Other Compensation Elements Deferred Compensation Benefits: The CubeSmart Executive Deferred Compensation Plan (the “Deferred Compensation Plan”) permits officers, including our NEOs, to defer receipt of all or a portion of their salary and annual incentive awards and have that deferred compensation credited to accounts until distributed in accordance with qualified employee elections. Under the Deferred Compensation Plan, we credit to each participant’s account a matching deferred compensation amount that is equal to the difference between the total matching contribution that we would have made under our 401(k) plan without regard to the limits imposed by the Internal Revenue Code of 1986, as amended (the “Code”) and the actual matching contribution that we make under the 401(k) plan. In addition, our NEOs may elect to receive restricted share units that settle later than the applicable vesting date, in lieu of restricted shares, and they may elect to defer the settlement of their performance units beyond the vesting date. Share settlement will occur on individually-elected distribution dates selected by the NEO at the time of the initial deferral election and will be in the form of one share for each deferred unit. These elections are made by the NEOs prior to the grant of such awards. NEOs receive dividend equivalents (paid as cash) on vested and deferred equity awards during the period of deferral. See page 46 for details. Perquisites and Personal Benefits: During 2023, consistent with Company benefit plans applicable to all employees, we provided medical coverage and life insurance equal to the lesser of the employee’s salary or $500,000. In addition, the Company provided the use of a leased vehicle or a vehicle allowance and arranged for long-term disability insurance coverage, the premium for which was paid by each of our NEOs and then reimbursed by the Company. While these benefits were not tied to any formal performance criteria, they were intended to serve as part of a competitive total compensation program. Additional Compensation Principles Risk Guidelines: The structure of our compensation policies and practices is designed to direct our NEOs towards key long-term goals in the areas of strategy, operations, financial performance, risk mitigation, and individual development. By focusing on the long-term achievement of corporate and personal goals, we discourage our NEOs 38

NAMED EXECUTIVE OFFICER COMPENSATION from engaging in unnecessary and excessive risk-taking. We maintain strong internal financial controls and use effective management processes for developing strategic and annual operating plans and employee development programs. As a result of our compensation policies and practices, we have concluded that we are not encouraging or creating risks that are reasonably likely to have a material adverse effect on the Company. Policy on the Grant of Equity Awards: The Board adopted a Policy Statement on the Grant of Equity Awards (the “Equity Grant Policy”) to ensure compliance with relevant rules and regulations and adherence to current corporate governance practices. The Equity Grant Policy provides that the Board has sole authority to approve equity awards to our Trustees and our NEOs. The Equity Grant Policy further provides that the grant date shall be no earlier than the date of the meeting at which the award is approved by the Board or the Compensation Committee, as the case may be. With respect to new hires, the date of the award shall be the later of the first date of employment or the date that any required approval for the grant is obtained from the Board or Compensation Committee. Under no circumstances will the grant date for any equity award be earlier than the date that the award is approved. The exercise price of option awards shall be the closing price of our common shares on the date of grant. Share Ownership Guidelines: We maintain share ownership guidelines for all of our officers to ensure that each officer maintains a material personal financial stake in the Company, aligning the interests of management with the interests of our shareholders. We expect each Company officer to acquire within five years of his or her appointment (and thereafter to maintain ownership of) common shares having a market value equal to at least: five times the annual salary for the President and Chief Executive Officer; three times the annual salary for the Chief Financial Officer, Chief Operating Officer, Chief Legal Officer, and Chief Human Resources Officer; 1.75 times the annual salary for all Senior Vice Presidents and other executive officers; and 0.75 times the annual salary for all other officers. All shares directly owned and all vested restricted shares are considered for the share ownership guidelines. Unvested restricted shares and performance units, as well as unexercised options, are not considered for the guidelines. The Board annually reviews progress toward achieving these ownership levels for the NEOs. In February 2023, the Board reviewed achievement levels and determined that each of our NEOs with the requisite years of service met or exceeded the applicable ownership levels. Compensation Recovery: Effective December 1, 2023, we adopted a compensation recovery policy (the “Clawback Policy”), in compliance with the SEC’s adoption of final rules related to clawbacks under the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) and applicable NYSE listing standards. The Clawback Policy requires each “Covered Executive” (as defined in the Clawback Policy), including each NEO, to reimburse the Company for annual or long-term incentive compensation paid, earned, or granted to the Covered Executive based on the achievement of financial results in the three completed fiscal years immediately before the date upon which we make a financial restatement due to our material noncompliance with any financial reporting requirement under the securities laws, to the extent that the amount of the annual or long-term incentive compensation is greater than what the Covered Executive would have received based on the restated financial results. Reimbursement of these amounts is required, regardless of whether the Covered Executive was responsible for the restatement, with only limited exceptions. The requirements of the Clawback Policy are incorporated into our incentive compensation programs, and each Covered Executive is required to acknowledge the applicability of the Clawback Policy to the Covered Executive’s incentive compensation awards received after the Clawback Policy’s effective date. Hedging and Pledging Prohibitions: Our NEOs and Trustees, as well as all employees with the title of Director or above (inclusive of Divisional and Senior Divisional Vice Presidents) are prohibited from hedging their ownership or offsetting any decline in the market value of our shares, including by trading in publicly-traded options, puts, calls and other derivative instruments related to our shares. They are also prohibited from pledging Company securities. Retirement Provisions for Equity Incentive Compensation: The equity award agreements for our NEOs provide for the continued vesting of awards in the event of retirement after reaching the age of 60 and having completed 10 years of service with the Company. None of our NEOs currently qualify for this retirement provision. 39

NAMED EXECUTIVE OFFICER COMPENSATION Compensation Committee Report The Compensation Committee reviewed and discussed with management the Compensation Discussion & Analysis contained in this proxy statement. Based on this review and discussion, the Compensation Committee recommended to the Board that the Compensation Discussion & Analysis be included in this proxy statement for filing with the SEC. Respectfully submitted, The Compensation Committee of the Board of Trustees Dorothy Dowling (Chair) Piero Bussani John F. Remondi Jeffrey F. Rogatz Notwithstanding anything to the contrary set forth in any of our previous or future filings under the Securities Act or the Exchange Act that might incorporate this proxy statement or future filings with the SEC, in whole or in part, the above report shall not be deemed to be “soliciting material” or “filed” with the SEC and shall not be deemed to be incorporated by reference into any such filing. CEO Pay Ratio As required by Section 953(b) of the Dodd-Frank Act and Item 402(u) of Regulation S-K, we are providing the following information for the year ended December 31, 2023: • The median of the annual total compensation of all employees of our company (other than our Chief Executive Officer), was $34,996; and the annual total compensation of Mr. Marr, our Chief Executive Officer was $6,719,684. • Based on this information for 2023, the ratio of the annual total compensation of our Chief Executive Officer to the median of the annual total compensation of all employees was 192 to 1. We completed the following steps to identify the median of the annual total compensation of all our employees and to determine the annual total compensation of our median employee and Chief Executive Officer: • We determined our employee population as of December 31, 2023, which was 3,040, including all full-time, part-time, temporary or seasonal employees employed on that date. • To find the median of the annual total compensation of our employees (other than our Chief Executive Officer), we used wages from our payroll records as reported to the Internal Revenue Service on Form W-2 for fiscal 2023. In making this determination, we annualized compensation for full-time and part-time permanent employees who were employed on December 31, 2023, but did not work for us the entire year. No full-time equivalent adjustments were made for part-time employees. • We identified our median employee using this compensation measure and methodology, which was consistently applied to all our employees included in the calculation. • After identifying the median employee, we added together all of the elements of such employee’s compensation for 2023 in accordance with the requirements of Item 402(c)(2)(x) of Regulation S-K, resulting in annual total compensation of $34,996. With respect to the annual total compensation of our Chief Executive Officer, we used the amount reported in the “Total” column of our 2023 Summary Compensation Table appearing on page 41 of this proxy statement, which is also in accordance with the requirements of Item 402(c)(2)(x). 40

NAMED EXECUTIVE OFFICER COMPENSATION 41 Summary Compensation Table The following table sets forth the summary compensation of the NEOs of the Company for the years ended December 31, 2023, 2022, and 2021: Christopher P. Marr 2023 $ 884,000 $ 2,733,303 $ 1,366,668 $ 1,480,479 $ 255,234 $ 6,719,684 2022 $ 850,000 $ 2,733,335 $ 1,366,663 $ 2,097,375 $ 241,303 $ 7,288,676 2021 $ 800,000 $ 2,733,354 $ 1,366,665 $ 2,191,200 $ 226,439 $ 7,317,658 Timothy M. Martin 2023 $ 550,000 $ 1,033,300 $ 516,668 $ 697,813 $ 127,089 $ 2,924,870 2022 $ 500,000 $ 800,010 $ 399,999 $ 822,500 $ 128,002 $ 2,650,511 2021 $ 480,000 $ 693,332 $ 346,665 $ 876,480 $ 113,002 $ 2,509,479 Joel D. Keaton 2023 $ 500,000 $ 650,033 $ 324,998 $ 571,875 $ 93,367 $ 2,140,273 2022 $ 440,000 $ 479,967 $ 239,999 $ 687,610 $ 101,088 $ 1,948,664 2021 $ 425,000 $ 400,013 $ 199,999 $ 698,445 $ 86,525 $ 1,809,982 Jeffrey P. Foster 2023 $ 484,000 $ 433,322 $ 216,665 $ 491,260 $ 92,418 $ 1,717,665 2022 $ 440,000 $ 366,619 $ 183,337 $ 661,320 $ 102,922 $ 1,754,198 2021 $ 415,000 $ 326,662 $ 163,332 $ 682,011 $ 82,032 $ 1,669,037 Jennifer L. Schulte (4) 2023 $ 337,000 $ 226,706 $ 113,333 $ 169,595 $ 64,576 $ 911,210 Chief Legal Officer and Secretary Chief Human Resources Officer Chief Operating Officer Total Chief Financial Officer and Treasurer President and Chief Executive Officer Non-Equity Incentive Plan Compensation (2) All Other Compensation (3) Option Awards NEO Year Salary (1) Share Awards (1) (1) The amounts reported in the Share Awards and Option Awards columns represent the grant-date fair value of restricted shares, performance units and option awards granted to the NEOs under our equity incentive plans. Such amounts were calculated in accordance with the provisions of FASB ASC Topic 718. Pursuant to SEC rules, the amounts shown exclude the impact of estimated forfeitures related to service-based vesting conditions. Please refer to Note 16, “Share-Based Compensation Plans,” in the Notes to Consolidated Financial Statements included in our most recent Annual Report on Form 10-K for the year ended December 31, 2023 filed with the SEC on February 29, 2024 for the relevant assumptions used to determine the grant-date fair value of our share and option awards. The value of each of the awards granted to the NEOs in 2023 is listed in the table captioned “Grants of Plan-Based Awards” appearing on page 43 of this proxy statement. (2) Represents annual incentive cash compensation. For a detailed description of the annual incentive awards see “Annual Incentive” in the section of this proxy statement entitled “Compensation Discussion & Analysis.” (3) The amounts reported in the All Other Compensation column represent, for each NEO, the sum of (a) the amounts contributed by the Company to the CubeSmart, L.P. 401(k) Retirement Savings Plan; (b) the amounts contributed by the Company to the Deferred Compensation Plan; (c) personal use of a leased vehicle or a vehicle allowance; (d) the dollar value of dividends on unvested restricted shares; (e) the cost to the Company for long-term disability insurance; and (f) medical costs above those available to all employees. The aggregate incremental cost to the Company for NEO vehicle usage is based on either: (a) the actual lease cost incurred, plus expenses for fuel, maintenance and insurance, or (b) the amount of the vehicle allowance. In calculating vehicle usage, we

NAMED EXECUTIVE OFFICER COMPENSATION 42 disregarded business usage and assumed 100 percent personal usage. The dollar value of dividends on vested and deferred share units is not contemplated in the amounts above and are disclosed in the Nonqualified Deferred Compensation table below. Listed in the table below are the amounts reported in this column for 2023. Christopher P. Marr $ 9,250 $ 116,408 $ 4,316 $ 124,495 $ 765 Timothy M. Martin $ 9,250 $ 53,366 $ 22,626 $ 41,082 $ 765 Joel D. Keaton $ 9,250 $ 41,775 $ 16,354 $ 25,223 $ 765 Jeffrey P. Foster $ 9,250 $ 43,041 $ 21,428 $ 17,934 $ 765 Jennifer L. Schulte $ 9,250 $ 22,342 $ 22,280 $ 9,939 $ 765 Long-Term Disability Insurance NEO Vehicle Usage Company Match in 401(k) Plan Dividends on Unvested Restricted Shares Company Contributions to Deferred Compensation Plan (4) Ms. Schulte was not an NEO before 2023.

NAMED EXECUTIVE OFFICER COMPENSATION Grants of Plan-Based Awards The following table and narrative provide information about plan-based awards granted during 2023 to the NEOs. These awards consist of annual cash incentives, restricted shares, performance units, and options. The Board approved these awards on December 7, 2022. NEO/Award Grant Date Threshold Target Max Threshold Target Max Cash Incentive 729,300 1,458,600 2,917,200 Restricted Shares 1/1/2023 33,954 1,366,648 Performance Units 1/1/2023 11,471 22,942 45,884 1,366,655 Stock Options 1/1/2023 172,996 40.25 1,366,668 Cash Incentive 343,750 687,500 1,375,000 Restricted Shares 1/1/2023 12,836 516,649 Performance Units 1/1/2023 4,337 8,673 17,346 516,651 Stock Options 1/1/2023 65,401 40.25 516,668 Cash Incentive 312,500 625,000 1,250,000 Restricted Shares 1/1/2023 8,075 325,019 Performance Units 1/1/2023 2,728 5,456 10,912 325,014 Stock Options 1/1/2023 41,139 40.25 324,998 Cash Incentive 242,000 484,000 968,000 Restricted Shares 1/1/2023 5,383 216,666 Performance Units 1/1/2023 1,819 3,637 7,274 216,656 Stock Options 1/1/2023 27,426 40.25 216,665 Cash Incentive 92,675 185,350 370,700 Restricted Shares 1/1/2023 2,816 113,344 Performance Units 1/1/2023 952 1,903 3,806 113,362 Stock Options 1/1/2023 14,346 40.25 113,333 Jennifer L. Schulte All Other Share Awards (#) All Other Option Awards: Number of Securities Underlying Options (#) Grant Date Fair Value of Share and Option Awards ($) (3) Estimated Future Payouts Under Non-Equity Incentive Plan Awards ($) (1) Estimated Future Payouts Under Equity Incentive Plan Awards (#) (1) (2) Exercise or Base Price of Option Awards ($) Timothy M. Martin Joel D. Keaton Jeffrey P. Foster Christopher P. Marr (1) Listed in these columns are the potential awards at each stated level of performance for the annual incentive compensation under our executive compensation program. For a detailed description of the annual incentive 43

NAMED EXECUTIVE OFFICER COMPENSATION 1/1/2023 — 172,996 40.25 12/31/2032 33,954 1,573,768 45,884 2,126,723 1/1/2022 51,592 103,183 56.91 12/31/2031 16,010 742,064 32,848 1,522,505 1/1/2021 198,068 99,033 33.61 12/31/2030 13,554 628,228 57,004 2,642,135 1/1/2020 300,546 — 31.48 12/31/2029 1/1/2019 157,480 — 28.69 12/31/2028 1/23/2018 107,181 — 27.78 1/22/2028 1/23/2017 108,932 — 26.30 1/22/2027 1/22/2016 87,604 — 30.32 1/21/2026 1/23/2015 74,906 — 25.00 1/22/2025 1/1/2023 — 65,401 40.25 12/31/2032 12,836 594,949 17,346 803,987 1/1/2022 15,100 30,200 56.91 12/31/2031 4,686 217,196 9,614 445,609 1/1/2021 50,242 25,120 33.61 12/31/2030 3,438 159,351 14,460 670,221 1/1/2020 75,592 — 31.48 12/31/2029 1/1/2019 41,995 — 28.69 12/31/2028 1/23/2018 36,174 — 27.78 1/22/2028 1/23/2017 36,765 — 26.30 1/22/2027 1/22/2016 29,566 — 30.32 1/21/2026 1/23/2015 30,765 — 25.00 1/22/2025 Christopher P. Marr Timothy M. Martin NEO/ Grant Date Number of Securities Underlying Options Unexercisable (#) (1) Number of Shares That Have Not Vested (#) (2) Equity Incentive Plan Awards: Number of Unearned Shares That Have Not Vested ($) (4) Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares That Have Not Vested ($) (3) Option Awards Share Awards Number of Securities Underlying Options Exercisable (#) Option Exercise Price ($) Option Expiration Date Market Value of Shares That Have Not Vested ($) (3) 44 awards see “Annual Incentive” in the section of this proxy statement entitled “Compensation Discussion & Analysis.” The “Threshold” column represents the minimum amount payable when threshold performance is met. The “Target” column represents the amount payable if the specified performance targets are reached. The “Max” column represents the maximum payment possible. See the “Summary Compensation Table” for the actual amounts paid to each NEO for the 2023 annual cash incentive compensation. (2) These columns represent the potential number of shares that can be earned under the 2023 performance units, which have a performance period ending on December 31, 2025. (3) This column reflects the grant-date fair value of the equity awards in accordance with FASB ASC Topic 718 but excludes forfeiture assumptions related to service-based vesting conditions in accordance with SEC rules. Outstanding Equity Awards The following table sets forth outstanding equity awards held by NEOs as of December 31, 2023.

1/1/2023 — 41,139 40.25 12/31/2032 8,075 374,276 10,912 505,771 1/1/2022 9,060 18,120 56.91 12/31/2031 2,811 130,290 5,768 267,347 1/1/2021 28,986 14,492 33.61 12/31/2030 1,983 91,912 8,342 386,652 1/1/2020 45,537 — 31.48 12/31/2029 1/1/2019 24,147 — 28.69 12/31/2028 1/23/2018 23,312 — 27.78 1/22/2028 1/23/2017 20,969 — 26.30 1/22/2027 1/22/2016 13,141 — 30.32 1/21/2026 1/23/2015 8,026 — 25.00 1/22/2025 1/1/2023 — 27,426 40.25 12/31/2032 5,383 249,502 7,274 337,150 1/1/2022 6,921 13,842 56.91 12/31/2031 2,147 99,513 4,406 204,218 1/1/2021 23,672 11,835 33.61 12/31/2030 1,620 75,087 6,812 315,736 1/1/2020 43,260 — 31.48 12/31/2029 1/1/2019 24,147 — 28.69 12/31/2028 1/23/2018 22,776 — 27.78 1/22/2028 1/23/2017 23,148 — 26.30 1/22/2027 1/22/2016 18,616 — 30.32 1/21/2026 1/23/2015 7,739 — 25.00 1/22/2025 1/1/2023 — 14,346 40.25 12/31/2032 2,816 130,522 3,806 176,408 1/1/2022 3,020 6,040 56.91 12/31/2031 937 43,430 1,922 89,085 1/1/2021 10,628 5,314 33.61 12/31/2030 727 33,696 3,058 141,738 Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares That Have Not Vested ($) (3) Joel D. Keaton Jennifer L. Schulte NEO/ Grant Date Option Awards Share Awards Number of Securities Underlying Options Exercisable (#) Number of Securities Underlying Options Unexercisable (#) (1) Option Exercise Price ($) Option Expiration Date Number of Shares That Have Not Vested (#) (2) Market Value of Shares That Have Not Vested ($) (3) Equity Incentive Plan Awards: Number of Unearned Shares That Have Not Vested ($) (4) Jeffrey P. Foster (1) This column shows the number of unvested stock options originally awarded on the grant date indicated. All of these stock options vest and become exercisable in one-third installments on each of the first three anniversaries following the listed grant date, subject generally to the NEO’s continued employment. (2) This column shows the number of unvested shares of restricted stock originally awarded on the grant date indicated. All of these shares of restricted stock vest in one-third installments on each of the first three anniversaries following the listed grant date, subject generally to the NEO’s continued employment. (3) The market value is based on the closing price of our common shares of $46.35 on December 29, 2023 (the last trading day of the year). (4) This column shows the number of unvested performance units. Performance units vest on January 1 following the end of the performance period, after adjustment for performance results and subject generally to the NEO’s continued employment. For the 2021 performance units, the amount is based on actual performance NAMED EXECUTIVE OFFICER COMPENSATION 45

NAMED EXECUTIVE OFFICER COMPENSATION 46 results as discussed in the Compensation Discussion & Analysis (at 200% of target). Based on performance through December 31, 2023, the 2022 performance units and the 2023 performance units are shown assuming maximum (at 200% of target) performance. Shares Vested and Options Exercised The following table sets forth the value realized upon vesting of share awards and option exercises for each NEO for the year ended December 31, 2023. Christopher P. Marr 93,875 $ 3,778,469 58,005 $ 1,775,309 Timothy M. Martin 23,969 $ 964,752 42,537 $ 1,284,528 Joel D. Keaton 14,346 $ 577,427 — — Jeffrey P. Foster 13,102 $ 527,356 15,000 $ 300,750 Jennifer L. Schulte 1,984 $ 80,045 — — NEO Share Awards (1) Option Awards Value Realized on Vesting Value Realized on Exercise Number of Shares Acquired on Vesting Number of Shares Acquired on Exercise (1) The value realized upon vesting includes the value of share awards that became vested during the year but were deferred under the equity incentive plan. See "Nonqualified Deferred Compensation" below for additional details. Nonqualified Deferred Compensation Deferrals of Salary/Bonus Our NEOs are eligible to participate in the Deferred Compensation Plan. Under the plan, the NEOs can defer all or a portion of salary and/or bonus (including annual incentives) and have such amounts credited to a retirement distribution account and/or separate in-service distribution accounts. We provide a matching deferred compensation amount that is equal to the difference between the total matching contribution that the NEO would have received under our 401(k) plan without regard to the limitations imposed pursuant to Sections 402(g), 415 and 417 of the Code and the actual matching contribution that the NEO receives under the 401(k) plan, provided that the NEO has made the maximum elective deferrals to the 401(k) plan. The Compensation Committee may, in its discretion, approve an additional credit to a participant’s account as non-elective deferred compensation. Each distribution account is credited with the returns of the investment options selected by the NEOs, which include investment options that are available in our 401(k) plan, or such other investment funds as the Compensation Committee may designate from time to time. Elections to defer compensation must be made no later than the close of the preceding taxable year and are irrevocable as of the first day of the plan year to which it relates, except that (i) in the case of a hardship distribution, the election may be canceled for the remainder of the plan year, and (ii) a participant who has elected a lump sum distribution from the retirement distribution account may make a subsequent election to delay commencement of payment of such amount for a period of five years from the date on which such payment would otherwise have been made. In the case of any performance-based compensation for services performed over a period of 12 months, an election to defer must be made no later than six months before the end of the performance period. Upon retirement, based on a participant’s elections, balances in the retirement distribution account will be made in a lump sum or in annual installments over 5, 10, or 15 years. Upon termination of employment other than retirement or death, benefits in the retirement distribution account will be distributed in a lump sum 60 days following separation from service. Distributions from the in-service account will be made in one lump sum or in annual installments over

NAMED EXECUTIVE OFFICER COMPENSATION two, three, four, or five years, except that participants may not elect distribution of compensation earned in a plan year that is less than two years prior to the plan year elected for distribution. In the event of death prior to commencement of distribution from either a retirement distribution account or an in-service distribution account, benefits under the plan shall be payable to a participant’s beneficiary either in a lump sum or in the manner elected by the participant at the time the deferral election was made. Deferrals of Equity Awards As permitted by our equity incentive plan, NEOs may elect to receive restricted share units that settle later than the applicable vesting date, in lieu of restricted shares and performance units. NEOs may elect to defer the settlement of their restricted share units beyond the applicable vesting date. Share settlement will occur on individually-elected distribution dates selected by the NEO at the time of the initial deferral election and will be in the form of one share for each deferred unit. These elections are made by the NEOs prior to the grant of such awards. NEOs receive dividend equivalents (paid in cash) on vested and deferred equity awards during the period of deferral. The following table details the activity related to nonqualified deferred compensation for the year ended December 31, 2023: Christopher P. Marr Salary/Bonus — $ 419,475 — $ 116,408 $ 1,534,301 — $ 9,063,981 Equity Awards — — $ 3,778,469 — $ 3,146,390 ($ 765,127) $ 18,093,697 Timothy M. Martin Salary/Bonus $ 244,469 $ 246,750 — $ 53,366 $ 1,075,858 — $ 6,450,315 Equity Awards — — $ 964,752 — $ 920,379 ($ 223,814) $ 5,292,752 Joel D. Keaton Salary/Bonus $ 172,683 $ 206,283 — $ 41,775 $ 197,475 — $ 1,637,709 Equity Awards — — $ 520,835 — $ 207,207 ($ 50,388) $ 1,191,566 Jeffrey P. Foster Salary/Bonus $ 43,684 $ 52,906 — $ 43,041 $ 266,320 ($ 125,714) $ 1,722,973 Equity Awards — — $ 527,356 — $ 502,195 ($ 122,122) $ 2,887,930 Jennifer L. Schulte Salary/Bonus $ 18,144 $ 20,352 — $ 22,342 $ 21,523 — $ 189,055 Equity Awards — — — — — — — NEO / Deferral Type Aggregate Balance at December 31, 2023 (7) Executive Contributions (Salary) (1) Company Contributions (4) Aggregate Earnings (5) Aggregate Withdrawals/ Distributions (6) Executive Contributions (Bonus) (2) Executive Contributions (Equity) (3) (1) Included in the “Salary” column for 2023 of the table captioned “Summary Compensation Table” on page 41. (2) Included in the “Non-Equity Incentive Plan Compensation” column for 2022 of the table captioned “Summary Compensation Table” on page 41. (3) Represents deferred equity awards that vested during the year ended December 31, 2023. (4) Included in the “All Other Compensation” column for 2023 of the table captioned “Summary Compensation Table” on page 41. (5) For both salary/bonus and equity awards, represents change in fair market value during the year of the plan 47

holdings. For equity awards, also represents dividend equivalents (paid in cash) on deferred and vested equity awards. (6) For equity awards, includes payment of dividend equivalents described in the previous footnote. (7) The following details the amounts in the “Aggregate Balance at December 31, 2023” column related to deferrals of salary/bonus and equity awards that are reported for the indicated years on the Summary Compensation Table. This table represents amounts originally contributed and does not include investment gains or losses after the date of contribution (note that Ms. Schulte was not an NEO before 2023). Christopher P. Marr $ 116,408 $ 963,582 $ 1,413,362 Timothy M. Martin $ 297,835 $ 630,236 $ 703,254 Joel D. Keaton $ 214,458 $ 385,844 $ 489,114 Jeffrey P. Foster $ 86,725 $ 187,952 $ 213,454 Jennifer L. Schulte $ 40,486 NEO Amount Reported on Summary Compensation Table for 2023 Amount Reported on Summary Compensation Table for 2022 Amount Reported on Summary Compensation Table for 2021 Severance Plan and Potential Payments Upon Termination or Change in Control The Severance Plan provides for certain severance benefits to our NEOs on account of an involuntary termination, including if we terminate the employee without “cause” (as defined in the Severance Plan) or on account of the employee’s disability, a termination by the employee for “good reason” (as defined in the Severance Plan), or a termination on account of the employee’s death. Involuntary Termination Not in Connection with a Change in Control If we terminate the employee without “cause,” or if the employee terminates for “good reason,” in either case at least three months prior to a “change of control” (as defined in our Amended and Restated 2007 Equity Incentive Plan) or more than two years following a change of control, the terminated employee will be entitled to: • Accrued but unpaid compensation and benefits through the termination date, including (i) accrued but unpaid base salary, (ii) any earned but unpaid annual incentive compensation for the preceding year, (iii) accrued but unused paid time off and (iv) reimbursement of business expenses incurred in accordance with our policy; • For Mr. Marr, installment payments in accordance with our normal payroll practices over two years equal to two times the sum of (i) base salary and (ii) average annual incentive earned over a period of up to two years preceding the termination of employment (or if greater, his target annual incentive for the year of termination), and, for all other participants, installment payments in accordance with our normal payroll practices over 18 months equal to 1.5 times the sum of (i) base salary and (ii) average annual incentive earned by the employee over a period up to two years preceding the termination of employment (or if greater, the employee’s target annual incentive for the year of termination); • A lump-sum payment equal to the full cost of continuing the employee’s health and welfare benefits for 24 months plus an additional amount, as is necessary, to reimburse the employee for the taxes incurred in respect of such payment; • A lump-sum pro-rata annual incentive for the year of termination based on actual performance and the number of days that the employee was employed during that year; and • Continued vesting of time-based equity awards in accordance with the terms of the applicable awards and pro-rata NAMED EXECUTIVE OFFICER COMPENSATION 48

vesting of performance-based awards based on actual performance during the performance period and the number of days that the employee was employed during the performance period. Termination Due to Death or Disability If the employee’s termination is on account of death or disability other than during the Change in Control Protection Period (as defined below), the employee will be entitled to (i) a lump-sum pro-rata annual incentive for the year of termination based on actual performance and the number of days that the employee was employed during that year and (ii) full acceleration and vesting of the employee’s time-based and performance-based awards (based on target performance). Change in Control Severance If we terminate the employee without cause, or the employee terminates for good reason, in either case during the period commencing three months prior to a change of control and ending two years following a change of control (the “Change in Control Protection Period”), the terminated employee is entitled to receive the payments and benefits described above, except that (i) Mr. Marr is entitled to three times the sum of (x) the greater of his base salary on the date of termination and his base salary on the date of the change in control and (y) his average annual incentive compensation earned over a period of up to two years preceding termination of employment (or if greater, his target annual incentive for the year of termination), which amount will be paid in a lump sum (rather than installments), (ii) Mr. Martin and all other eligible employees designated as Tier II employees are entitled to 2.5 times the sum of (x) the greater of the employee’s base salary on the date of termination and the employee’s base salary on the date of the change in control and (y) the employee’s average annual incentive compensation earned by the employee over a period of up to two years preceding termination of employment (or if greater, the employee’s target annual incentive for the year of termination), which will be paid in a lump sum (rather than installments), (iii) Mr. Foster, Mr. Keaton, Ms. Schulte and all other eligible employees designated as Tier III employees are entitled to two times the sum of (x) the greater of the employee’s base salary on the date of termination and the employee’s base salary on the date of the change in control and (y) the employee’s average annual incentive compensation earned by the employee over a period of up to two years preceding termination of employment (or if greater, the employee’s target annual incentive for the year of termination), which will be paid in a lump sum (rather than installments), (iv) the pro rata annual incentive for the year of termination will be based on the greater of actual performance for such year and the employee’s target annual incentive for such year, and (v) the employee is entitled to an vehicle allowance for 24 months. In the event of a severance-eligible termination within the Change in Control Protection Period, but prior to the change in control, such employee’s then-outstanding equity awards will remain outstanding through the consummation of the change in control, and receive the same treatment as if such employee were employed as of immediately prior to the change in control (as described below). If an employee’s employment termination due to death or disability occurs during the Change in Control Protection Period, the employee will be entitled to the same benefits to which such employee would have been entitled had such termination otherwise constituted a severance-eligible termination under the Severance Plan. Change in Control Treatment of Equity Awards The Severance Plan provides for the following treatment of equity awards held by participants, including our NEOs, as of immediately prior to a change in control, regardless of whether employment terminates: (x) all time-vested equity awards held by each employee will vest in full, and all performance-vested equity awards held by each employee will vest at the greater of target and actual performance levels, (y) all equity awards subject to exercise will be deemed exercised on a net-exercise basis unless the employee elects for such awards to remain outstanding and unexercised following such change in control, and if the employee so elects, we will cause the surviving corporation or successor or affiliate to assume the awards or grant new awards in substitution therefor, and (z) each equity award continued or assumed by, or substituted for, to the extent subject to exercise, will remain outstanding and exercisable through the NAMED EXECUTIVE OFFICER COMPENSATION 49

10th anniversary of the original grant date of such award following the employee’s termination. Other Terms and Conditions In general, our obligation to provide benefits under the Severance Plan in the event of an involuntary termination by the Company without cause or by the employee for good reason is conditioned upon the employee’s providing a release of claims and complying with applicable non-competition and other post-employment restrictive covenants. If the payments and benefits otherwise payable to an employee under the Severance Plan would constitute excess parachute payments within the meaning of section 280G of the Code, then we will reduce such payments and benefits to an amount that would avoid any excise taxes under section 4999 of the Code, provided that such reduction would provide the employee with a greater net after-tax benefit than would no reduction. In no event shall any payment under the Severance Plan be grossed up for any excise taxes under Section 4999 of the Code. Estimate of Severance Benefits The following table includes an estimate of the potential payments and benefits to which Messrs. Marr, Martin, Keaton and Foster and Ms. Schulte would be entitled under the Severance Plan upon termination of employment in each of the circumstances described above. Except as otherwise set forth above, these payments would be made in a lump sum following termination. In estimating the potential payments, we have made the following general assumptions in all circumstances where applicable: • The date of termination is December 31, 2023, and the closing price of our common shares on December 29, 2023 (the last trading day of the year) was $46.35; • The annual salary at the time of termination is equal to the base salaries that were in effect as of December 31, 2023, for each executive as follows: Mr. Marr, $884,000; Mr. Martin, $550,000; Mr. Keaton, $500,000; Mr. Foster, $484,000; and Ms. Schulte, $337,000. • The bonus is equal to the average of the last two years’ annual incentive compensation paid to each executive as follows: Mr. Marr, $2,144,288; Mr. Martin, $849,490; Mr. Keaton, $693,028; Mr. Foster, $671,666; and Ms. Schulte, $205,373. • The value of restricted shares and performance units that vest upon termination is based on the closing price of our common shares at $46.35 on December 29, 2023 (the last trading day of the year); • The stock options that vest upon termination are valued at the difference between the strike price of the stock option and the market value of our common shares on December 29, 2023 (the last trading day of the year), which was $46.35; • For purposes of determining the pro-rata annual incentive compensation for the year of termination, it shall equal the target-level annual incentive compensation paid to each executive; • Four weeks of vacation are unused, accrued and unpaid; • There is no unpaid bonus for the prior year; • There is no accrued and unpaid salary; • There is no unpaid reimbursement for expenses incurred prior to the date of termination; • The continued health and welfare benefits for 24 months is $3,521 per month for each executive and the estimated payment for associated taxes on such total amount is $1,718 per month; and • The continued vehicle allowance for 24 months is $1,800 per month for each executive. NAMED EXECUTIVE OFFICER COMPENSATION 50

0 ------------------ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ---------------- 14475 CUBESMART Proxy for Annual Meeting of Shareholders on May 21, 2024 Solicited on Behalf of the Board of Trustees The undersigned hereby appoints Christopher P. Marr, Timothy M. Martin, and Jeffrey P. Foster, and each of them, as attorney-in-fact and proxy with full power of substitution to represent the undersigned and to vote all of the Common Shares of the Company, held of record by the undersigned on March 22, 2024, at the Annual Meeting of Shareholders to be held on Tuesday, May 21, 2024, at 8:00 a.m., Eastern Time, at Cubesmart, 5 Old Lancaster Road, Malvern, PA 19355, and at any adjournment or postponement thereof. Said attorney-in-fact and proxy is instructed to vote as directed on the reverse side. For more information on how to obtain directions to be able to attend the annual meeting and/or vote in person at the annual meeting please see the accompanying proxy statement or contact our Secretary at 610-535-5000. The undersigned acknowledges receipt of the accompanying Notice of Annual Meeting of Shareholders and Proxy Statement. (Continued and to be signed on the reverse side.) 1.1

Signature of Shareholder Date: Signature of Shareholder Date: Note: Please sign exactly as your name or names appear on this Proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person. To change the address on your account, please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method. INSTRUCTIONS: To withhold authority to vote for any individual nominee(s), mark “FOR ALL EXCEPT” and fill in the circle next to each nominee you wish to withhold, as shown here: JOHN SMITH 1234 MAIN STREET APT. 203 NEW YORK, NY 10038 ANNUAL MEETING OF SHAREHOLDERS OF CUBESMART May 21, 2024 INTERNET - Access “www.voteproxy.com” and follow the on-screen instructions or scan the QR code with your smartphone. Have your proxy card available when you access the web page. TELEPHONE - Call toll-free 1-800-PROXIES (1-800-776-9437) in the United States or 1-201-299-4446 from foreign countries from any touch-tone telephone and follow the instructions. Have your proxy card available when you call. Vote online/phone until 11:59 PM EST the day before the meeting. MAIL - Sign, date and mail your proxy card in the envelope provided as soon as possible. IN PERSON - You may vote your shares in person by attending the Annual Meeting. GO GREEN - e-Consent makes it easy to go paperless. With e-Consent, you can quickly access your proxy material, statements and other eligible documents online, while reducing costs, clutter and paper waste. Enroll today via https://equiniti.com/us/ast-access to enjoy online access. PROXY VOTING INSTRUCTIONS Please detach along perforated line and mail in the envelope provided IF you are not voting via telephone or the Internet. THE BOARD OF TRUSTEES RECOMMENDS A VOTE "FOR" THE ELECTION OF TRUSTEES AND "FOR" PROPOSALS 2 AND 3. PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE ------------------ ---------------- 20933000000000000000 0 052124 COMPANY NUMBER ACCOUNT NUMBER Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on May 21, 2024. The proxy statement and 2023 Annual Report to Shareholders are available at http://investors.cubesmart.com/sec-filings/documents/default.aspx 1. Election of Trustees: O Piero Bussani O Jit Kee Chin O Dorothy Dowling O John W. Fain O Jair K. Lynch O Christopher P. Marr O Deborah Ratner Salzberg O John F. Remondi O Jeffrey F. Rogatz 2. To ratify the appointment of KPMG LLP as our independent registered public accounting firm for the year ending December 31, 2024; 3. To cast an advisory vote to approve our executive compensation; To transact such other business as may properly come before the meeting or any adjournment or postponement of the meeting. In their discretion, the proxies are authorized to vote upon such other matters as may properly come before this meeting. If this proxy card is properly executed and returned to the Company, the attorney-in-fact and proxy will vote all of the undersigned's shares entitled to vote on the matters hereon as directed hereon or, where no direction is indicated, the undersigned's vote will be cast FOR each of the matters hereon. The attorney-in-fact and proxy will vote such shares as recommended by the Board of Trustees, or, if no recommendation is given, in his own discretion, with regard to any other matters as may properly come before the meeting, including any proposal to adjourn or postpone the meeting. FOR AGAINST ABSTAIN FOR ALL NOMINEES WITHHOLD AUTHORITY FOR ALL NOMINEES FOR ALL EXCEPT (See instructions below) NOMINEES: x