Advisory Firms ISS And Glass Lewis Recommend Atlas Corp. Shareholders Vote "FOR" The Proposed Transaction With Poseidon Acquisition Corp. And Poseidon Merger Sub, Inc.

Atlas Corp. ("Atlas" or the "Company") (NYSE:ATCO) today announced that leading independent proxy advisory firms Institutional Shareholder Services, Inc. ("ISS") and Glass Lewis & Co. ("Glass Lewis"), recommended that Atlas shareholders vote "FOR" the previously announced Agreement and Plan of Merger among Atlas, Poseidon Acquisition Corp. and Poseidon Merger Sub, Inc. (the "Merger Agreement"), and the transactions contemplated by the Merger Agreement at the upcoming Annual Meeting of Shareholders on February 24, 2023 (the "Annual Meeting"). ISS and Glass Lewis are two leading independent proxy advisory firms which make voting recommendations to their subscribers, including institutional investors.

The Annual Meeting will be held virtually on February 24, 2023 at 2:00 p.m., London Time at www.virtualshareholdermeeting.com/ATCO2023, and all common shareholders of record as of the close of business on January 9, 2023 will be entitled to vote at the Annual Meeting. A copy of Atlas's Proxy Statement has been mailed to all Atlas shareholders of record as of the close of business on January 9, 2023 and common shareholders may vote by mailing their proxy cards or by submitting their proxy online or by telephone. The Proxy Statement has been posted to the Company's website, atlascorporation.com, and can also be accessed on the U.S. Securities and Exchange Commission's (the "SEC") website at www.sec.gov.