SEC Form DEFA14A filed by Orion Group Holdings Inc. Common

Filed by the Registrant  ⌧

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◻  Preliminary proxy statement

◻  Definitive proxy statement

⌧  Definitive additional materials

◻  Soliciting material pursuant to Rule 14a-11(c) or Rule 14a-12

◻  Confidential, for Use of the Commission only (as permitted by Rule 14a-6(e)(2))

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Fee paid previously with preliminary materials.

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Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.

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Vote Virtually at the Meeting* May 15, 2025 10:00 A.M. Central Time Virtually at: www.virtualshareholdermeeting.com/ORN2025 *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number Your Vote Counts! 2025 Annual Meeting Vote by May 14, 2025 11:59 PM ET For complete information and to vote, visit www.ProxyVote.com Control # V66991-P24685 ORION GROUP HOLDINGS, INC. You invested in ORION GROUP HOLDINGS, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on May 15, 2025. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 1, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to [email protected]. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

ORION GROUP HOLDINGS, INC. 2025 Annual Meeting Vote by May 14, 2025 11:59 PM ET THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at www.ProxyVote.com V66992-P24685 Voting Items Board Recommends 1. To elect two Class III members to our Board of Directors each to serve a three-year term and until a successor is duly elected and qualified. Nominees: 1a. Austin J. Shanfelter For 1b. Mary E. Sullivan For 2. A non-binding advisory proposal to approve the compensation of our named executive officers as disclosed in the proxy statement (the “say-on-pay” vote). For 3. The ratification of the appointment of KPMG LLP as the Company’s independent registered public accounting firm for 2025. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof.