Amendments to Code of Ethics Form 8 K

Item 5.05 Amendments to the Registrant's Code of Ethics, or Waiver of a Provision of the Code of Ethics.

On November 7, 2024, the board of directors of Great Lakes Dredge & Dock Corporation (the "Company"), upon the recommendation of the Nominating, Corporate Governance and Sustainability Committee, amended certain provisions of its Code of Business Conduct and Ethics (the "Code of Conduct"). The Code of Conduct applies to all of the Company's employees, including the Company's principal executive officer, principal financial officer, principal accounting officer, controller, and persons performing similar functions. The Company reviews the Code of Conduct periodically and amends the Code of Conduct as appropriate.

The revised Code of Conduct, among other things, modernizes references to technology tools and electronic business records, adds cybersecurity considerations and best practices, bolsters conflicts of interest policies to include organizational conflicts of interest, and clarifies and elaborates on obligations to avoid bribery and kickbacks.

The foregoing summary is subject to and qualified in its entirety by reference to the full text of the Code of Conduct, which can be found on the Company's website at www.gldd.com under "Investors - Investors - Corporate Governance - Code of Business Conduct."

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