五大湖区疏浚与码头有限公司2025年度报告

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934 Great Lakes Dredge & Dock Corporation Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.Yes☐No☒ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.Yes☐No☒Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirementsfor the past 90 days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).Yes☒ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or anemerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” inRule 12b-2 of the Exchange Act. ☒Accelerated filer☐Smaller reporting company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with anynew or over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared orissued itsaudit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.☐ any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes☐No☒The aggregate market value of common stock held by non-affiliates of the Registrant was $789,491,555 at June 30, 2025. The aggregate market valuewascomputed using the closing price of the common stock as of June 30, 2025 on the Nasdaq Stock Market. (For purposes of calculating the foregoing amount only,alldirectors and executive officers of the registrant have been treated as affiliates.) As of February 20, 2026, 66,780,798 shares of Registrant’s Common Stock, par value $.0001 per share, were outstanding.DOCUMENTS INCORPORATED BY REFERENCE Documents Incorporated by ReferencePortions of the Proxy Statement to be filed with the Securities and Exchange Commission in connection with the 2026 Annual Meeting of Stockholders. EXPLANATORY NOTE Great Lakes Dredge & Dock Corporation (“Great Lakes”) is filing this Amendment No. 1 (this “Amendment”) to its AnnualReport on Form 10-K for the fiscal year ended December 31, 2025 (the “2025 Form 10-K”) solely to include the Deloitte & ToucheLLP (PCAOB ID No. 34) conformed signature and inserting a comma between “Houston” and “Texas” in the document titled“Report of Independent Registered Public Accounting Firm” relating to its opinion on Great Lakes’ financial statements (the This Amendment does not reflect events occurring after the filing of the 2025 Form 10-K, does not update disclosurescontained in the 2025 Form 10-K and does not modify or amend the 2025 Form 10-K except as specifically described above.Pursuant to Rule 12b-15 of the Securities Exchange Act of 1934, as amended, this Amendment contains the complete text of eachItem that is amended and certifications of the Company’s Principal Executive Officer and Principal Financial Officer required Part II Item 8. Financial Statements and Supplementary Data. TABLE OF CONTENTS REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM CONSOLIDATED FINANCIAL STATEMENTS AS OF DECEMBER 31, 2025 AND 2024, AND FOR THE YEARSENDED DECEMBER 31, 2025, 2024 AND 2023 Consolidated Balance SheetsConsolidated Statements of OperationsConsolidated Statements of Comprehensive Income (Loss)Consolidated Statements of EquityConsolidated Statements of Cash FlowsNotes to Consolidated Financial Statements REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the shareholders and the Board of Directors of Great Lakes Dredge & Dock Corporation Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of Great Lakes Dredge & Dock Corporation and subsidiaries (the"Company") as of December 31, 2025 and 2024, the related consolidated statements of operations, comprehensive income, equity,and cash flows, for each of the three years in the period ended December 31, 2025, and the related notes