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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

CURRENT REPORT

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Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

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Date of Report (Date of earliest event reported): October 29, 2025

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ORION GROUP HOLDINGS, INC.

(Exact name of Registrant as specified in its charter)

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Delaware | 1-33891 | 26-0097459
(State or other jurisdiction of incorporation) | (Commission File Number) | (IRS Employer Identification Number)

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2940 Riverby Road, Suite 400

Houston, Texas 77020

(Address of principal executive offices)

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(713) 852-6500

(Registrant's telephone number, including area code)

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)

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Title of Each Class |  | Trading Symbol(s) |  | Name of Each Exchange on Which Registered
Common stock, $0.01 par value per share | ​ | ORN | ​ | The New York Stock Exchange
Common stock, $0.01 par value per share | ​ | ORN | ​ | NYSE Texas

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Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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Emerging growth company ☐

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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Item 2.02 Results of Operations and Financial Condition.

On October 29, 2025, Orion Group Holdings, Inc. (the “Company”) held an earnings call to discuss its financial results for the third quarter ended September 30, 2025. Due to technical issues, the beginning of the earnings call may not have been accessible to all participants. Accordingly, the Company is furnishing as Exhibit 99.1 to this Current Report on Form 8-K a full transcript of the earnings call.

Item 7.01 Regulation FD Disclosure.

The information above in Item 2.02 is incorporated herein by reference. The information contained in Item 2.02 above and this Item 7.01, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed “filed” for any purpose, and shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Securities Exchange Act of 1934, as amended (the “Exchange Act”), except as expressly set forth by specific reference in such filing.

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Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No. | Description
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99.1 | Transcript of Orion Group Holdings, Inc. Third Quarter 2025 earnings conference call, held October 29, 2025.
104 | Cover Page Interactive Data File (embedded within the Inline XBRL document).

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EXHIBIT INDEX

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Exhibit No. | Description
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99.1 | Transcript of Orion Group Holdings, Inc. Third Quarter 2025 earnings conference call, held October 29, 2025.
104 | Cover Page Interactive Data File (embedded within the Inline XBRL document).

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SIGNATURE

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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​ | Orion Group Holdings, Inc.
Dated: October 29, 2025 | By: | /s/ Travis J. Boone
​ | ​ | President and Chief Executive Officer

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