1.Description of Business and Basis of Presentation

Description of Business

Orion Group Holdings, Inc. and its subsidiaries (hereafter collectively referred to as the “Company” or “Orion”), is a leading specialty construction company serving the infrastructure, industrial, and building sectors, providing services both on and off the water in the continental United States, Alaska, Hawaii, Canada and the Caribbean Basin through our marine and concrete segments. We are headquartered in Houston, Texas.

Basis of Presentation

The accompanying condensed consolidated financial statements and financial information included herein have been prepared pursuant to the interim period reporting requirements of Form 10-Q. Accordingly, these financial statements do not include certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and should be read together with our Annual Report on Form 10-K for the year ended December 31, 2025.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments considered necessary for a fair presentation of the Company’s financial position, results of operations, and cash flows for the periods presented. Such adjustments are of a normal recurring nature. Interim results of operations for the three and six months ended June 30, 2026 are not necessarily indicative of the results realizable for the year ending December 31, 2026.