X0508 4 2025-11-19 0001402829 Orion Group Holdings Inc ORN 0002099433 LEDFORD ROBERT 2940 RIVERBY ROAD SUITE 400 HOUSTON TX 77020 true false false false 0 Common Stock 2025-11-19 4 A 0 5328 9.05 A 15876 D This Form 4 is being filed outside the required filing period due solely to an administrative delay in the reporting persons receipt of EDGAR filing credentials from the SEC which was due to a high volume of submissions at the time. The reporting person undertook the steps necessary to obtain such credentials promptly following the reportable transaction but did not receive them in time to make a timely filing. This Form 4 has been submitted promptly upon receipt of the required EDGAR filing credentials. /s/ E. Chipman Earle, Attorney-in-Fact 2025-12-04