X0609 4 2026-05-01 0001402829 Orion Group Holdings Inc ORN 0001222368 FORAN MARGARET M false 2940 RIVERBY ROAD SUITE 400 HOUSTON TX 77020 true false false false 0 Common Stock 2026-05-01 4 S 0 20000 14.62 D 137541 D Common Stock 2026-05-04 4 S 0 10000 14.62 D 127541 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $14.55 per share to $14.73 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $14.60 per share to $14.70 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ E. Chipman Earle, Attorney-in-Fact 2026-05-04