Exhibit 99.1 ORION GROUP HOLDINGS REPORTS THIRD QUARTER 2025 RESULTS AND INCREASES FISCAL YEAR 2025 GUIDANCE HOUSTON – October 28, 2025 – Orion Group Holdings, Inc. (NYSE: ORN) (the "Company", "Orion"), a leading specialty construction company, today reported its financial results for the third quarter ended September 30, 2025. Highlights for the quarter ended September 30, 2025: ($ in millions, except EPS) Management Commentary "We delivered another strong third quarter marked by top- and bottom-line resul ...