Investor Presentaiton

Company Overview Orion Group Holdings, Inc., a leading specialty construction company, provides services in the Infrastructure, Industrial, and Building sectors through its marine construction segment and its concrete construction segment in the continental United States, Alaska, Canada and the Caribbean Basin. NYSE: ORN Headquarters: Houston, Texas # of Employees: ~2,500 Market Cap: ~$117 million* . ORION Average project duration: 6-9 Months Book value per share $4.79 Services Broad range of marine construction including marine transportation facility construction and dredging services Concrete construction services including light commercial, structural and industrial services Customers . • Federal, State, Municipal Governments (30% of Revenue in 2021) Private commercial and industrial clients (70% of Revenue in 2021) *as of 12/31/21 ORION Competition Marine Concrete 64% 44% 56% 36% • Highly fragmented market • Barriers to entry • Local, regional, and national competitors 2021 Revenue 2021 Backlog Financials (2021) • $601.4 MM Revenue $17.3 MM Adj. EBITDA $590.0 MM Backlog (12/31/21) 4

View entire presentation