Orion Group Holdings, Inc. is a construction company which provides services on and off the water primarily in the continental United States, Alaska, Canada and the Caribbean Basin. The company's operating segment consists of heavy civil marine construction segment and commercial concrete segment. Heavy civil marine construction segment services includes marine transportation facility construction, marine pipeline construction, marine environmental structures, dredging of waterways, channels and ports, environmental dredging, design and specialty services. Commercial concrete segment provides turnkey concrete construction services including pour and finish, dirt work, layout, forming, rebar and mesh across the light commercial, structural and other associated business areas. Orion Group Holdings, Inc., formerly known as Orion Marine Group Inc., is headquartered in Houston, Texas.