GulfMark Offshore, Inc. provides offshore marine support and transportation services primarily to the companies involved in the offshore exploration and production of oil and natural gas. The company's vessels offer various services supporting the construction, positioning, and ongoing operation of offshore oil and natural gas drilling rigs and platforms, and related infrastructure. Its vessels transport drilling materials, supplies, and personnel to offshore facilities, as well as move and position drilling structures. The company's fleet of offshore supply vessels comprise anchor handling, towing, and support vessels; platform supply vessels; fast supply or crew vessels; specialty vessels; standby rescue vessels; construction support vessels; and utility vessels. It also manages various vessels for third-party owners; and provides support services, such as chartering assistance and operational management services. As of March 30, 2018, the company operated a fleet of 69 owned vessels and 3 managed vessels. It serves integrated oil and natural gas companies; independent oil and natural gas exploration and production companies working in international markets; and foreign government-owned or controlled oil and natural gas companies, as well as companies that provide logistic, construction, and other services to such oil and natural gas companies, and foreign government organizations. The company has operations primarily in North Sea, offshore Southeast Asia, and offshore the Americas. GulfMark Offshore, Inc. was founded in 1996 and is based in Houston, Texas. As of November 15, 2018, Gulfmark Offshore, Inc. operates as a subsidiary of Tidewater Inc.