Hornbeck Offshore Services, Inc. operates offshore supply vessels (OSVs), multi-purpose support vessels (MPSVs), and a shore-base to provide logistics support and specialty services to the offshore oil and gas exploration and production industry, primarily in the United States, Gulf of Mexico and select international markets. The Company, through its subsidiaries, also operates ocean-going tugs and tank barges that provide transportation of petroleum products, primarily in the northeastern United States, Gulf of Mexico and Puerto Rico. The Company owns a 49% interest in Hornbeck Offshore Trinidad & Tobago Limited (HOTT-Ltd). HOTT-Ltd is a vessel crewing and management services company established to support the Company’s Trinidad & Tobago-based operations. The Company operates in two segments: Upstream and Downstream.