Robert Fullarton Fulton

Carrizo Oil & Gas, Inc. engaged in the exploration, development, and production of natural gas and oil. Its operations included Delaware Basin and Eagle Ford Shale. The company was founded by Sylvester P. Johnson IV and Steven Alan Webster in December 1993 and was headquartered in Houston, TX.

Basic Energy Services, Inc. engages in the provision of well site services to oil and natural gas drilling and producing companies. It operates its business through the following segments: Completion and Remedial Services, Well Servicing and Water Logistics. The Completion and Remedial Services segment utilizes coiled tubing services, air compressor packages specially configured for underbalanced drilling operations, an array of specialized rental equipment and fishing tools, thru-tubing, and snubbing units. The Well Servicing segment encompasses a full range of services performed with a mobile well servicing rig, including the installation and removal of downhole equipment and elimination of obstructions in the well bore to facilitate the flow of oil and natural gas. The Water Logistics segment focuses on the fleet of trucks and related assets, including specialized tank trucks, storage tanks, water wells, disposal facilities water treatment, and related equipment. The company was founded in 1992 and is headquartered in Fort Worth, TX.

Dynamic Offshore Resources, Inc. develops and acquires oil and natural gas properties. It owns a diversified asset base with fields virtually throughout the entire Gulf of Mexico Shelf. The company was founded in 2008 and is headquartered in Houston, TX.

Frontier Drilling ASA owns and operates drill ships for oil and natural gas exploration. It focuses on the operation and management of conventional drill ships, semi-submersibles and floating production, storage and offloading vessels. The company was founded by Erland Peter Bassøe on February 6, 1997 and is headquartered in Bergen, Norway.

Frontier Drilling USA, Inc. provides drilling and production services for the oil industry. It focuses on the operation and management of conventional drill ships, semi-submersibles, floating production, storage, and offloading vessels. The company is headquartered in Houston, TX.