John Griggs

Nuverra Environmental Solutions, Inc. engages in the development and ongoing production of oil and natural gas from shale formations. It operates through the following segments: Rocky Mountain, Northeast, Southern, and Corporate and Other. The Rocky Mountain segment includes the Bakken shale area. The Northeast segment is comprised of the Marcellus and Utica shale areas. The Southern segment covers the Haynesville shale area. The Corporate and Other segment includes certain corporate costs and certain other corporate assets. The company was founded on May 29, 2007 and is headquartered in Houston, TX.

Rubicon Oilfield International Ltd provides support activities for oil and operations. The firm offers drilling and completion solutions and products. It also offers directional, horizontal well construction, performance, extended reach drilling, hole conditioning and frac plug milling applications. The company was founded by Michael E. Reeves and John B. Griggs in June 2015 and is headquartered in Houston, TX.

CSL Capital Management LLC (CSL Capital) is a private equity firm founded by Charles Leykum in 2008. The firm is headquartered in Houston, Texas.

Part of Piper Jaffray Cos., Simmons & Co. International Ltd. is a British company that provides brokerage services. The company is based in Edinburgh, UK. Colin I. Welsh has been the CEO of the company since 1999.

Conquest Completion Services LLC operates as an oilfield services company providing coiled tubing services, as well as surface equipment rentals. It offers coil tubing, downhole motors, completion fluids, oil skimmers, flow back and rental equipment. The company was founded by Nathan Moore in 2014 and is headquartered in Bossier, LA.

D. E. Shaw Laminar Portfolios LLC (DE Shaw Laminar) is a private equity subsidiary of D. E. Shaw & Co. LP founded in 1988. The firm is headquartered in New York.

Part of Innospec, Inc., Independence Oilfield Chemicals LLC specializes in stimulation of chemical and cementing solutions. The company is based in The Woodlands, TX. The company was founded by James Michael Brown. Independence Oilfield Chemicals was acquired by Innospec Oil Field Chemicals LLC from CSL Capital Management LLC on October 27, 2014 for $228 million.

Delta SubSea LLC provides remotely operated underwater vehicle (ROV) services and solutions, consulting and engineering, and tooling solutions for the subsea oil and gas industry. Its ROV fleet is focused on solutions for customers in the inspection, repair and maintenance, construction, drilling and decommissioning market segments. The firm's consulting and engineering division provides customers with services including: project management, subsea project support, subject matter experts, and client representation for diving/ROV/subsea construction. Its tooling solutions range from engineering and manufacturing to assembly, testing, training, operation, and maintenance. The company was founded by Scott Dingman in 2004 and is headquartered in Montgomery, TX.