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Ampersand Management LLC (Ampersand Management) is a private equity firm founded in 1988 by Richard A. Charpie. The firm is headquartered in Wellesley, Massachusetts.

Stifel, Nicolaus & Co., Inc. (Stifel) is a dual-registered broker-dealer and investment adviser headquartered in St. Louis, Missouri. Founded in 1890, the firm is a subsidiary of Stifel Financial Corp. (NYSE: SF), a financial service holding company. Stifel provides full-service brokerage and investment advisory services to individuals and their families, institutions and businesses, and financial advisors.

Lime Rock Management LP (Lime Rock Management) is Private Equity firm founded in 1998 by Jonathan Clark Farber and John T. Reynolds. The firm is headquartered in Westport with additional office in London.

Lime Rock Partners LLC provides investment services in the exploration and production, energy service, and oil service technology sectors. The company was founded by Jonathan Clark Farber and John T. Reynolds in 1998 and is headquartered in Westport, CT.

Silixa Ltd. provides fiber optic monitoring solutions. It delivers data from distributed fiber-optic acoustic (iDAS™) and temperature (ULTIMA™ DTS and XT-DTS™) measurements. The firm offers products and services in the area of Oil & Gas, Pipeline Surveillance, Flow Metering, and Distributed Sensing. The company was founded by Mahmoud Farhadiroushan, Tom Parker, and Sergey Shatalin in April 2007 and is headquartered in Elstree, United Kingdom.

KSW Environmental LLC engages in provision of silica dust control solutions. It offers Airis Dust Vacuum 4 (ADV-4) that maximizes dust control with minimal disruption to other parts of completion. The company was founded in 2012 and is headquartered in Tulsa, OK.

TGT Oilfield Services DMCC operates as a through-barrier diagnostics for the oilfield. It creates products and technology that diagnose flow and integrity throughout the well system, from the wellbore to the reservoir giving its customers the clear picture of their wells and what’s happening in and around them enabling them to transform their productivity. The company was founded by Arthur Aslanyan, G.V. Vasiliev and Rustem L. Khamitov in 1998 and is headquartered in Dubai, United Arab Emirates.

San Jacinto Minerals, LLC operates as a acquisition vehicle. The company is headquartered in Denver, CO.

Airis Corp. provides residential properties management services. The private company is based in Houston.

Wayfinder Resources LLC provides oil and gas exploration and production services. The company was founded in 2017 and is headquartered in Houston, TX.

Primerock Resources LLC operates as oil exploration and production company. The firm acquires and develops undeveloped assets in core areas of Southeastern New Mexico and Texas. The company was founded by Manny Sirgo in April 2017 and is headquartered in Midland, TX.

Prairie Energy distributes electricity.