Sheldon B. Lubar

Ellora Energy, Inc. provides oil and gas exploration and production services. It primarily operates in two areas, east Texas and adjacent lands in western Louisiana; and the Hugoton field in southwest Kansas. the company was founded in 1995 and is headquartered in Boulder, CO.

Crosstex Energy, Inc. engages in the gathering, transmission, processing and marketing of natural gas and natural gas liquids through its subsidiaries. It connects the wells of natural gas producers in the geographic areas of its gathering systems in order to gather for a fee or purchase the gas production, processes natural gas for the removal of natural gas liquids, transports and ultimately provides natural gas and natural gas liquids to a variety of markets. The company operates through three reportable segments consisting of Natural Gas Gathering, Processing and Transmission operations located in North Texas, Pipelines and Processing plants located in Louisiana and South Louisiana Processing and Natural Gas Liquid Assets. The Natural Gas Gathering, Processing, Fractonation and Transmission segment includes the drilling of wells into gas bearing rock formations and the pipelines receive natural gas from mainline transmission pipelines, processing plants and gathering systems. The Pipelines and Processing Plants segment includes on-system processing Plants. The South Louisiana Processing And Natural gas Liquid segment includes eunice processing plant and fractionation facility, riverside fractionation plant, cajun sibon pipeline system and napoleonville storage facility. The company was founded on April 28, 2000 and is headquartered in Dallas, TX.

Lubar & Co Inc (Lubar) is a private equity firm founded in 1968 by Sheldon Lubar. The firm is headquartered in Milwaukee, Wisconsin.

Approach Resources, Inc. engages in the exploration, development, production, and acquisition of oil and gas properties. It focuses on oil and natural gas reserves in oil shale and tight sands located in the Permian Basin in West Texas. It holds interests in the East Texas Basin and the Chama Basin in Northern New Mexico. The firm operates in one business segment, the exploration and production of oil, NGLs and natural gas. The company was founded by J. Ross Craft in September 2002 and is headquartered in Fort Worth, TX.

Part of EnLink Midstream LLC, EnLink Midstream GP LLC explores for oil and gas and also provides oil pipeline transportation services. The private company is based in Dallas, TX. Barry E. Davis has been the CEO of the company since 2002.

Part of Kestrel Energy Partners LLC, Kestrel Heat LLC is a general partner firm that provides investment services. The private company is based in Stamford, CT. The company was founded by Paul A. Vermylen. Jeffrey M. Woosnam has been the CEO of the company since 2019.

Milwaukee Art Museum, Inc. operates as a public museum. It collects and preserves antique and present-day works, american & european art, contemporary art and american decorative arts. The company was founded in 1888 and is headquartered in Milwaukee, WI.

Weatherford International, Inc., provides equipment and services used in the drilling, evaluation, completion, production, and intervention of oil and natural gas wells worldwide. Its products and services include artificial lift systems, such as progressing cavity pumps, reciprocating rod lift systems, gas lift systems, hydraulic lift systems, plunger lift systems, hybrid lift systems, wellhead systems, production optimization products, well optimization controllers, flow measurement metering and software solutions, field optimization tools, and heavy oil production optimization equipment. The company is base in Houston, TX

Ixonia Bancshares, Inc. operates as a bank holding company. It provides personal and banking services through its bank subsidiary. The company was founded in 1987 and is headquartered in Ixonia, WI.