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Cardinal Energy Group, Inc. engages in the exploration, development, exploitation, and production of oil and natural gas in the United States. It owns various working interests in oil and gas leases located in Texas. The company sells its oil and gas products to domestic purchasers of oil and gas production. Cardinal Energy Group, Inc. was incorporated in 2007 and is based in Abilene, Texas.

Dawson Geophysical Company provides onshore seismic data acquisition and processing services in the United States and Canada. The company acquires and processes 2-D, 3-D, and multi-component seismic data for its clients, including oil and gas companies, and independent oil and gas operators, as well as providers of multi-client data libraries. Its seismic crews supply seismic data primarily to companies engaged in the exploration and development of oil and natural gas on land and in land-to-water transition areas. The company also serves the potash mining industry. The company was founded in 1952 and is headquartered in Midland, Texas. Dawson Geophysical Company is a subsidiary of Wilks Brothers, LLC.

ION Geophysical Corporation provides data-driven decision-making to offshore energy, and ports, and defense industries worldwide. The company operates through two segments, E&P Technology & Services and Operations Optimization. The E&P Technology & Services segment creates digital data assets and delivers services to help E&P companies improve decision-making and reduce risk. This segment includes two synergistic groups, imaging and reservoir services, and ventures. The company's Imaging and Reservoir Services group provides data processing, imaging, and reservoir services that improve image quality and subsurface insights, helping E&P companies reduce exploration and production risk, evaluate and develop reservoirs, and increase production. Its Imaging and Reservoir Services group develops and applies proprietary processing algorithms through its imaging engine to data owned or licensed by its customers to translate raw data into subsurface images. The Operations Optimization segment develops mission-critical subscription offerings and provides engineering services that enable operational control and optimization offshore. This segment includes the company's Optimization Software & Services and Devices offerings. The company's Optimization Software & Services group provides survey design, command, and control software systems and related services for marine towed streamer and seabed operations. Its Devices offerings group develops intelligent equipment controlled by its software to optimize operations. The company sells its services and products through a direct sales force consisting of employees and international third-party sales representatives. ION Geophysical Corporation was formerly known as Input/Output, Inc. and changed its name to ION Geophysical Corporation in 2007. The company was founded in 1968 and is headquartered in Houston, Texas. On April 12, 2022, ION Geophysical Corporation along with its affiliates, filed a voluntary petition for reorganization under Chapter 11 in the U.S. Bankruptcy Court for the Southern District of Texas.

SAExploration Holdings, Inc. is an oilfield services company. It is engaged in the provision of seismic data acquisition and logistical support services, which includes program design, planning & permitting; camp services; surveying & drilling; and reclamation. The company was founded on February 2, 2011 and is headquartered in Houston, TX.

Zion Oil & Gas, Inc. engages in exploration of oil and natural gas properties. It holds one petroleum exploration license onshore Israel, the Megiddo-Jezreel license. The company was founded by John M. Brown in 2000 and is headquartered in Dallas, TX.