GeoTomo develops high-end geophysical software products that help geophysicists around the world to image beneath the subsurface. Oil and gas companies use GeoTomo’s software solutions to significantly reduce the risk and cost of finding and producing hydrocarbons. Geophysical engineering companies use GeoTomo’s software products to image buried objects or near-surface layers. GeoTomo LLC services include 2D and 3D seismic and tomographic imaging and java software development used for the presentation of results. Software designers, programming engineers, and collaborating users work together to design, implement, and test the company's products.

Glen Rose Petroleum Corporation was founded in 1981 and is headquartered in Dallas, Texas. Glen Rose Petroleum Corporation, through its subsidiary, UHC Petroleum Corporation, operates as an independent producer of natural gas and crude oil. Glen Rose Petroleum Corporation operates the Wardlaw Field located in Edwards County, Texas. As of March 31, 2009, Glen Rose Petroleum Corporation had 103 wellbores, of which 90 are capable of production and 44 are producing wellbores. Glen Rose Petroleum Corporation was formerly known as United Heritage Corporation and changed its name to Glen Rose Petroleum Corporation in May 2008.

Global Energy Development is the international exploration and production arm of US-based HKN. HKN owns 34% of Global Energy Development, which focuses on Latin America. Global Energy Development is active in Colombia, Panama, and Peru, where it has received six contracts and rights to explore for or produce oil and gas. Global Energy Development holds a more than 5 million acre portfolio in Latin America and has proved and probable reserves of 15.2 million barrels of oil equivalent. Global Energy Development core operations are in Colombia, where it has been involved workover and drilling development activities in several fields. Global Energy Development is also active in northeastern Peru and in the Garachine field in Panama.

Global Geophysical builds its business from the ground down. Global Geophysical Services, Inc. provides seismic data acquisition services to the oil and gas industry for locating potential reservoirs and studying known reserves. Global Geophysical transmits sound waves below the earth's surface to create two- and three-dimensional images of the existing subsurface geology. The firm's seismic crews work in a wide variety of terrains, including deserts, jungles, mountains, and swamps, and have completed projects in more than 100 countries, including Algeria, Argentina, Chile, Colombia, Georgia, India, Iraq, Mexico, Oman, Peru, and Uganda. In 2009 the company filed for an IPO.

Great Plains Exploration has been exploring for oil and gas in the Great Plains of Canada since its spinoff from Eurogas Corporation. Great Plains focuses its drilling and exploration activities on properties in Alberta (including the Peace River Arch, Pembina, and Randell areas). In 2005 Great Plains Exploration Inc. acquired Calgary-based Rock Creek Resources. Great Plains Exploration Inc. has grown rapidly through acquisition with the additions of Energy Explorer and assets in the Altares area of northeastern British Columbia. In 2008 Great Plains Exploration Inc. acquired undeveloped lands and a large exploration block in northeastern British Columbia. Great Plains Exploration Inc. has proved plus probable reserves of 6.9 million barrels of oil equivalent.

Guardian Exploration Inc. is a junior oil and gas exploration company operating primarily in Montana's Blackfeet Indian Reservation. Guardian Exploration Inc. has relinquished its rights to the western block of the reservation, which contained 150,000 tribal mineral acres. But Guardian Exploration Inc. retains exploration rights on the east side of the reservation for 100,000 tribal mineral acres. The firm has not commercially produced in the area, and plans to seek new opportunities in Western Canada. In 2009 Guardian Exploration Inc. agreed to merge with fellow explorer Luxor Oil & Gas, but the deal fell through.

Habanero Resources hopes to become a hot item as an oil and gas, minerals, and precious metals prospector. Habanero Resources Inc. main assets are its stakes (an major acreage) in a handful of Alberta Oil Sands prospects. Traditionally an oil and gas explorer, Habanero Resources has diversified its operations as a hedge against lower oil prices. Habanero Resources Inc. holds significant acreage (more than 662,300 acres) in Yukon where it has set its sights on developing lithium prospects. Habanero Resources Inc. is also exploring for lithium in Alberta, holds two gold prospects in British Columbia, and has a silver prospect in the Yukon.

Harbison-Fischer manufacturing Company was founded and began operation in March of 1933 with a furnace, belt-drive machines and a Cadillac motor to turn the lathes. Harbison-Fischer (named after the men who founded the company) is reportedly the world's largest manufacturer of sub-surface oil well pumps. Specializing in downhole rod pump problems, equipment includes H-F pumps, pump parts, and accessories. The company's lineup offers sucker rod pump barrels, plungers and valve cages, John Martin polished rod clamps, and Johnson-Fagg stuffing boxes. Accessories range from pump anchors to sinker bars, and seating nipples. Harbison-Fischer has been managed and privately owned by the Fischers since 1972 and is currently run by its third generation.

Hardy Oil and Gas is a hearty endorser of the booming oil and gas industry. The international oil and gas exploration and production company primarily focuses on India, with strategic positioning in the oil and gas basins on the east coast of India and off of the Saurashtra west coast, near the Bombay High field. Hardy Oil and Gas plc has also acquired development assets in the proven oil province of the Niger Delta of Nigeria. Hardy Oil and Gas (then known as Jehan Energy Ltd.) was founded by Sastry Karra (CEO) and Yogeshwar Sharma (COO) in 1997. Hardy Oil and Gas plc was renamed Hardy Oil and Gas in 2001 and became a public company in 2005.

Helmerich & Payne International Drilling was established in 1958, when Helmerich & Payne began drilling for oil and natural gas in Venezuela. Helmerich & Payne International Drilling raises the platform for Latin American crude. The contract oil and gas driller (a subsidiary of Helmerich & Payne) operates 11 drilling rigs in Venezuela. Ecuador is a second core area, with eight rigs in operation there. Helmerich & Payne International Drilling also drills in Argentina (three rigs), Colombia (two rigs), Tunisia (one rig), Bolivia (one rig), and Chile (one rig). In 2007 Helmerich & Payne International Drilling continued operations under a management contract for a customer's rig located offshore Equatorial Guinea, and completed a drilling consulting services contract in Russia.

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