The exploration and production industry in the US is vital to energy supply, focused on discovering and extracting oil and natural gas. Companies in this field vary in size and scope, offering array of services from offshore drilling to onshore oil recovery. Emerging technologies and innovative techniques are transforming traditional practices, fostering efficiency and sustainability. As the demand for cleaner energy rises, businesses are emphasizing environmental responsibility while pursuing new drilling technologies. The shift towards renewable energy resources is also shaping industry strategies, prompting exploration into lower-carbon solutions that could redefine fossil fuel extraction.

This list highlights sixteen notable exploration and production companies in the US, featuring a mix of private and corporate entities. Ranging in size from small operations employing a handful, to larger companies with thousands of staff, these firms span various states including Texas, California, and Louisiana. Founded between 1933 and 2020, they focus on oil and gas exploration, production, and environmental sustainability. Each company showcases unique capabilities, often leveraging advanced technologies in their quest for energy resources. This mix of established giants and newer enterprises illustrates the industry's scope and evolving nature.

Read on to discover the top exploration and production companies in the US.

Top 16 Exploration and Production Companies Companies in the US

1. Aera Energy LLC

• Website: aeraenergy.com
• Ownership type: Corporate
• Headquarters: Bakersfield, California, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Latest funding: $2.1B, February 2024
• Founded year: 1997
• Headcount: 1001-5000
• LinkedIn: aera-energy-llc

Aera Energy LLC, founded in 1997 and based in Bakersfield, California, specializes in the exploration and production of oil and natural gas. The company plays a crucial role in supplying energy resources to both individuals and businesses across California. Aera is not only focused on traditional energy production but is also investing in lower carbon energy solutions, reflecting a commitment to innovation and sustainability in the energy sector. As a subsidiary of California Resources Corporation, Aera operates primarily in Kern, Fresno, Monterey, and Ventura counties, which are key areas for oil production in the state. The company emphasizes community engagement and responsible energy practices, contributing to local initiatives and supporting various charitable causes. Aera's recent funding of $2.1 billion in February 2024 further underscores its active role in the industry and its potential for future growth.

2. Hunt Oil Company

• Website: huntoil.com
• Ownership type: Corporate
• Headquarters: Dallas, Texas, United States (USA)
• Latest funding: $1.0B, May 2021
• Founded year: 1934
• Headcount: 1001-5000
• LinkedIn: hunt-oil-company

Hunt Oil Company, founded in 1934 and based in Dallas, Texas, is a privately held oil and gas exploration and production firm. With a workforce of approximately 841 employees, the company has a robust operational footprint that spans across multiple continents, having drilled wells on every continent except Antarctica. Hunt Oil specializes in traditional exploration and production, as well as unconventional resource plays and complex pipeline operations. The company is also notable for its involvement in liquefied natural gas (LNG) projects, being the lead shareholder and operator of the PERU LNG project and a participant in the Yemen LNG project. Hunt Oil's operational strategy emphasizes innovation and efficiency, allowing it to adapt to various challenges in the energy sector. The company actively seeks opportunities for growth through exploration, development, and strategic partnerships, reinforcing its position in the global energy market.

3. SAVIA Perú

• Website: saviaperu.com
• Ownership type: Private
• Headquarters: United States (USA)
• Employee distribution: Peru 100%
• Founded year: 2009
• Headcount: 201-500
• LinkedIn: savia-peru

SAVIA Perú is a private hydrocarbon exploration company founded in 2009, based in the United States but fully operational in Peru. The company specializes in the exploration, development, production, and processing of hydrocarbons, primarily in the offshore regions of the northern coast of Peru. It has been recognized for its commitment to environmental sustainability and safety, ensuring that its operations contribute positively to the local communities and the environment. SAVIA operates the Z-2B block, which has been producing hydrocarbons and is in the exploitation phase, while also managing the Z-6 block, which has contingent gas resources. The company emphasizes a culture of safety and has implemented rigorous health and safety standards, aligning with international best practices. With a workforce of approximately 285 employees, SAVIA is dedicated to fostering relationships based on trust and transparency with its stakeholders, including local communities and regulatory bodies.

4. Hilcorp

• Website: hilcorp.com
• Ownership type: Private
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1989
• Headcount: 1001-5000
• LinkedIn: hilcorp

Hilcorp Energy Company, based in Houston, Texas, specializes in oil and natural gas exploration and production. Established in 1989, Hilcorp has grown to become one of the largest privately held independent energy companies in the United States. The company operates in several states, including Alabama, Alaska, Colorado, Louisiana, New Mexico, Ohio, Pennsylvania, Texas, and Wyoming. Hilcorp is known for its focus on efficient energy production and minimizing environmental impact. The company actively engages in the acquisition and development of legacy oil and gas assets, employing innovative solutions to enhance production and reduce emissions. Hilcorp's commitment to corporate responsibility is evident in its community impact initiatives and environmental stewardship efforts. With a workforce of approximately 2,000 employees, Hilcorp fosters a culture of ownership and urgency, encouraging its team to take initiative and drive results. The company has made significant investments in its operations, demonstrating a robust approach to growth and sustainability.

5. MII Oil Holding Inc

• Website: mii-holding.org
• Ownership type: Private
• Headquarters: Tallahassee, Florida, United States (USA)
• Employee distribution: Australia 100%
• Founded year: 2011
• Headcount: 1001-5000
• LinkedIn: mii-oil-holding-inc

MII Oil Holding Inc, founded in 2011 and based in Tallahassee, Florida, is an oil and gas company that specializes in the exploration and production of oil and gas resources. With a history in the energy sector dating back to 1982, MII Oil Holding Inc has developed a reputation for its commitment to maximizing production potential while also exploring geothermal energy solutions. The company operates globally, with significant activities in the Caspian Sea, Middle East, Africa, and South America. MII has produced approximately 4.9 million barrels of oil and 12 billion cubic feet of gas through its joint ventures. Their strategy includes limiting technical and political risks by focusing on projects that have been initiated but not fully developed, and they have established partnerships with various governments and joint venture partners to enhance their operational capabilities. MII Oil Holding Inc is also recognized by the United Nations as a supplier, further solidifying its standing in the industry.

6. Continental Resources

• Website: clr.com
• Ownership type: Private
• Headquarters: Oklahoma City, Oklahoma, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Founded year: 1967
• Headcount: 1001-5000
• LinkedIn: continental-resources_2

Continental Resources, based in Oklahoma City, Oklahoma, is an oil and gas company that specializes in the exploration and production of crude oil and natural gas. Established in 1967, the company has grown to become a significant player in the U.S. energy sector, particularly known for its operations in the Bakken play of North Dakota and Montana, where it is the largest leaseholder and producer. Continental Resources employs advanced technologies, including horizontal drilling and well stimulation, to maximize resource extraction from various basins across the United States. Their operations extend to the SCOOP and STACK plays in Oklahoma, as well as newly acquired positions in the Powder River Basin of Wyoming and the Permian Basin of Texas. The company emphasizes operational efficiency and environmental responsibility, implementing practices that protect groundwater and minimize their ecological footprint. With a workforce of approximately 1,448 employees, Continental Resources is committed to meeting the growing energy demands while maintaining high ethical and environmental standards.

7. The Termo Company

• Website: termoco.com
• Ownership type: Private
• Headquarters: Long Beach, California, United States (USA)
• Employee distribution: United States (USA) 91%, Iran 9%
• Founded year: 1933
• Headcount: 11-50
• LinkedIn: the-termo-company

The Termo Company, based in Long Beach, California, is an oil and gas exploration and production company founded in 1933. With a workforce of approximately 33 employees, the company specializes in the extraction of crude oil and natural gas, serving various businesses and organizations in the energy sector. Over the years, Termo has developed a reputation for its careful and cautious approach to business, which has allowed it to navigate the complexities of the oil and gas industry successfully. The company operates in multiple locations, including the Los Angeles Basin and Louisiana, and has drilled numerous wells, contributing to its production capabilities. Termo emphasizes the use of advanced technologies to enhance operational efficiency while minimizing environmental impact. Their commitment to safety, environmental responsibility, and community engagement is evident in their operational practices. The company continues to seek new opportunities for growth and development in the energy sector, reflecting its long-standing presence and relevance in the industry.

8. LLOG Exploration Co

• Website: llog.com
• Ownership type: Private
• Headquarters: Golden Meadow, Louisiana, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1977
• Headcount: 1-10
• LinkedIn: llog-exploration-co

LLOG Exploration Company, founded in 1977 and based in Golden Meadow, Louisiana, is a private entity specializing in oil and gas exploration and production. The company has carved out a niche in deepwater projects within the Gulf of Mexico, an area known for its rich hydrocarbon resources. LLOG has demonstrated a strong track record of exploration success and reserve growth, transitioning from onshore operations to becoming a notable operator in deepwater settings. With a workforce of around 201 professionals, LLOG prides itself on its commitment to safety, ethical practices, and sustainable growth. The company has recently made headlines by acquiring 41 deepwater blocks, showcasing its proactive approach to expanding its operational footprint. LLOG's focus on identifying and developing high-potential drilling prospects positions it as a relevant player in the exploration and production sector.

9. PetroQuest Energy LLC

• Website: petroquest.com
• Ownership type: Private
• Headquarters: Lafayette, Louisiana, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $3.1M, January 2018
• Founded year: 1995
• Headcount: 11-50
• LinkedIn: petroquest-energy-llc

PetroQuest Energy LLC is an independent energy company based in Lafayette, Louisiana, specializing in the exploration, development, acquisition, and production of oil and natural gas reserves. Established in 1995, the company has focused its operations primarily in Texas and Louisiana, with a notable emphasis on the Cotton Valley assets in East Texas and the Austin Chalk properties in Central Louisiana. PetroQuest operates the Thunder Bayou Production Facilities, which are designed to efficiently process oil and gas, showcasing the company's commitment to optimizing production capabilities. Over the years, PetroQuest has strategically adjusted its asset base, selling off certain properties while acquiring new ones to enhance its production and reserves. The company has also received funding, with a reported amount of $3.1 million in 2018, indicating ongoing financial activity to support its operations and growth initiatives.

10. Ecopetrol USA Inc.

• Website: ecopetrol-usa.com
• Ownership type: Private
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2020
• Headcount: 11-50
• LinkedIn: ecopetrol-usa-inc

Ecopetrol USA Inc. is an oil and gas company based in Houston, Texas, founded in 2020. As a subsidiary of Ecopetrol S.A., the national oil company of Colombia, Ecopetrol USA focuses on the exploration and production of hydrocarbons in key regions such as the Permian Basin and the Gulf of Mexico. The company is involved in trading crude oil, refined products, and natural gas, serving various businesses in the energy sector. With a workforce of approximately 45 employees, Ecopetrol USA is committed to contributing to the corporate goals set by the Ecopetrol Business Group, which includes a strategic plan aimed at sustainable growth and operational excellence. Their activities in the U.S. market reflect a proactive approach to energy production and resource management, aligning with broader industry trends.

11. Caelus Energy

• Website: caelusenergy.com
• Ownership type: Private
• Headquarters: Dallas, Texas, United States (USA)
• Employee distribution: United States (USA) 40%, Indonesia 40%, Belgium 21%
• Founded year: 2011
• Headcount: 51-200
• LinkedIn: caelus-energy

Caelus Energy LLC is an oil and gas exploration and production company headquartered in Dallas, Texas. Established in 2011, the company is privately held and employs between 51 to 200 individuals. Under the leadership of founder and CEO Jim Musselman, Caelus Energy has focused on responsible exploration and production of oil and gas resources. The company serves various businesses in the energy sector, providing essential resources while maintaining a commitment to ethical practices. Caelus has a notable presence not only in the United States but also in international markets, with a significant employee distribution in Indonesia and Belgium. Their recent confirmation of a large-scale discovery on the North Slope of Alaska underscores their active role in the industry and their potential for future growth.

12. Apex International Energy

• Website: apexintl.com
• Ownership type: Corporate
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: Egypt 78%, United States (USA) 22%
• Latest funding: February 2025
• Founded year: 2016
• Headcount: 201-500
• LinkedIn: apex-international-energy

Apex International Energy is an independent oil and gas exploration and production company based in Houston, Texas, with a strong operational focus in Egypt. Founded in 2016, the company has quickly established itself in the upstream sector, particularly in the Western Desert, where it engages in oil and gas exploration and hydrocarbon production. Apex operates several development leases and has a joint venture with the Egyptian General Petroleum Corporation, which enhances its operational capabilities. The company commenced production in August 2021 and has since seen a significant increase in output, reaching approximately 12,000 barrels of oil equivalent per day as of January 2024. Apex's strategy includes consolidating its acreage position and pursuing both organic growth and acquisitions to expand its footprint in the region. Their commitment to social responsibility and environmental stewardship further underscores their operational ethos, making them a noteworthy entity in the energy sector.

13. HEYCO Energy Group

• Website: heycoenergy.com
• Ownership type: Private
• Headquarters: Dallas, Texas, United States (USA)
• Employee distribution: United States (USA) 65%, Spain 35%
• Founded year: 1969
• Headcount: 51-200
• LinkedIn: heyco-energy-group

HEYCO Energy Group is a privately owned energy company based in Dallas, Texas, specializing in oil and gas exploration and production. Founded in 1969, the company has built a reputation for providing strategic investment and technical expertise to enhance energy resources. HEYCO operates in the United States and Europe, focusing on non-operated projects in states like New Mexico, East Texas, Wyoming, and Louisiana. In Europe, HEYCO Energy Iberia manages a natural gas field in Spain, while its subsidiary, Egdon Resources, is involved in various exploration and production activities in the UK. The company has a strong technical foundation, with a team experienced in geology, geophysics, and reservoir engineering, which it leverages to navigate the complexities of the energy sector. HEYCO is also recognized for its commitment to sustainable practices, including exploring green projects and reducing carbon emissions associated with its operations.

14. Cantium

• Website: cantium.us
• Ownership type: Private
• Headquarters: Covington, Louisiana, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: January 2019
• Founded year: 2017
• Headcount: 51-200
• LinkedIn: cantium

Cantium LLC is an independent oil and gas company based in Covington, Louisiana, established in 2017. The company specializes in exploration and production activities primarily in the Gulf of Mexico, where it operates several fields, including the Bay Marchand and Main Pass areas. Cantium's assets consist of 65 blocks that cover over 193,000 acres in shallow waters. The company prides itself on its operational efficiency and safety, maintaining a strong focus on environmental stewardship. With a team of experienced professionals, Cantium has successfully increased its production and reserves through strategic drilling programs and effective asset management. The company has produced approximately 6.7 million net BOE in 2023, with a significant portion being high-value crude oil. Cantium's commitment to maximizing production while minimizing environmental impact positions it as a relevant player in the exploration and production sector.

15. XTO Energy

• Website: xtoenergy.com
• Ownership type: Corporate
• Headquarters: Midland, Texas, United States (USA)
• Employee distribution: United States (USA) 97%, Other 3%
• Latest funding: $41.0B, December 2009
• Founded year: 1986
• Headcount: 1001-5000
• LinkedIn: xto-energy

XTO Energy Inc. is an energy company based in Midland, Texas, specializing in the production, processing, and transportation of oil and natural gas. Founded in 1986, the company has grown significantly, now employing around 2,300 people. As a subsidiary of ExxonMobil, XTO Energy operates extensively across North America, with a strong presence in key regions such as the Permian Basin, Bakken, and Appalachia. The company is known for its expertise in developing unconventional resources, utilizing advanced technologies to enhance production efficiency. XTO Energy manages over 50,000 producing oil and natural gas wells and holds more than 9.5 million acres of land. The company is also involved in community engagement and environmental responsibility, particularly in addressing methane emissions. XTO Energy's operational support extends beyond the U.S., with activities in Argentina as well.

16. Endeavor Energy Resources, LP

• Website: endeavorenergylp.com
• Ownership type: Corporate
• Headquarters: Midland, Texas, United States (USA)
• Employee distribution: United States (USA) 99%
• Latest funding: $26.0B, February 2024
• Founded year: 1979
• Headcount: 1001-5000
• LinkedIn: endeavor-energy-resources-lp

Endeavor Energy Resources, LP is a privately-held oil and gas company based in Midland, Texas. Established in 1979, the firm specializes in hydrocarbon exploration and production, primarily operating in the Midland Basin. With a workforce of over 1,200 employees, Endeavor has built a reputation as one of the largest private operators in the United States. The company holds approximately 470,000 net acres across various basins, with a significant focus on the Core 6 counties of the Midland Basin. Endeavor has implemented a sustainable horizontal drilling program, which has allowed it to complete over 1,100 gross operated horizontal wells. This operational strategy has positioned the company to produce more than 400,000 gross operated barrels of oil equivalent per day. Endeavor's commitment to community service and employee engagement further underscores its role as a responsible operator in the energy sector.

Exploration and Production Companies Insights: Key Companies in the US

Company	Headquarter	Size	Founded	Ownership
Aera Energy LLC	Bakersfield, California, United States (USA)	1001-5000	1997	Corporate
Hunt Oil Company	Dallas, Texas, United States (USA)	1001-5000	1934	Corporate
SAVIA Perú	United States (USA)	201-500	2009	Private
Hilcorp	Houston, Texas, United States (USA)	1001-5000	1989	Private
MII Oil Holding Inc	Tallahassee, Florida, United States (USA)	1001-5000	2011	Private
Continental Resources	Oklahoma City, Oklahoma, United States (USA)	1001-5000	1967	Private
The Termo Company	Long Beach, California, United States (USA)	11-50	1933	Private
LLOG Exploration Co	Golden Meadow, Louisiana, United States (USA)	1-10	1977	Private
PetroQuest Energy LLC	Lafayette, Louisiana, United States (USA)	11-50	1995	Private
Ecopetrol USA Inc.	Houston, Texas, United States (USA)	11-50	2020	Private
Caelus Energy	Dallas, Texas, United States (USA)	51-200	2011	Private
Apex International Energy	Houston, Texas, United States (USA)	201-500	2016	Corporate
HEYCO Energy Group	Dallas, Texas, United States (USA)	51-200	1969	Private
Cantium	Covington, Louisiana, United States (USA)	51-200	2017	Private
XTO Energy	Midland, Texas, United States (USA)	1001-5000	1986	Corporate
Endeavor Energy Resources, LP	Midland, Texas, United States (USA)	1001-5000	1979	Corporate

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