The offshore oil and gas industry plays a crucial role in global energy production, extracting vital resources from beneath the oceans. Companies operating in this sector range from large corporations to small independents, focusing on exploration, drilling, and production of hydrocarbons. This industry also encounters challenges, such as shifting environmental regulations and the push for cleaner energy. Interestingly, advancements in technology have improved safety measures and reduced costs, making offshore operations more efficient. Amidst these changes, the demand for energy persists, driving companies to innovate and adapt while balancing profitability with sustainability.

This list features 19 offshore oil and gas companies in the US, varying in size from small niche players to larger-scale firms. The headquarters span several states including Texas, Louisiana, and California, reflecting the industry’s geographical concentration. Established between the late 1930s and 2020, each company specializes in unique facets of the sector, such as drilling, production, and supply support. Their varying employee counts, strategies, and market positions contribute to a dynamic marketplace, highlighting a blend of innovation and tradition that underpins offshore operations.

Continue reading to explore the top offshore oil and gas companies in the US.

Top 19 Offshore Oil And Gas Companies in the US

1. 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 region of northern Peru. As the only offshore operator in the country, SAVIA plays a critical role in the local energy sector. They have been involved in the management of the Z-2B block, which has been producing hydrocarbons and contributing to the region's energy security. The company emphasizes environmental sustainability and safety, adhering to international standards in their operations. Their commitment to corporate social responsibility is evident through various community engagement initiatives. With a workforce of approximately 285 employees, SAVIA is positioned to continue its operations and potentially expand its influence in the Peruvian offshore oil and gas market.

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, based in Dallas, Texas, is a privately held oil and gas exploration and production firm with a rich history dating back to 1934. The company has successfully navigated the complexities of the energy sector for over 90 years, focusing on the extraction and processing of petroleum resources. Hunt Oil operates both domestically and internationally, with a presence in North America, South America, Europe, and the Middle East. The company has drilled wells on every continent except Antarctica, showcasing its global reach. Hunt Oil is particularly noted for its offshore operations, having made significant discoveries in the Gulf of Mexico and the North Sea. Additionally, the company is involved in LNG projects, including the PERU LNG project, which highlights its commitment to expanding its operational capabilities in the energy market. With a workforce of over 800 employees, Hunt Oil emphasizes innovation and operational efficiency, striving to create value through its exploration and production activities.

3. Arena Offshore, LP

• Website: arenaoffshore.com
• Ownership type: Private
• Headquarters: The Woodlands, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2002
• Headcount: 51-200
• LinkedIn: arena-offshore-lp

Arena Offshore, LP, based in The Woodlands, Texas, is an oil and gas operator that focuses on offshore drilling and production in the Gulf of Mexico. Founded in 2002, the company has established itself as a significant player in the industry, operating over 30 offshore fields and managing more than 115 platforms. Arena Offshore is dedicated to efficient extraction and midstream transportation of crude oil and natural gas, providing services to various exploration and production companies. The firm prides itself on its commitment to safety and environmental compliance, boasting a strong compliance record with incidents of noncompliance significantly lower than the industry average. With a team of skilled professionals, Arena Offshore drills approximately 20-30 wells annually and has a production capacity of around 50,000 barrels of oil equivalent per day. Their operational strategy includes a long-term commitment to projects, ensuring thorough oversight from planning through to abandonment, which underscores their reliability in the offshore oil and gas sector.

4. 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 a private 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, the company has developed a global presence, particularly in regions such as the Caspian Sea, Middle East, Africa, and South America. MII Oil Holding Inc is also involved in geothermal energy solutions, reflecting a commitment to clean energy initiatives. The company has produced approximately 4.9 million barrels of oil and 12 billion cubic feet of gas through its joint ventures, which are strategically aligned with stable governments and partners. MII Oil Holding Inc is recognized by the United Nations as a supplier, further establishing its credibility in the industry. Despite its relatively small size, with 15 employees reported on LinkedIn, the company continues to pursue opportunities to enhance production and develop energy resources.

5. Dcor, L.L.C.

• Website: dcorllc.com
• Ownership type: Private
• Headquarters: Oxnard, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2001
• Headcount: 201-500
• LinkedIn: dcor-l.l.c.

Dcor, L.L.C. is an energy company based in Oxnard, California, specializing in offshore energy production. Founded in 2001, the company has built a solid foundation in the industry, focusing on operational excellence and environmental responsibility. Dcor is dedicated to safe production practices, ensuring the health and safety of its employees while also being mindful of the environmental impact of its operations. With a workforce of approximately 300 employees, Dcor leverages technology and extensive operational experience to optimize production from its assets. The company operates primarily on the West Coast, contributing to the local energy sector while maintaining a commitment to community and environmental stewardship.

6. 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 Co is an oil and gas exploration and production company based in Golden Meadow, Louisiana. Established in 1977, LLOG has transitioned from early onshore operations to a strong focus on deepwater projects in the Gulf of Mexico. The company prides itself on its commitment to sustainable practices and high ethical standards in its operations. With a team of approximately 201 professionals, LLOG has achieved notable exploration success and reserve growth over the years. Their recent activities include the acquisition of 41 deepwater blocks, showcasing their ongoing investment in exploration and production. LLOG operates with a clear mission to deliver profitable growth while maintaining a strong emphasis on safety and ethical practices in the energy sector.

7. Arena Energy, LLC

• Website: arenaenergy.com
• Ownership type: Corporate
• Headquarters: The Woodlands, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: October 2020
• Founded year: 1999
• Headcount: 51-200
• LinkedIn: arena-energy-lp

Arena Energy, LLC, based in The Woodlands, Texas, is an oil and gas exploration company that specializes in offshore drilling in the Gulf of Mexico. Founded in 1999, the company has built a reputation for its expertise in identifying and developing oil and gas reserves. Arena Energy operates primarily in the Gulf of Mexico Shelf, where it has drilled over 350 wells, with more than 85% of these wells drilled by its affiliate, Arena Offshore. The company prides itself on its high drilling success rate of over 94%, which reflects its technical proficiency and strategic approach to exploration. With a net production exceeding 30,000 barrels of oil equivalent per day, Arena Energy has positioned itself as one of the lower-cost producers in the region. The firm has invested over $4.5 billion in capital, funded entirely through cash flow from its operations, demonstrating a commitment to sustainable growth and financial independence. Arena Energy's focus on exploiting mature oilfields, combined with its advanced technology and skilled workforce, allows it to uncover hidden oil and gas accumulations that many larger companies may overlook.

8. EnVen Energy Ventures

• Website: enven.com
• Ownership type: Corporate
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $1.1B, September 2022
• Founded year: 2014
• Headcount: 1-10
• LinkedIn: enven-energy-ventures-llc

EnVen Energy Ventures is an energy company based in Houston, Texas, established in 2014. The firm specializes in operated deepwater exploration and production in the Gulf of Mexico, alongside managing international and midstream assets. With a workforce of around 65 employees, EnVen plays a crucial role in the energy sector by providing essential services for the exploration and production of oil and gas resources. The company has recently restructured to enhance its focus on these core areas, reflecting a commitment to growth and operational excellence. In September 2022, EnVen secured $1.1 billion in funding, underscoring its potential and the confidence investors have in its strategic direction.

9. 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, founded in 2017 and based in Covington, Louisiana, is an independent oil and gas company dedicated to exploration and production in the Gulf of Mexico. The company operates several fields, including the Bay Marchand and Main Pass areas, and manages a portfolio of assets that spans over 193,000 acres across 65 blocks in shallow waters. Cantium's operational focus is on maximizing production efficiency and maintaining a robust financial profile. The company prides itself on its commitment to safety and environmental responsibility, achieving high safety rankings and compliance with regulatory standards. With a team of experienced professionals, Cantium employs advanced technology and data analytics to optimize its operations and identify growth opportunities. The company has produced approximately 37 million barrels of oil equivalent since its inception, showcasing its active role in the offshore oil and gas sector.

10. Beacon Offshore Energy

• Website: beaconoffshore.com
• Ownership type: Private
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: United States (USA) 94%, South Korea 4%, Other 1%
• Founded year: 2016
• Headcount: 51-200
• LinkedIn: beaconoffshore

Beacon Offshore Energy is a Houston-based exploration and production company that specializes in the acquisition, exploration, and development of upstream oil and gas properties in the deepwater Gulf of Mexico. Established in 2016, the company has built a strong operational foundation, currently holding interests in 87 deepwater leases that span nearly 500,000 gross acres. The team at Beacon is composed of seasoned professionals with an average of over 30 years of experience in the industry, focusing on high-margin, low-carbon energy solutions. Their recent operational updates highlight significant projects such as Winterfell and Shenandoah, which are poised to contribute to their production capabilities. Beacon Offshore Energy is committed to responsible growth and environmental stewardship, emphasizing a low carbon footprint in their operations. This focus on sustainability, combined with their active development projects, positions them as a noteworthy player in the offshore oil and gas sector.

11. Deep Gulf Energy

• Website: deepgulfenergy.com
• Ownership type: Corporate
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $1.2B, August 2018
• Founded year: 2005
• Headcount: 11-50
• LinkedIn: deep-gulf-energy

Deep Gulf Energy is an energy company headquartered in Houston, Texas, specializing in the exploration and production of oil and gas from deepwater locations. Founded in 2005, the company has focused its operations in proven basins, particularly in the Gulf of Mexico. With a small team of approximately 33 employees, Deep Gulf Energy emphasizes sustainability and responsible practices in its operations, aiming to meet the growing global energy demand while minimizing environmental impact. The company has engaged in various projects that highlight its commitment to efficient resource management and community engagement, although specific details on recent projects or partnerships are not extensively documented.

12. Petrolog Group

• Website: petrologgroup.com
• Ownership type: Private
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: Nigeria 66%, Angola 21%, United States (USA) 10%, Other 3%
• Founded year: 1983
• Headcount: 501-1000
• LinkedIn: petrolog-limited

Petrolog Group, established in 1983 and based in Houston, Texas, is an oilfield services company that specializes in integrated petroleum services. The company offers a comprehensive suite of services, including drilling, engineering, subsea solutions, and surface logging. With a workforce that is predominantly located in Nigeria and Angola, Petrolog Group plays a crucial role in supporting oil and gas operations in these regions. Their expertise extends to complex drilling operations, engineering design, and project management, catering to the unique challenges of offshore environments. Petrolog Group is committed to enhancing production efficiency and safety for its clients, making it a significant player in the offshore oil and gas industry.

13. Zentech Incorporated

• Website: zentech-usa.com
• Ownership type: Private
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: India 37%, United States (USA) 33%, United Arab Emirates 22%, Other 8%
• Founded year: 1978
• Headcount: 51-200
• LinkedIn: zentech

Zentech Incorporated, founded in 1978 and based in Houston, Texas, is an engineering consulting firm that specializes in providing comprehensive engineering services and project management for the offshore oil and gas industry. The company offers a range of services, including reactivation solutions for jack-up rigs and semi-submersible rigs, which are essential for maintaining and upgrading offshore assets. Zentech's expertise extends to various engineering disciplines, such as structural, mechanical, and electrical engineering, which are crucial for the design and operation of offshore facilities. They also engage in renewable energy projects, reflecting a commitment to sustainability. With a workforce that includes a significant percentage of employees based in India, the UAE, and Brazil, Zentech demonstrates a global reach in its operations. Their client portfolio includes asset owners looking to improve operational efficiency and sustainability, underscoring their relevance in the offshore oil and gas sector.

14. Ridgewood Energy

• Website: ridgewoodenergy.com
• Ownership type: Private
• Headquarters: Montvale, New Jersey, United States (USA)
• Employee distribution: United States (USA) 90%, Egypt 10%
• Founded year: 1982
• Headcount: 51-200
• LinkedIn: ridgewood-energy

Ridgewood Energy, founded in 1982 and based in Montvale, New Jersey, is a private equity firm that concentrates on investments in the U.S. oil and gas sector, with a particular emphasis on the Deepwater Gulf of Mexico. The firm aims to generate high-value production through its portfolio of conventional oil and gas projects. Ridgewood Energy is committed to providing essential energy resources that meet the needs of various industries across the United States. Their approach is data-driven and relies on advanced technology and industry expertise to identify and capitalize on opportunities in the offshore market. The firm also prioritizes environmental considerations, focusing on projects that can deliver low-cost and low-emission energy solutions. With a small team of around 79 employees, Ridgewood Energy operates primarily in the U.S. but has a presence in Egypt as well.

15. 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, it plays a crucial role in the exploration and production of hydrocarbons in the United States. The company operates primarily in the Permian Basin and the Gulf of Mexico, focusing on both conventional and unconventional oil and gas resources. Ecopetrol USA engages in trading crude oil, refined products, and natural gas, serving various businesses in the energy sector. Its subsidiary, Ecopetrol America LLC, is responsible for offshore operations in the Gulf of Mexico, where it holds interests in multiple producing assets and lease blocks. The company aims to contribute to the Ecopetrol Business Group's strategic goals, emphasizing sustainable practices and operational excellence in its endeavors.

16. Ershigs, Inc. by Fiber Glass Systems

• Website: ershigs.com
• Ownership type: Private
• Headquarters: Bellingham, Washington, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1921
• Headcount: 201-500
• LinkedIn: ershigs-inc.

Ershigs, Inc. by Fiber Glass Systems, based in Bellingham, Washington, is a private company that operates under the umbrella of NOV, a prominent energy solutions provider. Founded in 1921, Ershigs specializes in composite solutions tailored for the oil and gas industry. Their products are designed to withstand the harsh conditions often found in offshore environments, making them a valuable resource for companies engaged in drilling and production. Ershigs focuses on innovation and customer service, providing materials that enhance operational efficiency and safety. Their involvement in offshore construction and engineering projects highlights their commitment to supporting the energy sector, particularly in areas requiring advanced composite materials. While they do not report any recent funding, their long-standing presence in the industry and affiliation with NOV underscore their relevance in the oil and gas market.

17. Castex Energy, Inc.

• Website: castexenergy.com
• Ownership type: Private
• Headquarters: Houston, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: September 2014
• Founded year: 1987
• Headcount: 51-200
• LinkedIn: castex-energy-inc

Castex Energy, Inc. is an oil and gas exploration company based in Houston, Texas, founded in 1987. The company specializes in upstream activities, focusing on the acquisition, development, and monetization of oil and gas reserves. With a dedicated team of professionals, Castex has built a reputation for reliability and expertise in the Gulf Coast region, particularly in the Gulf of Mexico. They have successfully executed a full-cycle business model, resulting in significant asset sales and returns for stakeholders. Castex is also recognized for its commitment to health, safety, and environmental practices, having implemented various initiatives to ensure responsible exploration and production. Their recent establishment of Castex Carbon Solutions highlights their proactive approach to addressing environmental concerns through carbon capture and storage projects. Overall, Castex Energy is a notable player in the oil and gas sector, with a focus on both conventional and sustainable energy opportunities.

18. Cox Oil, LLC

• Website: coxoil.com
• Ownership type: Private
• Headquarters: Dallas, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2004
• Headcount: 501-1000
• LinkedIn: cox-oil-llc

Cox Oil, LLC, based in Dallas, Texas, is a private oil and gas company that specializes in offshore operations, particularly in the Gulf of Mexico. Founded in 2004 by Brad E. Cox, a fourth-generation oilman, the company has established a robust portfolio, managing over 600 producing wells across approximately 500 structures in 66 fields. With a daily production rate of around 85,000 barrels of oil equivalent (BOE), Cox Oil plays a significant role in the offshore oil sector. The company emphasizes environmental safety and operational efficiency, adhering to stringent safety regulations and maintaining a proactive approach to environmental stewardship. Their operational reach extends from offshore Florida to Texas, and they are recognized for their commitment to employing field personnel rather than relying on outside contractors, which enhances their operational integrity. Cox Oil's involvement in the Clean Gulf Associates further underscores their dedication to environmental safety and incident response capabilities, positioning them as a responsible player in the industry.

19. Adriatic Marine, LLC

• Website: adriaticmarinellc.com
• Ownership type: Private
• Headquarters: Raceland, Louisiana, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2006
• Headcount: 201-500
• LinkedIn: adriatic-marine-llc

Adriatic Marine, LLC, founded in 2006 and based in Raceland, Louisiana, operates as an offshore supply vessel company. The firm provides a range of services that cater primarily to the offshore oil and gas industry, as well as the renewable energy sector. Their fleet includes advanced multi-purpose vessels equipped with modern technologies such as Dynamic Positioning and lower emission engines. This focus on innovation allows them to meet the demands of various operations on the continental shelf of the U.S. Gulf of Mexico. Adriatic Marine's services extend beyond vessel operation; they also offer construction support, ROV services, offshore housing, and catering. Their commitment to quality and efficiency has made them a preferred choice among offshore operators, demonstrating their relevance in the industry.

Offshore Oil And Gas Insights: Key Companies in the US

Company	Headquarter	Size	Founded	Ownership
SAVIA Perú	United States (USA)	201-500	2009	Private
Hunt Oil Company	Dallas, Texas, United States (USA)	1001-5000	1934	Corporate
Arena Offshore, LP	The Woodlands, Texas, United States (USA)	51-200	2002	Private
MII Oil Holding Inc	Tallahassee, Florida, United States (USA)	1001-5000	2011	Private
Dcor, L.L.C.	Oxnard, California, United States (USA)	201-500	2001	Private
LLOG Exploration Co	Golden Meadow, Louisiana, United States (USA)	1-10	1977	Private
Arena Energy, LLC	The Woodlands, Texas, United States (USA)	51-200	1999	Corporate
EnVen Energy Ventures	Houston, Texas, United States (USA)	1-10	2014	Corporate
Cantium	Covington, Louisiana, United States (USA)	51-200	2017	Private
Beacon Offshore Energy	Houston, Texas, United States (USA)	51-200	2016	Private
Deep Gulf Energy	Houston, Texas, United States (USA)	11-50	2005	Corporate
Petrolog Group	Houston, Texas, United States (USA)	501-1000	1983	Private
Zentech Incorporated	Houston, Texas, United States (USA)	51-200	1978	Private
Ridgewood Energy	Montvale, New Jersey, United States (USA)	51-200	1982	Private
Ecopetrol USA Inc.	Houston, Texas, United States (USA)	11-50	2020	Private
Ershigs, Inc. by Fiber Glass Systems	Bellingham, Washington, United States (USA)	201-500	1921	Private
Castex Energy, Inc.	Houston, Texas, United States (USA)	51-200	1987	Private
Cox Oil, LLC	Dallas, Texas, United States (USA)	501-1000	2004	Private
Adriatic Marine, LLC	Raceland, Louisiana, United States (USA)	201-500	2006	Private

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