Published by Global Banking & Finance Review®
Posted on July 18, 2025
4 min readLast updated: January 22, 2026
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Discover major oil and gas mergers since 2000, including Chevron's $53 billion Hess deal, shaping the energy landscape.
(Reuters) -U.S. oil and gas major Chevron completed its $53 billion acquisition of Hess on Friday, after it prevailed in a landmark legal battle against larger rival Exxon Mobil to gain access to the biggest oil discovery in decades.
Chevron's acquisition of Hess will secure the company a 30% stake in Guyana's prolific Stabroek Block, making it one of the biggest deals in the oil and gas industry.
Mergers and acquisitions in the shale industry have drawn increased antitrust scrutiny, with the U.S. Federal Trade Commission reviewing several multi-billion dollar deals, including Chevron, Exxon Mobil , Diamondback Energy, Occidental Petroleum and Expand Energy , formerly known as Chesapeake Energy.
Here are the major deals in the global oil and gas sector since the 2000s:
2001
Chevron buys Texaco in a $39.5 billion deal and emerges as one of the largest energy firms in the world.
2002
Shareholders of Conoco and Phillips Petroleum, and the Federal Trade Commission approve an $18 billion merger between the companies and created the third-largest U.S. oil firm ConocoPhillips.
2005
Chevron agrees to buy California rival Unocal for about $16.4 billion after fighting off Italian oil group Eni, China's CNOOC and other rumored suitors.
2006
ConocoPhillips acquires Burlington Resources in a $35.6 billion deal and gains access to lucrative positions in North American gas-rich basins. 2007
Norway's Statoil buys the oil and gas assets of Norsk Hydro for $30 billion to create a new energy firm, Equinor.
2010
Exxon Mobil acquires XTO Energy for about $30 billion in stock to bolster its position as a leading U.S. natural gas producer.
2012
Russia's state oil company Rosneft buys TNK-BP from UK-based BP in a $55 billion deal.
Kinder Morgan finalizes a $21 billion deal to buy El Paso Corp, combining the two largest natural gas pipeline operators.
2014
Kinder Morgan buys all of its publicly traded units (Kinder Morgan Energy Partners LP, Kinder Morgan Inc with Kinder Morgan Management and El Paso Pipeline Partners) in a $70 billion deal.
2015
Shell, which was then known as Royal Dutch Shell acquires British rival BG Group in a $70 billion deal.
2018
Marathon Petroleum takes over rival Andeavor for $23 billion.
2019
Occidental Petroleum acquires Anadarko Petroleum in a $38 billion deal.
2020
ConocoPhillips buys Concho Resources for $9.7 billion in 2020's top shale deal.
Saudi Aramco completes its purchase of a 70% stake in petrochemicals company Saudi Basic Industries for $69.1 billion.
PipeChina takes over oil and gas pipelines, and storage facilities from PetroChina and Sinopec in a deal valued at $55.9 billion. 2021
Norway's Aker BP buys Sweden's Lundin Energy in a $13.9 billion cash and stock deal to form Norway's second largest listed oil firm.
BHP Group agrees to sell its petroleum business to Woodside Petroleum in a $28 billion merger to create an oil and gas producer with growth assets in Australia and the Americas now known as Woodside Energy.
2023
Magellan Midstream Partners' unitholders vote in favor of its sale to larger rival ONEOK for $18.8 billion, creating one of the largest U.S. energy pipeline companies.
Exxon Mobil agrees to buy Pioneer Natural Resources in an all-stock deal valued at $59.5 billion that would make it the biggest producer in the largest U.S. oilfield and secure a decade of low-cost production.
Chevron agrees to buy smaller rival Hess Corp in a $53 billion all-stock deal, putting the company head-to-head against rival Exxon Mobil in two of the world's fastest growing oil basins - shale and Guyana.
Occidental Petroleum agrees to buy privately held CrownRock in a cash-and-stock deal valued at $12 billion, its biggest since the debt-laden acquisition of Anadarko Petroleum in 2019.
2024
Diamondback Energy signs an agreement to acquire privately held rival Endeavor Energy Partners in a $26 billion cash-and-stock deal to boost its presence in the prolific Permian basin.
(Reporting by Seher Dareen, Sourasis Bose, Roshia Sabu, Pooja Menon and Vallari Srivastava in Bengaluru; Editing by Shinjini Ganguli, Jamie Freed, Arun Koyyur and Anil D'Silva)
Chevron completed its acquisition of Hess for $53 billion, securing a significant stake in Guyana's Stabroek Block.
Exxon Mobil acquired XTO Energy for about $30 billion in stock to enhance its position as a leading U.S. natural gas producer.
In 2012, Russia's state oil company Rosneft purchased TNK-BP from UK-based BP in a deal valued at $55 billion.
Kinder Morgan finalized a $21 billion deal to acquire El Paso Corp, merging the two largest natural gas pipeline operators.
Exxon Mobil's agreement to buy Pioneer Natural Resources for $59.5 billion would make it the biggest producer in the largest U.S. oilfield.
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