Mitsubishi Corporation has completed its acquisition of US shale gas producer Aethon Energy, closing the $7.2 billion transaction first announced in January. The deal is the largest acquisition in the Japanese trading and investment firm's history.
In a statement issued 14 July, Aethon Energy said the transaction transfers to Mitsubishi all equity interests in two of its subsidiaries, along with a newly named upstream and midstream operating company, Adamas Energy, which is wholly owned by Mitsubishi.
Aethon said it will continue to operate as a private investment company and owner-operator of oil and natural gas fields along with sustainable energy projects. The Dallas-based company said it also plans to acquire a 25% nonoperating working interest in the assets it has sold to Mitsubishi. The repurchase of those assets is subject to regulatory approvals and the availability of financing.
“Aethon is pleased to continue our partnership with Mitsubishi through our global strategic alliance and we look forward to exploring new opportunities together. With our experienced team, significant investment capacity, and proven approach to value creation, we believe Aethon is well positioned to pursue a wide range of compelling opportunities across energy and infrastructure,” Gordon Huddleston, president and CEO of Adamas,” said in a statement.
Prior to the acquisition, Aethon was the largest privately held gas producer in the Haynesville Shale and North America.
Earlier this month, energy analytics firm Enverus ranked Aethon as the third-largest private producer in the US based on total energy output, behind Continental Resources and Mewbourne Oil. The company averaged 2.65 Bcf/D, or 443,000 BOE/D, of production in 2025.
The Mitsubishi acquisition follows other recent moves by Japanese companies into the US shale gas sector, which have been viewed as broad efforts to secure long-term liquefied natural gas (LNG) supplies.
In 2025, Japanese power generation firm JERA signed what was described at the time as the largest LNG offtake agreement ever executed by a single buyer, while also acquiring a producing Haynesville gas asset for $1.5 billion.
Also in 2025, Tokyo Gas joined Castleton Commodities International in acquiring a 70% interest in Chevron's East Texas gas business. That transaction followed Tokyo Gas' $2.7-billion acquisition of Haynesville producer Rockcliff Energy in 2023.