Wide angle of blue steel pipelines and red handwheels in rural area.
Our Work

Latham Advises Aethon in Completed Sale of Haynesville Business to Mitsubishi

July 15, 2026
A multidisciplinary team advised Aethon on the US$7.5 billion sale.

Aethon Energy (Aethon) has announced that it has successfully completed the previously announced sale by Aethon’s existing stakeholders, including Ontario Teachers’ Pension Plan, Redbird Capital, and Aethon’s founders, of 100% of the equity interests in Aethon III LLC, Aethon United LP, and related entities and interests to Mitsubishi Corporation (Mitsubishi). The transaction is Mitsubishi’s largest-ever acquisition.

Latham & Watkins advised Aethon on the transaction with a corporate deal team led by John Giouroukakis, Clayton Heery, Ryan Maierson, Justin T. Stolte, and counsel James Robertson, with associate Armaan Bhimani. Advice was also provided on capital markets matters by David Miller; on tax matters by Christine Mainguy, with associate Dominick Constantino; on finance matters by Scott Ollivierre; on benefits matters by David Della Rocca and counsel Laura Szarmach; on energy regulatory matters by J. Patrick Nevins; on environmental matters by Joshua Marnitz, with associate Reilly Nelson; on data privacy matters by Robert Brown, with associate Stuart Cobb; on oil and gas matters by associates Nathan Zhang and Brock Jones; on intellectual property matters by associate Andrew Abokhair; on antitrust matters by Jason Cruise, Patrick English, and counsel Ngoc Hulbig, with associate Alex Kandalaft and knowledge management lawyer Mary Casale; on regulatory matters by Paul Rosen and Jim Barker, with associate Monica Calce; and on insurance matters by Harrison White.

Endnotes