Simpson Thacher advised Aethon Energy Management LLC (“Aethon Energy Management”) in connection with the entry into definitive documentation with Mitsubishi Corporation (“Mitsubishi”) regarding the sale of its ownership interests in Aethon III LLC, Aethon United LP, and related entities and interests (collectively “Aethon”) and Aethon’s associated management business for a combined purchase price of approximately $5.2 billion plus the assumption of $2.33 billion of debt. Simpson Thacher further advised Aethon Energy Management in connection with the negotiation of an option in favor of Aethon Energy Management’s founder to repurchase up to 25% of Aethon’s upstream and midstream assets, as well as the establishment of a global strategic alliance with Mitsubishi. The transaction is expected to close in Q2 2026.
The Simpson Thacher team included Katy Lukaszewski, Daniel McEntee, John Brannan, Houston Morgan, Cameron Jones, Kevin Hess, Tyler LeBlanc, Wade Landry and Imran Hyder (M&A); Adam Arikat, Andrew Purcell, Ruoxi Zhang and Jacob Kennedy (Tax); Jennifer Ho and Sean Boyle (Regulatory); Karen Kazmerzak and Kelly Karapetyan (Antitrust); Lori Lesser and Ron Ben-Yehuda (Intellectual Property); Erland Modesto (Credit); and Brian Rosenzweig, William Golden, Richie Ragusa, Aarthy Thamodaran and Suzannah Ranzo (Capital Markets).