The investment made the Oklahoma-based company the fifth oil and gas exploration and production company in Trilantic’s portfolio according to a report by LBO Wire.
It said Trilantic put up $225m for the transaction, with First Reserve adding the remaining $125m.
Last month Crestwood Holdings, First Reserve’s oil and gas gathering, transmission and distribution arm, bought a swathe of Trilantic’s Antero Resources Appalachian’s shale gas extracting system.
The deal includes an earn-out which will provide Antero extra payments of up to $40m depending on average production levels over the next two years.
Trilantic was formed in 2009 by five founding partners who all worked together at Lehman Brothers Merchant Banking.
The five bought LBMB from the Lehman Brothers estate and continued its work, which amounts to more than $7bn of raised equity capital since 1989.
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