Stronghold Energy II Announces Equity Commitment of Up to $150 Million from Warburg Pincus MIDLAND, Texas and NEW YORK, January 19, 2018-- Stronghold Energy II Holdings, LLC (“Stronghold” or “the Company”), a newly formed oil and gas exploration and production company, today announced that it has received a line of equity financing of up to $150 million from funds affiliated with Warburg Pincus, a global private equity firm focused on growth investing.