Alta Mesa Resources, Inc. (NASDAQ: SRUN), originally organized as Silver Run Acquisition Corporation II, is a blank check company incorporated in Delaware and sponsored by Riverstone Holdings LLC, the New York-based energy-focused private equity firm. The SPAC completed its initial public offering in 2017, targeting acquisition opportunities in the upstream oil and gas sector. The November 2017 Form 10-Q, filed with the SEC under accession number 0001104659-17-067901, reflects the company's status as a pre-combination entity during the active search phase of its lifecycle. The vehicle ultimately pursued assets in the Oklahoma STACK play through a proposed business combination. Sign up at SpacDesk for complete filing history, sponsor profiles, and deal timelines on SRUN and hundreds of other SPACs.