Silver Run Acquisition Corporation II, which traded on Nasdaq under the ticker SRUN, was a blank-check company sponsored by Riverstone Holdings that completed its initial public offering in 2017 targeting the energy sector. The SPAC pursued upstream oil and gas opportunities and announced a business combination with Alta Mesa Holdings, LP and Kingfisher Midstream, LLC, both focused on the STACK play in Oklahoma. The February 2018 8-K filing reflects activity surrounding the closing of that transaction, through which the combined entity was reorganized as Alta Mesa Resources, Inc. under Delaware incorporation. The deal marked one of the larger energy-focused SPAC combinations of that vintage. Sign up at SpacDesk for full filing history, deal timelines, and sponsor data on SRUN and hundreds of other SPACs.