Silver Run Acquisition Corporation II, trading under the ticker SRUN, was a blank-check company sponsored by Riverstone Holdings, a private equity firm with a focus on energy and power investments. The SPAC completed its initial public offering in 2017 with a stated focus on the upstream oil and gas sector. It subsequently merged with Alta Mesa Holdings in 2018, combining Alta Mesa's oil and gas assets with midstream operator Kingfisher Midstream. On February 19, 2020, SRUN filed a Form 15-12B with the SEC to deregister its class of securities under Section 12(b) of the Securities Exchange Act, reflecting the post-combination wind-down of the SPAC entity. Sign up at SpacDesk for the full filing history, sponsor profile, and deal-level analytics on SRUN and thousands of other SPAC transactions.