Alta Mesa Resources, Inc. (Nasdaq: SRUN) was formed through the business combination of Silver Run Acquisition Corporation II, a blank-check company sponsored by Riverstone Holdings LLC that completed its IPO in 2017, with Alta Mesa Holdings, LP and Kingfisher Midstream, LLC, upstream and midstream energy operators active in Oklahoma's STACK play. The de-SPAC transaction closed in February 2018, creating a publicly traded oil and gas company with both exploration and production and gathering and processing assets. By September 2019, the combined company filed for Chapter 11 bankruptcy protection amid sustained commodity price pressure, with this 8-K representing the company's formal public disclosure of those proceedings. For comprehensive filing histories, sponsor profiles, and post-merger performance data on Alta Mesa Resources and the broader SPAC universe, sign up for full access at SpacDesk.