BTRS Holdings Inc., which traded under the SPAC ticker SMMC as South Mountain Merger Corp, is a blank-check company that completed its initial public offering in 2020 with a focus on the financial technology sector. Sponsored by South Mountain LLC, the vehicle ultimately combined with Billtrust, a B2B accounts receivable automation and payments platform, with the transaction closing in January 2021 and the combined company operating under the BTRS Holdings name on Nasdaq. The 10-Q filed in May 2020 reflects the company's status as a pre-combination special purpose acquisition vehicle searching for a target in the fintech and business-services space. For complete filing history, transaction timelines, and sponsor data on SMMC and thousands of other SPACs, sign up for full access at SpacDesk.