BTRS Holdings Inc., the combined company formed through the de-SPAC transaction involving South Mountain Merger Corp. (Nasdaq: SMMC), filed an 8-K with the SEC on December 17, 2021. South Mountain Merger Corp. completed its initial public offering in 2020 under the sponsorship of South Mountain Management and subsequently closed its business combination with Billtrust, a B2B accounts receivable automation and payments technology company, in January 2021. Following the transaction, the combined entity traded under the ticker BTRS on Nasdaq, operating in the financial technology and enterprise software sector. The December 2021 filing reflects ongoing public-company reporting obligations of the post-merger entity. Sign up at SpacDesk for full filing history, sponsor profiles, and deal analytics on SMMC and hundreds of other SPAC transactions.