BTRS Holdings Inc., formed through the business combination of South Mountain Merger Corp (Nasdaq: SMMC) and Billtrust, filed an 8-K with the SEC on January 14, 2021, marking a milestone in the SPAC's path to completing its de-SPAC transaction. South Mountain Merger Corp, sponsored by South Mountain Equity Partners, completed its IPO in 2020 and targeted the financial technology sector, specifically B2B accounts receivable automation and payment solutions. Following the merger close, the combined entity operated under the BTRS ticker on Nasdaq, with Billtrust continuing its position as a provider of cloud-based billing and payment software for enterprise clients. Visit SpacDesk and sign up for full filing history, sponsor profiles, and deal analytics on SMMC and hundreds of other SPACs.