BTRS Holdings Inc. (Nasdaq: BTRS) is the holding company for Billtrust, a cloud-based platform serving the business-to-business accounts receivable automation and integrated payments market. The company entered public markets through a de-SPAC merger with South Mountain Merger Corp., a blank check vehicle sponsored by South Mountain Merger Sponsor LLC, which completed its SPAC IPO in 2019 with a focus on financial technology targets. The business combination closed in January 2021, bringing Billtrust into the public markets on Nasdaq under the BTRS ticker. The company operated within the broader B2B fintech and order-to-cash software sector. Sign up for SpacDesk to access complete filing histories, sponsor profiles, and deal analytics on BTRS and hundreds of other SPAC transactions.