SoundHound AI, Inc., the conversational voice artificial intelligence company, filed an S-4MEF registration statement on September 4, 2026, under accession number 0001213900-26-097412, associated with ticker ATSPT. The S-4MEF registers additional securities pursuant to Rule 462(b) in connection with an existing S-4 filing. SoundHound AI completed its business combination with Archimedes Tech SPAC Partners Co. (ATSP) in April 2022, becoming a publicly traded entity in the artificial intelligence and voice technology sector. Archimedes Tech SPAC Partners, sponsored by Archimedes Tech SPAC Partners Holdings LLC, priced its IPO in 2021 with a mandate to target technology-sector acquisitions. For full deal timelines, warrant data, and SPAC analytics, sign up for a free account at SpacDesk.