CERO THERAPEUTICS HOLDINGS, INC.

Cero Therapeutics Holdings, Inc. filed an S-1 registration statement with the SEC on December 5, 2025, under the ticker PBAX — the original Nasdaq symbol of Phoenix Biotech Acquisition Corp, the healthcare-focused blank-check company sponsored by Phoenix Biotech Sponsor, LLC. Phoenix Biotech Acquisition Corp completed its IPO in 2021 targeting healthcare and life sciences opportunities before completing its de-SPAC business combination with Cero Therapeutics, a clinical-stage biopharmaceutical company developing engineered T cell receptor therapies for oncology indications. The December 2025 S-1 represents a post-combination registration filing for the resulting public entity. Sign up at SpacDesk for full data on this filing, sponsor history, and every SPAC transaction in our database.