Thunderstone Acquisition Corp (Nasdaq: TDST) is a blank-check company that filed an amended S-1/A registration statement with the SEC on September 22, 2025, accession number 0001213900-25-090169, signaling active progress through the IPO registration process in 2025. As a special purpose acquisition company, Thunderstone is structured to raise capital in the public markets with the intent of identifying and completing a business combination with a target company. The S-1/A amendment reflects ongoing regulatory review and disclosure refinements standard to the SPAC pre-effective period. Sponsor identity and stated sector focus are detailed in the full filing record. Sign up at SpacDesk for complete data on Thunderstone Acquisition Corp, including sponsor profiles, filing timelines, and deal-stage analytics across the SPAC market.