FirstMark Horizon Acquisition Corp. (Nasdaq: FMAC) is a blank-check company sponsored by FirstMark Capital, a New York-based technology-focused venture capital firm known for backing consumer and enterprise software companies. FMAC completed its initial public offering in March 2021 with a mandate to pursue a business combination in the technology sector. In December 2021, the company filed an amended quarterly report on Form 10-Q/A with the Securities and Exchange Commission. By that point, FMAC had already announced a definitive business combination agreement with Starry, Inc., a fixed wireless broadband internet provider; the transaction subsequently closed in March 2022. Sign up for SpacDesk to access full filing history, deal timelines, and data coverage for FMAC and hundreds of other SPACs.