Cayson Acquisition Corp, trading under the ticker CAPNU, is a blank-check company that filed a DEFA14A — definitive additional proxy soliciting materials — with the SEC on March 13, 2026, under accession number 0001493152-26-009953. The DEFA14A filing indicates active proxy proceedings, most commonly associated with a shareholder vote on a proposed business combination or a term extension. The company is structured as a special purpose acquisition vehicle targeting an acquisition in its designated sector. Investors and analysts tracking SPAC proxy activity can monitor Cayson's filings and deal status as developments unfold. Sign up at SpacDesk for full filing history, sponsor data, and real-time alerts on Cayson Acquisition Corp and hundreds of other active SPACs.