Picton Mahoney Asset Management Reports 4.78% Stake in GP-ACT III Acquisition Corp (GPAT)

Picton Mahoney Asset Management filed a Schedule 13G/A on April 27, 2026, reporting a 4.78% stake in GP-ACT III Acquisition Corp (GPAT). The filing indicates that the investment manager now beneficially owns 1,375,000 Class A Ordinary Shares of the issuer. This position represents an increase from the previously reported 0.0% ownership, crossing the threshold for reporting. Picton Mahoney Asset Management, a Canadian-based investment fund manager, holds sole voting and dispositive power over all 1,375,000 shares. The calculation of the ownership percentage is based on 28,750,000 Class A ordinary shares outstanding as of March 26, 2026, according to the issuer's most recent Form 10-K. As the ownership level has fallen below the 5% threshold since the initial trigger, the filer has checked the box in Item 5 indicating they now own 5% or less of the class of securities. The event triggering this specific amendment occurred on March 31, 2026.