RA Capital Management Increases Reported Beneficial Ownership in Vor Biopharma Inc. to 19.9% via Amendment No. 15

RA Capital Management, L.P., alongside Peter Kolchinsky and Rajeev Shah, filed Amendment No. 15 to their Schedule 13D for Vor Biopharma Inc. (VOR). As of April 10, 2026, the reporting persons beneficially own 12,554,642 shares, representing 19.9% of the company. This ownership includes 3,935,608 shares held directly by RA Capital Healthcare Fund, L.P., and various warrants and stock options. The filing details several open market sales conducted between April 8 and April 10, 2026, totaling over 620,000 shares at prices ranging from $15.75 to $16.91. Despite these recent sales, the total share count increased from the previously reported 12,399,706 shares due to the inclusion of exercisable warrants and options. Beneficial ownership remains capped at 19.9% due to contractual blockers in the pre-funded warrants. RA Capital serves as the investment adviser for the Fund, with Kolchinsky and Shah acting as controlling persons.