Amendment No. 9 to the Schedule 13D for GeneDx Holdings Corp. updates ownership and voting information for a group led by Eli Casdin and Keith Meister. The filing shows that Eli Casdin beneficially owns 3,599,671 shares (12.4%) and Keith A. Meister beneficially owns 3,630,826 shares (12.5%) of the Class A common stock, based on 28,726,248 shares outstanding as of July 24, 2025.
The filing attributes 3,007,164 shares (10.5%) to Casdin Partners Master Fund, L.P. and 3,058,629 shares (10.6%) to investment funds advised by Corvex Management LP. Certain reported holdings include shares issuable upon exercise of warrants and vested options (including 204,141 private placement warrants exercisable at $379.50 per share). The funds for the purchases listed were from the working capital of Casdin Partners Master Fund, L.P. Transactions in the past 60 days are reported in Exhibit B. The Amendment supplements earlier Schedule 13D filings and includes a joint filing agreement and transaction schedule as exhibits.