Casdin Partners GP, LLC 4

What Happened
Casdin Capital, LLC (reported as a 10% owner) made three open-market purchases of GeneDx Holdings Corp. (WGS) common stock on May 18–20, 2026, acquiring a total of 500,000 shares for approximately $21.46 million. The trades: 175,000 shares on 5/18 at a weighted avg $42.55 ($7.45M), 185,000 shares on 5/19 at a weighted avg $42.60 ($7.88M), and 140,000 shares on 5/20 at a weighted avg $43.81 (~$6.13M). These were purchases (code P), not sales.

Key Details

• Transaction dates and reported weighted-average prices:
  • 2026-05-18: 175,000 shares @ $42.55 (weighted avg; range $42.4573–$42.9153)
  • 2026-05-19: 185,000 shares @ $42.60 (weighted avg; range $42.1118–$42.6898)
  • 2026-05-20: 140,000 shares @ $43.81 (weighted avg; range $43.6287–$44.3384)
• Total acquired: 500,000 shares for ~$21,459,735.
• Shares owned after transaction: Not specified in the provided excerpt.
• Filing timeliness: Form 4 filed 2026-05-20 reporting trades from 5/18–5/20; no late filing indicated.
• Notable footnotes:
  • Multiple-weighted price ranges disclosed for each purchase (reporting persons will provide breakdown on request).
  • Securities are directly owned by Casdin Partners Master Fund, L.P.; Casdin Capital, GP and Eli Casdin may be deemed indirect beneficial owners.
  • Reporting persons disclaim beneficial ownership except to the extent of pecuniary interest.

Context

• These were open-market/private purchases by an institutional/affiliate group (a reported 10% owner and related entities), not routine executive trading. Purchases by large holders can be of interest to investors, but the filing does not state motivation.
• The report clarifies indirect ownership structure (Master Fund, GP, and Eli Casdin) and includes a standard disclaimer of beneficial ownership.