Casdin Partners GP, LLC 4

What Happened
Casdin Capital, LLC — reported as a 10% owner/related reporting person — entered into cash‑settled swap agreements that provide economic exposure to a total of 850,000 notional shares of GeneDx (WGS) across three transactions (May 7, May 8 and May 11, 2026). The swaps reference: 500,000 notional shares at $38.1543/share ($19,077,150); 300,000 notional shares at $41.0261/share ($12,307,830); and 50,000 notional shares at $39.6602/share (~$1,983,010). Combined notional exposure is roughly $33,367,990. These are cash‑settled swap agreements (derivatives) that give economic returns similar to owning the stock but do not convey voting or disposition rights.

Key Details

• Transaction dates and reference prices/values:
  • 2026‑05‑07: swap exposure to 500,000 notional shares @ $38.1543 ≈ $19,077,150 (Footnote F1)
  • 2026‑05‑08: swap exposure to 300,000 notional shares @ $41.0261 ≈ $12,307,830 (Footnote F3)
  • 2026‑05‑11: swap exposure to 50,000 notional shares @ $39.6602 ≈ $1,983,010 (Footnote F4)
• Total notional exposure: 850,000 shares, ~ $33.37 million aggregate economic exposure.
• Shares owned after transaction: Not specified; the filers disclaim beneficial ownership except to extent of any pecuniary interest (see Remarks).
• Notable footnotes: swaps are cash‑settled and do not provide power to vote or sell the underlying securities; swaps are held by Casdin Partners Master Fund, L.P. and reported indirectly by Casdin Capital, Casdin Partners GP, LLC, and Eli Casdin (F1–F4).
• Filing timeliness: Reported on Form 4 filed 2026‑05‑11 for transactions May 7–11 — filing appears to be within required reporting window (timely).

Context

• These are derivative (swap) transactions giving economic exposure, not purchases of actual shares; therefore they do not change voting control or direct ownership of WGS stock.
• This filing reflects institutional activity by a reported 10% owner entity and related parties, not an individual executive trade.