Casdin Eli 4

What Happened

• Eli Casdin, a reported 10% owner (through affiliated funds) and managing member of Casdin, received an award of 52,991 restricted stock units (RSUs) on 2026-02-26. The RSUs are reported at a grant value of $1.17 per share, totaling $61,999. This grant was issued in lieu of ~$62,000 in cash compensation for board service.

Key Details

• Transaction type/date/value: Award of 52,991 RSUs on 2026-02-26 at $1.17/share — total reported value $61,999.
• Vesting: RSUs vest 25% on the last day of the last month of each fiscal quarter of 2026, subject to continued service (footnote F1).
• Compensation election: RSUs were taken in lieu of $62,000 cash board compensation (footnote F2).
• Ownership/beneficial interest: Securities are held directly by affiliated investment funds (Casdin Private Growth Equity Fund II, L.P.; Casdin Private Growth Equity Fund, L.P.; Casdin Partners Master Fund, L.P.) and may be indirectly beneficially owned by Casdin Capital, LLC and Eli Casdin (footnotes F3–F5). The reporting person disclaims beneficial ownership except to the extent of any pecuniary interest.
• Shares owned after transaction: Not specified in this filing.
• Filing timeliness: Form 4 filed 2026-03-02 for a 2026-02-26 grant — appears timely (filed within the Section 16 two-business-day reporting window).

Context

• This was an award (compensation) — not a market purchase or sale — so it reflects compensation structure rather than an open-market investment decision. Vesting is time-based and contingent on continued service, so shares will only convert to owned stock as they vest. For a 10% owner, reported holdings often reflect fund-level positions and compensation arrangements rather than direct personal trading.