Casdin Eli 4

4 · STANDARD BIOTOOLS INC. · Filed Mar 2, 2026

AI-generated summary of this filing

Updated Mar 3, 2026

Standard BioTools (LAB) 10% Owner Eli Casdin Receives RSU Award

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.

Form 4

Period: 2026-02-26

Director10% Owner

Transactions

Holdings

Common Stock
[F3]
(indirect: Casdin Private Growth Equity Fund II, L.P.)
13,939,637
Common Stock
[F4]
(indirect: By Casdin Private Growth Equity Fund, L.P.)
2,744,219
Common Stock
[F5]
(indirect: Casdin Partners Master Fund, L.P.)
72,100,000

Footnotes (5)

[F1]Represents Restricted Stock Units ("RSUs") that vest as to 25% on the last day of the last month of each fiscal quarter of 2026, subject to the Reporting Person's continued service through the applicable vesting date.
[F2]The RSUs were issued to the Reporting Person, who elected to take RSUs in lieu of $62,000 in cash compensation for services as a board member.
[F3]The securities are owned directly by Casdin Private Growth Equity Fund II, L.P. (the "Equity Fund II") and may be deemed to be indirectly beneficially owned by (i) Casdin Capital, LLC ("Casdin"), the investment adviser to the Equity Fund II, and (ii) Eli Casdin, the managing member of Casdin.
[F4]The securities are owned directly by Casdin Private Growth Equity Fund, L.P. (the "Equity Fund") and may be deemed to be indirectly beneficially owned by (i) Casdin, the investment adviser to the Equity Fund, and (ii) Eli Casdin, the managing member of Casdin.
[F5]The securities are owned directly by Casdin Partners Master Fund, L.P. (the "Master Fund") and may be deemed to be indirectly beneficially owned by (i) Casdin, the investment adviser to the Master Fund, (ii) Casdin Partners GP, LLC, the general partner of the Master Fund (the "GP"), and (iii) Eli Casdin, the managing member of Casdin and the GP.

Signature

/s/ Eli Casdin|2026-03-02

1 file