SEC Form 4 · accession 0001193125-26-279828

STANDARD BIOTOOLS INC. · LAB

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Eli Casdin

Director · 10% Owner

Period of report

Jun 18, 2026

Accepted (ET)

Jun 23, 2026 · 5:41 pm EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0001162194

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1	Jun 18, 2026	A	99,116	$0.00	A	3,053,169	D
Common Stock^F2	holding	—	—		—	13,939,637	I	Casdin Private Growth Equity Fund II, L.P.
Common Stock^F3	holding	—	—		—	2,744,219	I	By Casdin Private Growth Equity Fund, L.P.
Common Stock^F4	holding	—	—		—	72,100,000	I	Casdin Partners Master Fund, L.P.

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Stock Option (Right to buy)^F5	$0.8297	Jun 18, 2026	A	175,923	A	—	Jun 18, 2036	Common Stock	175,923	175,923	D

Explanation of responses

F1Represents Restricted Stock Units ("RSUs") that vest in full on the earlier to occur of June 18, 2027 and one day prior to the date of the Company's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date. Each RSU represents the right to receive one share of common stock upon vesting.
F2The 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.
F3The 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.
F4The 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.
F5The Option becomes exercisable in twelve equal monthly installments beginning on July 18, 2026, subject to the Reporting Person's continued service through the applicable vesting date.

Remarks

The Reporting Person disclaims beneficial ownership in the securities reported on this Form 4 except to the extent of his pecuniary interest, if any, therein, and this report shall not be deemed to be an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.