STANDARD BIOTOOLS INC. — Director's Dealing 2024

Mar 20, 2024

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: STANDARD BIOTOOLS INC. (LAB)
CIK: 0001162194
Period of Report: 2024-03-18

Reporting Person: Casdin Partners Master Fund, L.P. (Director, 10% Owner)
Reporting Person: Casdin Capital, LLC (Director, 10% Owner)
Reporting Person: Casdin Partners GP, LLC (Director, 10% Owner)
Reporting Person: Casdin Private Growth Equity Fund II, L.P. (Director)
Reporting Person: Casdin Private Growth Equity Fund II GP, LLC (Director)
Reporting Person: Casdin Partners FO1-MSV, LP (Director)
Reporting Person: Casdin Private Growth Equity Fund, L.P. (Director)
Reporting Person: CASDIN PRIVATE GROWTH EQUITY FUND GP, LLC (Director)
Reporting Person: Casdin Eli (Director, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2024-03-18	Common Stock	A	32525821	$2.75	Acquired	44023749	Indirect
2024-03-18	Common Stock	A	13939637	$2.75	Acquired	13939637	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2024-03-18	Series B-1 Convertible Preferred Stock	$2.75	D	89446	Disposed		Common Stock (32525821)	Indirect
2024-03-18	Series B-1 Convertible Preferred Stock	$2.75	D	38334	Disposed		Common Stock (13939637)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	103556	Direct
Common Stock	2744219	Indirect
Common Stock	1200000	Indirect
Common Stock	7548000	Indirect

Footnotes

F1: 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 Capital, LLC, the investment adviser to the Master Fund ("Casdin"), (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.

F2: 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, the investment adviser to the Equity Fund II, and (ii) Eli Casdin, the managing member of Casdin.

F3: The securities are owned directly by Eli 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 FO1-MSV, LP ("Casdin FO1") and may be deemed to be indirectly beneficially owned by (i) Casdin, the investment adviser to Casdin FO1, (ii) the GP, the general partner of Casdin FO1, and (iii) Eli Casdin, the managing member of Casdin Capital, LLC and Casdin Partners GP, LLC.

F6: The securities are owned directly by CMLS Holdings II LLC ("CMLS Holdings II"). The Board of Managers of CMLS Holdings II includes Eli Casdin, who, as a member of the Board of Managers of CMLS Holdings II, shares voting and investment discretion with respect to the common stock held by CMLS Holdings II.

F7: Each share of the Issuer's Series B-1 Convertible Preferred Stock (the "Series B-1 Preferred Stock") was convertible at the option of the Reporting Person at any time into a number of shares of the Issuer's common stock, par value $0.001 per share.