STANDARD BIOTOOLS INC. — Director's Dealing 2024

May 23, 2024

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: STANDARD BIOTOOLS INC. (LAB)
CIK: 0001162194
Period of Report: 2024-05-20

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2024-05-20	Common Stock	P	100000	$2.5813	Acquired	45475821	Indirect
2024-05-21	Common Stock	P	350000	$2.5598	Acquired	45825821	Indirect
2024-05-22	Common Stock	P	150000	$2.5849	Acquired	45975821	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	13939637	Indirect
Common Stock	103556	Direct
Common Stock	2744219	Indirect
Common Stock	1200000	Indirect
Common Stock	7548000	Indirect

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were bought in multiple transactions within the range of $2.5791 to $2.5858. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares bought at each separate price within the range set forth in this footnote.

F2: 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.

F3: The price reported in Column 4 is a weighted average price. These shares were bought in multiple transactions within the range of $2.5597 to $2.56. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares bought at each separate price within the range set forth in this footnote.

F4: The price reported in Column 4 is a weighted average price. These shares were bought in multiple transactions within the range of $2.5771 to $2.5865. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares bought at each separate price within the range set forth in this footnote.

F5: 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.

F6: The securities are owned directly by Eli Casdin.

F7: 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.

F8: 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.

F9: 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.