Sec Form 4 Filing - Kim Hanjoon Alex @ STANDARD BIOTOOLS INC. - 2024-04-04

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Kim Hanjoon Alex 2. Issuer Name and Ticker or Trading Symbol STANDARD BIOTOOLS INC. [ LAB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Operating Officer (Last) (First) (Middle) C/O STANDARD BIOTOOLS INC., 2 TOWER PLACE, STE 2000 3. Date of Earliest Transaction (MM/DD/YY) 04/04/2024 (Street) SOUTH SAN FRANCISCO, CA94080 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 04/04/2024 M 70,183 A $ 0 140,366 D Common Stock 04/05/2024 A 70,702 ( 1 ) A $ 0 211,068 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 2 ) 04/04/2024 M 70,183 ( 3 ) ( 3 ) Common Stock 70,183 $ 0 140,366 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Kim Hanjoon Alex C/O STANDARD BIOTOOLS INC. 2 TOWER PLACE, STE 2000 SOUTH SAN FRANCISCO, CA94080 Chief Operating Officer Signatures /s/ Hanjoon Alex Kim by Agnieszka Gallagher, Attorney-in-Fact 04/05/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On April 11, 2023, the Reporting Person was granted a target amount of 77,185 performance-based restricted stock units ("RSUs") under the Issuer's 2011 Equity Incentive Plan, as amended. Each RSU represent the right, upon achievement of certain pre-established performance criteria, to receive one share of the Issuer's common stock, subject to vesting conditions. On April 5, 2024, the Board of Directors of the Issuer determined that certain of the RSU performance-based conditions were met resulting in the vesting of 70,702 RSUs as of March 31, 2024. ( 2 )Each RSU represents the contingent right to receive one share of the Issuer's common stock. ( 3 )On April 4, 2022, the Reporting Person was granted 280,732 RSUs, vesting in four equal annual installments beginning on April 4, 2023.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.