Standard Biotools CFO has 12,739 LAB shares withheld for taxes

Standard Biotools Inc. (LAB) reported an insider equity transaction by its Chief Financial Officer on 11/20/2025.

Rhea-AI Filing Summary

Standard Biotools Inc. (LAB) reported an insider equity transaction by its Chief Financial Officer on 11/20/2025. The Form 4 shows that 12,739 shares of common stock were withheld at a price of $1.28 per share to cover tax obligations arising from the vesting of restricted stock units previously granted on May 20, 2024 and March 21, 2025. After this tax withholding transaction, the reporting person beneficially owns 2,415,086 shares of Standard Biotools common stock, held directly.

Insider Trade Summary

Exercise Price or Tax Liability: 12,739 shares

Exercise Price or Tax Liability 1 txn

Insider Kim Hanjoon Alex

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	12,739	$1.28	$16K

Holdings After Transaction: Common Stock — 2,415,086 shares (Direct)

Footnotes (1)

1. F1. The shares were withheld from the reporting person to satisfy the tax withholding obligations that arose upon the vesting of restricted stock units granted to the reporting person on May 20, 2024 and March 21, 2025, which grants were originally reported on Form 4s filed with the U.S. Securities and Exchange Commission on May 21, 2024 and March 24, 2025, respectively.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did STANDARD BIOTOOLS INC. (LAB) report on this Form 4?

The filing reports that the Chief Financial Officer had 12,739 shares of common stock withheld on 11/20/2025 to satisfy tax withholding related to vesting restricted stock units.

What is the role of the reporting person in STANDARD BIOTOOLS INC. (LAB)?

The reporting person is an officer of Standard Biotools Inc., serving as the company’s Chief Financial Officer.

How many STANDARD BIOTOOLS INC. (LAB) shares does the CFO own after this transaction?

Following the reported transaction, the Chief Financial Officer beneficially owns 2,415,086 shares of Standard Biotools Inc. common stock, held directly.

Why were 12,739 STANDARD BIOTOOLS INC. shares withheld in this Form 4?

The 12,739 shares were withheld to satisfy tax withholding obligations that arose when restricted stock units granted on May 20, 2024 and March 21, 2025 vested.

What transaction code is used in this STANDARD BIOTOOLS INC. (LAB) Form 4?

The transaction is reported with code "F", which indicates shares were withheld to pay taxes in connection with the vesting of equity awards.

Is this STANDARD BIOTOOLS INC. (LAB) Form 4 filed by one or multiple reporting persons?

This Form 4 is indicated as being filed by one reporting person, not by a group.

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Accepted by SEC EDGAR 11/24/2025 - 05:04 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Kim Hanjoon Alex

(Last) (First) (Middle)

C/O STANDARD BIOTOOLS INC.

2 TOWER PLACE, STE 2000

(Street)

SOUTH SAN FRANCISCO CA 94080

(City) (State) (Zip)

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 Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/20/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	11/20/2025		F		12,739(1)	D	$1.28	2,415,086	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. The shares were withheld from the reporting person to satisfy the tax withholding obligations that arose upon the vesting of restricted stock units granted to the reporting person on May 20, 2024 and March 21, 2025, which grants were originally reported on Form 4s filed with the U.S. Securities and Exchange Commission on May 21, 2024 and March 24, 2025, respectively.

	/s/ Hanjoon Alex Kim by Tomone Tanaka, Attorney-in-Fact	11/24/2025
	** Signature of Reporting Person	Date
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.