STANDARD BIOTOOLS CFO reports tax share withholding

STANDARD BIOTOOLS INC.

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Form Type

Rhea-AI Filing Summary

STANDARD BIOTOOLS INC. Chief Financial Officer Hanjoon Alex Kim reported a routine tax-related share disposition. On May 20, 2026, 18,871 shares of common stock were withheld to cover tax obligations from vesting restricted stock units. After this non-market transaction, he directly holds 2,760,530 shares.

Insider Trade Summary

Exercise Price or Tax Liability: 18,871 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	18,871	$1.00	$19K

Holdings After Transaction: Common Stock — 2,760,530 shares (Direct)

Footnotes (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, March 21, 2025 and March 20, 2026, which grants were originally reported on Form 4s filed with the U.S. Securities and Exchange Commission on May 21, 2024, March 24, 2025 and April 8, 2026, respectively.

Key Figures

Shares withheld for taxes: 18,871 shares Deemed price per share: $1.00 per share Shares held after transaction: 2,760,530 shares +1 more

4 metrics

Shares withheld for taxes 18,871 shares Tax withholding disposition on May 20, 2026

Deemed price per share $1.00 per share Value used for tax-withholding disposition

Shares held after transaction 2,760,530 shares Direct common stock ownership following disposition

Tax-withholding transactions 1 transaction, 18,871 shares Summary of tax-withholding activity in this filing

Key Terms

restricted stock units, tax withholding obligations, Form 4

3 terms

restricted stock units financial

"upon the vesting of restricted stock units granted to the reporting person"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"withheld from the reporting person to satisfy the tax withholding obligations that arose"

Form 4 regulatory

"originally reported on Form 4s filed with the U.S. Securities and Exchange Commission"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What did STANDARD BIOTOOLS (LAB) CFO report on this Form 4?

The CFO reported a tax-related share disposition. On May 20, 2026, 18,871 common shares were withheld to satisfy tax obligations from vesting restricted stock units, rather than being sold in the open market.

How many STANDARD BIOTOOLS (LAB) shares were withheld for taxes?

A total of 18,871 common shares were withheld. These shares covered tax withholding obligations arising from the vesting of restricted stock units granted in May 2024, March 2025, and March 2026.

Does this STANDARD BIOTOOLS (LAB) Form 4 show an open-market sale?

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. Shares were delivered to cover tax obligations triggered when restricted stock units vested, a common administrative transaction for equity compensation.

How many STANDARD BIOTOOLS (LAB) shares does the CFO hold after the transaction?

Following the tax-withholding disposition, the CFO directly holds 2,760,530 common shares. This figure reflects his remaining ownership after 18,871 shares were withheld to satisfy equity-related tax obligations on vested restricted stock units.

What triggered the tax withholding in this STANDARD BIOTOOLS (LAB) filing?

The tax withholding was triggered by vesting of restricted stock units. These RSUs were originally granted on May 20, 2024, March 21, 2025 and March 20, 2026, with the resulting obligations settled by delivering 18,871 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/22/2026 - 05:20 PM

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.

50 MILK STREET, 10TH FLOOR

(Street)

BOSTON

MASSACHUSETTS

02109

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/20/2026		F		18,871⁽¹⁾	D	$1	2,760,530	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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, March 21, 2025 and March 20, 2026, which grants were originally reported on Form 4s filed with the U.S. Securities and Exchange Commission on May 21, 2024, March 24, 2025 and April 8, 2026, respectively.

	/s/ Hanjoon Alex Kim by Tomone Tanaka, Attorney-in-Fact	05/22/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR