Standard BioTools Inc. (LAB) CFO share withholding for tax obligations

Rhea-AI Filing Summary

STANDARD BIOTOOLS INC. Chief Financial Officer Kim Hanjoon Alex reported a tax-withholding disposition of 202,476 shares of common stock on July 23, 2026, at $0.895 per share to satisfy tax obligations from vested restricted stock units. After this, he directly owned 2,563,054 shares, including 5,000 shares acquired on May 29, 2026 under the Employee Stock Purchase Plan.

Insider Trade Summary

Net Seller: 202,476 shares

Net Sell 1 txn

Insider Kim Hanjoon Alex

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	202,476	$0.895	$181K

Holdings After Transaction: Common Stock — 2,563,054 shares (Direct)

Footnotes (2)

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 August 1, 2025, which grant was originally reported on a Form 4 filed with the U.S. Securities and Exchange Commission on August 5, 2025.
2. F2. Includes 5,000 shares of common stock acquired by the reporting person on May 29, 2026 under the Issuer's Employee Stock Purchase Plan.

Key Figures

Shares withheld for taxes: 202,476 shares Per-share value of withheld shares: $0.895 per share Post-transaction holdings: 2,563,054 shares +2 more

5 metrics

Shares withheld for taxes 202,476 shares Common stock withheld on July 23, 2026 for tax withholding obligations

Per-share value of withheld shares $0.895 per share Valuation applied to 202,476 withheld shares

Post-transaction holdings 2,563,054 shares CFO’s directly owned common stock after the transaction

ESPP acquisition 5,000 shares Shares acquired on May 29, 2026 under the Employee Stock Purchase Plan

Tax-related transaction size marker 1 transaction, 202,476 shares ExercisePriceOrTaxLiabilityShares in transaction summary

Key Terms

restricted stock units, Employee Stock Purchase Plan, tax withholding obligations, tax-withholding disposition

4 terms

restricted stock units financial

"tax withholding obligations that arose upon the vesting of restricted stock units granted"

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.

Employee Stock Purchase Plan financial

"shares of common stock acquired by the reporting person on May 29, 2026 under the Issuer's Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

tax withholding obligations financial

"shares were withheld from the reporting person to satisfy the tax withholding obligations that arose upon the vesting"

tax-withholding disposition financial

"transaction_action: tax-withholding disposition for payment of tax liability"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/27/2026 - 07:29 PM Accepted by SEC EDGAR 07/27/2026 - 07:28 PM Learn about SEC filing dates

FAQ

What insider transaction did STANDARD BIOTOOLS INC. (LAB) report for its CFO?

STANDARD BIOTOOLS INC. CFO Kim Hanjoon Alex reported a tax-withholding disposition of shares. On July 23, 2026, 202,476 common shares were withheld at $0.895 each to cover tax obligations arising from the vesting of restricted stock units.

How many STANDARD BIOTOOLS INC. (LAB) shares were withheld for taxes in this Form 4?

The filing reports that 202,476 shares of STANDARD BIOTOOLS INC. common stock were withheld. These shares covered tax withholding obligations triggered when previously granted restricted stock units vested, rather than representing an open-market sale by the CFO.

What is the CFO’s STANDARD BIOTOOLS INC. (LAB) share ownership after this transaction?

Following the reported transaction, the CFO directly owned 2,563,054 common shares of STANDARD BIOTOOLS INC. This total includes 5,000 shares acquired on May 29, 2026 through the company’s Employee Stock Purchase Plan.

At what price were the withheld STANDARD BIOTOOLS INC. (LAB) shares valued?

The withheld shares were valued at $0.895 per share. This price applies to the 202,476 common shares delivered or withheld to satisfy the CFO’s tax liability associated with the vesting of restricted stock units granted on August 1, 2025.

What role did restricted stock units play in this STANDARD BIOTOOLS INC. (LAB) Form 4?

The tax-withholding event stemmed from restricted stock units granted on August 1, 2025. When those RSUs vested, 202,476 shares of common stock were withheld from the CFO to satisfy related tax obligations, as described in the Form 4 footnotes.

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)
07/23/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/23/2026		F		202,476(1)	D	$0.895	2,563,054(2)	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 August 1, 2025, which grant was originally reported on a Form 4 filed with the U.S. Securities and Exchange Commission on August 5, 2025.

2. Includes 5,000 shares of common stock acquired by the reporting person on May 29, 2026 under the Issuer's Employee Stock Purchase Plan.

	/s/ Hanjoon Alex Kim by Tomone Tanaka, Attorney-in-Fact	07/27/2026
	** 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)