Standard BioTools (LAB) CEO has 362,625 shares withheld for taxes

Rhea-AI Filing Summary

STANDARD BIOTOOLS INC. President & CEO Michael Egholm reported a tax-withholding disposition of 362,625 shares of common stock on August 3, 2026 at $0.868 per share. The shares were withheld to satisfy tax obligations triggered by vesting restricted stock units granted on August 1, 2025. After this transaction, Egholm directly owns 6,235,331 common shares.

Insider Trade Summary

Net Seller: 362,625 shares

Net Sell 1 txn

Insider Egholm Michael

Role President & CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	362,625	$0.868	$315K

Holdings After Transaction: Common Stock — 6,235,331 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 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.

Key Figures

Shares withheld for taxes: 362,625 shares Tax withholding price: $0.868 per share Shares owned after transaction: 6,235,331 shares

3 metrics

Shares withheld for taxes 362,625 shares Common stock withheld on August 3, 2026 for tax obligations on RSU vesting

Tax withholding price $0.868 per share Per-share value used for the tax-withholding disposition

Shares owned after transaction 6,235,331 shares Direct common stock holdings after August 3, 2026 withholding

Key Terms

restricted stock units, tax withholding obligations, U.S. Securities and Exchange Commission

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

"to satisfy the tax withholding obligations that arose upon the vesting"

U.S. Securities and Exchange Commission regulatory

"on a Form 4 filed with the U.S. Securities and Exchange Commission on August"

The U.S. Securities and Exchange Commission is a government agency responsible for overseeing the stock market and protecting investors. It sets rules to ensure that companies share truthful information and that trading is fair, helping to maintain trust in the financial system. This oversight is important because it helps prevent fraud and ensures that investors can make informed decisions.

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 08/04/2026 - 06:01 PM Accepted by SEC EDGAR 08/04/2026 - 06:01 PM Learn about SEC filing dates

FAQ

What insider transaction did STANDARD BIOTOOLS (LAB) CEO Michael Egholm report?

Michael Egholm reported a tax-withholding disposition of shares rather than an open-market trade. In this event, the company withheld a portion of his vested RSU shares to cover tax obligations associated with that vesting, and he retained the remaining shares.

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

A total of 362,625 Standard BioTools common shares were withheld from Michael Egholm. These shares were used to satisfy his tax withholding obligations arising when previously granted restricted stock units vested, rather than being sold on the open market.

At what price were the withheld LAB shares valued in this transaction?

The withheld shares were valued at $0.868 per share for the tax-withholding disposition. This per-share amount is used to determine the value of shares delivered to cover the tax liability created by the vesting of restricted stock units granted on August 1, 2025.

How many STANDARD BIOTOOLS (LAB) shares does Michael Egholm own after this Form 4 transaction?

Following the tax-withholding event, Michael Egholm directly owns 6,235,331 Standard BioTools common shares. This figure reflects his holdings after 362,625 shares were withheld to cover taxes tied to the vesting of a prior restricted stock unit grant.

Was the LAB Form 4 transaction reported under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not selected, indicating this tax-withholding disposition was not affirmatively reported as executed under a pre-arranged Rule 10b5-1 trading plan. The event instead reflects automatic withholding linked to RSU vesting-related tax obligations.

What triggered the tax-withholding disposition reported for STANDARD BIOTOOLS (LAB)?

The disposition was triggered by the vesting of restricted stock units granted to Michael Egholm on August 1, 2025. When these RSUs vested, the company withheld 362,625 shares to satisfy Egholm’s associated tax withholding obligations with the U.S. tax authorities.

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^*

Egholm Michael

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026

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	08/03/2026		F		362,625(1)	D	$0.868	6,235,331	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.

	/s/ Michael Egholm by Sam Silver, Attorney-in-Fact	08/04/2026
	** 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)