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  4. [Form 4] STANDARD BIOTOOLS INC. Insider Trading Activity

Standard BioTools (LAB) CEO uses 97K shares to pay taxes

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

STANDARD BIOTOOLS INC. (LAB) reported that President & CEO Michael Egholm had 97,627 shares of common stock withheld on August 20, 2026 to satisfy tax withholding obligations arising from the vesting of previously granted restricted stock units. Following this tax-withholding disposition, he directly holds 6,137,704 shares of common stock.

Positive

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Negative

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Insider Egholm Michael
Role President & CEO
Type Security Shares Price Value
Tax Withholding Common Stock F1 97,627 $0.672 $66K
Holdings After Transaction: Common Stock — 6,137,704 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, 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.
Shares withheld for taxes 97,627 shares of Common Stock Withheld on August 20, 2026 to satisfy tax withholding obligations
Transaction price per share $0.6720 per share Price reported for the tax-withholding disposition of 97,627 shares
Shares held after transaction 6,137,704 shares of Common Stock Direct holdings of Michael Egholm following the August 20, 2026 transaction
ExercisePriceOrTaxLiabilityShares 97,627 shares Shares involved in payment of tax liability by delivering or withholding securities
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.
tax withholding obligations financial
"shares were withheld from the reporting person to satisfy the tax withholding obligations"
transaction code F regulatory
"transaction code F describes Payment of tax liability by delivering or withholding"

FAQ

What insider transaction did LAB report for Michael Egholm on this Form 4?
STANDARD BIOTOOLS INC. reported that President & CEO Michael Egholm had 97,627 shares of common stock withheld on August 20, 2026 to cover tax withholding obligations related to vesting restricted stock units.

Was the August 20, 2026 LAB Form 4 transaction a market sale by Michael Egholm?
No. The Form 4 states the 97,627 shares were withheld to pay tax withholding obligations upon vesting of restricted stock units, reported under transaction code F, rather than an open-market sale.

How many LAB shares does Michael Egholm hold after this Form 4 transaction?
After the tax-withholding disposition, Michael Egholm directly holds 6,137,704 shares of STANDARD BIOTOOLS INC. common stock, as reported in the Form 4 under total shares following the transaction.

What price per share is associated with the LAB shares withheld for taxes?
The Form 4 reports a transaction price of $0.6720 per share for the 97,627 common shares withheld to satisfy tax withholding obligations tied to vesting restricted stock units.

Were the LAB Form 4 transactions under a Rule 10b5-1 trading plan?
No. The filing’s Rule 10b5-1 checkbox is not checked, and there is no footnote stating that the August 20, 2026 tax-withholding transaction was executed under a Rule 10b5-1 trading plan.

What awards led to the LAB tax-withholding share disposition?
The footnote explains the shares were withheld to satisfy taxes from vesting of restricted stock units granted to Michael Egholm on May 20, 2024, March 21, 2025, and March 20, 2026.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
President & CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/20/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/20/2026F97,627(1)D$0.6726,137,704D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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, 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/ Michael Egholm by Tomone Tanaka, Attorney-in-Fact08/24/2026
** Signature of Reporting PersonDate
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