Quanterix director granted 5,472 shares as board fees

DONNELLY WILLIAM P reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

DONNELLY WILLIAM P reported acquisition or exercise transactions in this Form 4 filing.

Quanterix Corp director William P. Donnelly received 5,472 shares of Common Stock as a grant, valued at $4.34 per share. The award was granted in lieu of cash fees for his service on the company’s Board of Directors and its committees for the second quarter of 2026. After this compensation-related stock grant, he directly holds a total of 160,305 Quanterix common shares.

Insider Trade Summary

Grant/Award: 5,472 shares

Grant/Award 1 txn

Insider DONNELLY WILLIAM P

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	5,472	$4.34	$24K

Holdings After Transaction: Common Stock — 160,305 shares (Direct)

Footnotes (1)

1. F1. Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the second quarter of 2026.

Key Figures

Stock grant size: 5,472 shares Grant price: $4.34 per share Post-transaction holdings: 160,305 shares +2 more

5 metrics

Stock grant size 5,472 shares Common Stock grant in lieu of Q2 2026 board cash fees

Grant price $4.34 per share Reported value per share for the stock award

Post-transaction holdings 160,305 shares Total Quanterix common shares held directly after the grant

Transaction date July 1, 2026 Date of the Common Stock grant reported on Form 4

Transaction code A (Grant, award, or other acquisition) Indicates compensation-related acquisition, not market trade

Key Terms

Common Stock, Grant, award, or other acquisition, in lieu of cash fees, Board of Directors

4 terms

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

in lieu of cash fees financial

"stock granted in lieu of cash fees for service on the Company's Board"

Board of Directors financial

"service on the Company's Board of Directors and committees thereof"

The Board of Directors is a group of people chosen by a company's owners to help make big decisions and oversee how the company is run. They act like a team of advisors or managers, making sure the company stays on track and meets its goals. Their choices can influence the company's success and how it grows.

FAQ

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

What did Quanterix Corp (QTRX) director William P. Donnelly report in this Form 4?

He reported receiving 5,472 shares of Common Stock as a stock grant. The grant represents compensation for serving on Quanterix’s Board of Directors and its committees during the second quarter of 2026, rather than a market purchase or sale.

Was the Quanterix (QTRX) Form 4 transaction a stock purchase or sale?

The transaction was a grant or award, not a market purchase or sale. The Form 4 uses code "A" for a grant, with 5,472 shares issued as compensation in lieu of cash fees for board service in the second quarter of 2026.

How many Quanterix (QTRX) shares does William P. Donnelly hold after this Form 4 transaction?

After the reported grant, Donnelly directly holds 160,305 Quanterix common shares. This total reflects his updated ownership following the 5,472-share stock award granted as compensation for his second quarter 2026 board and committee service.

What price per share is associated with the Quanterix (QTRX) stock grant to William P. Donnelly?

The stock grant is reported at $4.34 per share. This value is used in the Form 4 for the 5,472-share compensation award, which replaced cash fees for Donnelly’s service on Quanterix’s Board and its committees in the second quarter of 2026.

Why did Quanterix (QTRX) grant stock instead of paying cash fees to director William P. Donnelly?

The footnote states the shares were granted in lieu of cash fees. Specifically, the 5,472 shares represent compensation for his service on Quanterix’s Board of Directors and its committees for the second quarter of 2026, aligning director pay partly with company equity.

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

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Accepted by SEC EDGAR 07/02/2026 - 04:02 PM EDT 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^*

DONNELLY WILLIAM P

(Last) (First) (Middle)

C/O QUANTERIX CORPORATION

900 MIDDLESEX TURNPIKE

(Street)

BILLERICA MASSACHUSETTS 01821

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Quanterix Corp [ QTRX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

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	07/01/2026		A		5,472(1)	A	$4.34	160,305	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. Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the second quarter of 2026.

Remarks:

	/s/ Meghan Shevlin, Attorney-in-Fact	07/02/2026
	** 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)