Director stock grant at Quanterix (QTRX) disclosed in Form 4 filing

Rhea-AI Filing Summary

Quanterix Corp director Paul M. Meister reported a stock-based board fee grant. On 01/02/2026, he acquired 3,974 shares of Quanterix common stock at a stated price of $0.00 per share as stock granted in lieu of cash fees for service on the company's Board of Directors and its committees for the third and fourth quarter of 2025. After this grant, he beneficially owned 313,253 shares of Quanterix common stock held directly.

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

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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^*

MEISTER PAUL M

(Last) (First) (Middle)

C/O QUANTERIX CORPORATION,

900 MIDDLESEX TURNPIKE

(Street)

BILLERICA MA 01821

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
01/02/2026

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

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

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

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	01/02/2026		A		3,974(1)	A	$0.00	313,253	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 third and fourth quarter of 2025.

Remarks:

	/s/ Bonnie McManus, Attorney-in-Fact	01/07/2026
	** 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.

FAQ

What insider transaction did Quanterix (QTRX) report for Paul M. Meister?

Quanterix reported that director Paul M. Meister acquired 3,974 shares of common stock on 01/02/2026 as a stock grant.

What was the price per share for Paul M. Meister’s Quanterix stock grant?

The 3,974 shares of Quanterix common stock granted to Paul M. Meister were reported at a price of $0.00 per share as they were issued in lieu of cash fees.

Why did Paul M. Meister receive Quanterix shares instead of cash?

The filing states the shares consist of stock granted in lieu of cash fees for service on Quanterix's Board of Directors and its committees for the third and fourth quarter of 2025.

How many Quanterix shares does Paul M. Meister own after this transaction?

Following the reported grant, Paul M. Meister beneficially owned 313,253 shares of Quanterix common stock, held directly.

What is Paul M. Meister’s relationship to Quanterix?

Paul M. Meister is listed in the filing as a Director of Quanterix Corp and is not marked as an officer or 10% owner.

Was this Quanterix insider transaction reported on a Form 4 or Form 5?

This insider transaction by Paul M. Meister was reported on a Form 4, covering changes in beneficial ownership of Quanterix equity securities.