Quanterix (QTRX) director granted RSUs and stock in lieu of fees shares

Rhea-AI Filing Summary

Quanterix Corp director Myla Lai-Goldman reported new equity awards in the company’s common stock. On January 2, 2026, she received 23,372 restricted stock units that will vest in full on January 2, 2027 under Quanterix’s Amended and Restated Non-Employee Director Compensation Policy, with each unit representing one share of common stock. The same day, she was also granted 1,944 shares of common stock issued in lieu of cash fees for serving on the board and its committees for the fourth quarter of 2025. Both awards were recorded at a price of $0.00 per share. After these transactions, she directly beneficially owned 54,804 shares of Quanterix common stock, which the filing notes include 47,836 restricted stock units.

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

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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^*

LAI GOLDMAN MYLA

(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		23,372(1)	A	$0.00	52,860(2)	D
Common Stock	01/02/2026		A		1,944(3)	A	$0.00	54,804(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. Represents restricted stock units that vest as to 100% of the shares on January 2, 2027 granted pursuant to the Quanterix Corporation Amended and Restated Non-Employee Director Compensation Policy. Each restricted stock unit represents the right to receive one share of the Issuer's common stock.

2. Includes 47,836 restricted stock units.

3. Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2025.

Remarks:

	/s/ Bonnie McManus, Attorney-in-Fact	01/06/2026
	** 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

Who is the reporting person in this Quanterix (QTRX) Form 4 filing?

The reporting person is Myla Lai-Goldman, who is identified as a director of Quanterix Corp and is not listed as an officer or 10% owner.

What equity awards did Myla Lai-Goldman receive from Quanterix (QTRX) on January 2, 2026?

On January 2, 2026, she received 23,372 restricted stock units that vest 100% on January 2, 2027 and a separate grant of 1,944 shares of common stock.

How do the restricted stock units granted to the Quanterix director vest?

The filing states that the 23,372 restricted stock units vest as to 100% of the shares on January 2, 2027, and each unit represents the right to receive one share of Quanterix common stock.

Why did Quanterix grant 1,944 shares of common stock to the director?

According to the explanation of responses, the 1,944 shares consist of stock granted in lieu of cash fees for Myla Lai-Goldman’s service on the board of directors and its committees for the fourth quarter of 2025.

What was the reported price per share for the Quanterix equity awards?

Both the restricted stock units and the shares granted in lieu of cash fees were reported with a price of $0.00 per share, reflecting that these were compensation grants rather than open-market purchases.

How many Quanterix (QTRX) shares did the director own after these transactions?

After the reported grants, Myla Lai-Goldman beneficially owned 54,804 shares of Quanterix common stock directly, and this amount includes 47,836 restricted stock units.