Quanterix (NASDAQ: QTRX) director gets 23,372 RSUs at $0 grant award

Rhea-AI Filing Summary

Quanterix Corporation director Ivana Magovcevic-Liebisch received an equity grant of 23,372 restricted stock units (RSUs) of common stock on January 2, 2026. The RSUs were granted at a price of $0.00 per unit under the company’s Amended and Restated Non-Employee Director Compensation Policy.

The RSUs vest as to 100% of the shares on January 2, 2027, meaning they convert into common shares on that date if vesting conditions are met. Following this grant, she beneficially owns 43,607 RSUs, each representing the right to receive one share of Quanterix common stock.

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^*

Magovcevic-Liebisch Ivana

(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	43,607(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 43,607 restricted stock units.

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

What insider transaction did Quanterix (QTRX) report in this Form 4?

The filing reports that director Ivana Magovcevic-Liebisch received an award of 23,372 restricted stock units (RSUs) of Quanterix common stock on January 2, 2026 at a price of $0.00 per unit.

How do the new RSUs granted to the Quanterix (QTRX) director vest?

The Form 4 states that the 23,372 RSUs granted to the director vest as to 100% of the shares on January 2, 2027, at which point each RSU represents the right to receive one share of common stock.

How many Quanterix (QTRX) shares or units does the director own after this transaction?

After the reported grant, the director beneficially owns 43,607 restricted stock units, according to the Form 4, all reported as held with direct ownership.

What is the role of the reporting person in Quanterix (QTRX)?

The reporting person, Ivana Magovcevic-Liebisch, is identified in the Form 4 as a director of Quanterix Corporation and is not marked as an officer or 10% owner.

Was this Quanterix (QTRX) Form 4 transaction a purchase or sale on the open market?

No open-market purchase or sale is reported. The Form 4 shows an "A" transaction code, indicating an acquisition of 23,372 RSUs at $0.00, granted under the company’s non-employee director compensation policy.

Does this Quanterix (QTRX) Form 4 involve any indirect ownership through entities or family members?

The reported holdings are shown as direct (D) ownership, and the footnotes describe the awards as restricted stock units granted under the director compensation policy, without referencing any separate holding entities.