Quanterix director converts awards into 4,224 shares

The 12,800-unit award vests 33%, 33%, and 34% on the first, second, and third anniversaries of its October 2, 2024 grant date.

Rhea-AI Filing Summary

Quanterix Corp director Ivana Magovcevic-Liebisch converted 4,224 restricted stock units into 4,224 common shares on October 2, 2026, on a one-for-one basis. After the conversion, she directly held 4,352 restricted stock units and 15,883 common shares. The units were part of a 12,800-unit grant dated October 2, 2024.

Insider Trade Summary

4,224 shares exercised/converted

Exercise 2 txns

Insider Magovcevic-Liebisch Ivana

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit F2	4,224	$0.00	$0.00
Exercise	Common Stock F1	4,224	--	--

Holdings After Transaction: Restricted Stock Unit — 4,352 contracts (Direct); Common Stock — 15,883 shares (Direct)

Footnotes (2)

1. F1. Restricted stock units convert into common stock on a one-for-one basis.
2. F2. On October 2, 2024, the reporting person was granted 12,800 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

Key Figures

Restricted stock units converted: 4,224 restricted stock units Common shares acquired: 4,224 common shares Restricted stock units following conversion: 4,352 restricted stock units +2 more

5 metrics

Restricted stock units converted 4,224 restricted stock units October 2, 2026

Common shares acquired 4,224 common shares October 2, 2026

Restricted stock units following conversion 4,352 restricted stock units Direct holdings after the October 2, 2026 transaction

Common shares following conversion 15,883 common shares Direct holdings after the October 2, 2026 transaction

Restricted stock units granted 12,800 restricted stock units Granted October 2, 2024

Key Terms

Restricted stock units, one-for-one basis, vesting

3 terms

Restricted stock units financial

"Restricted stock units convert into common stock on a one-for-one basis."

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.

one-for-one basis financial

"convert into common stock on a one-for-one basis."

vesting financial

"vesting 33%, 33%, and 34% on the first, second, and third anniversaries"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What did the QTRX director report on October 2, 2026?

Ivana Magovcevic-Liebisch converted 4,224 restricted stock units into 4,224 common shares on a one-for-one basis. After the conversion, she directly held 4,352 restricted stock units and 15,883 common shares.

What is the vesting schedule for Ivana Magovcevic-Liebisch’s QTRX RSUs?

The 12,800 restricted stock units were granted on October 2, 2024, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

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

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Available on EDGAR 10/02/2026 - 04:06 PM Accepted by SEC EDGAR 10/02/2026 - 04:05 PM 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^*

Magovcevic-Liebisch Ivana

(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)
10/02/2026

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	10/02/2026		M		4,224	A	(1)	15,883	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
Restricted Stock Unit	$0.00	10/02/2026		M			4,224	(2)	(2)	Common Stock	4,224	$0.00	4,352	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-for-one basis.

2. On October 2, 2024, the reporting person was granted 12,800 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

Remarks:

	/s/ Meghan Shevlin, Attorney-in-Fact	10/02/2026
	** 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)