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[Form 4] Quanterix Corporation Insider Trading Activity

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
4
Rhea-AI Filing Summary

Toloue Masoud, President & CEO and director of Quanterix Corporation (QTRX), reported a transaction dated 08/15/2025 showing a disposition of 1,242 shares of common stock at a price of $4.57 per share under transaction code F. The filing explains those shares were withheld by the company to cover tax obligations related to the vesting of 3,722 restricted stock units (RSUs). After the reported transaction, the reporting person beneficially owns 514,688 shares, which the filing notes includes 228,813 restricted stock units. The form was signed by an attorney-in-fact on 08/19/2025.

Toloue Masoud, Presidente e CEO nonché amministratore di Quanterix Corporation (QTRX), ha segnalato una transazione datata 15/08/2025 che mostra la cessione di 1.242 azioni ordinarie a un prezzo di $4,57 per azione, classificata con il codice transazione F. Il documento precisa che quelle azioni sono state trattenute dalla società per coprire le imposte dovute in relazione alla maturazione di 3.722 restricted stock units (RSU). Dopo la transazione segnalata, la persona che effettua la segnalazione detiene in via beneficiaria 514.688 azioni, delle quali 228.813 sono RSU. Il modulo è stato firmato da un procuratore il 19/08/2025.

Toloue Masoud, presidente y director ejecutivo y miembro del consejo de Quanterix Corporation (QTRX), informó una operación con fecha 15/08/2025 que refleja la disposición de 1.242 acciones ordinarias a un precio de $4,57 por acción bajo el código de transacción F. la presentación explica que dichas acciones fueron retenidas por la compañía para cubrir obligaciones fiscales relacionadas con la consolidación de 3.722 unidades de acciones restringidas (RSU). Tras la operación reportada, la persona informante posee beneficiariamente 514.688 acciones, que incluyen 228.813 RSU. El formulario fue firmado por un apoderado el 19/08/2025.

톨루� 마수�� Quanterix Corporation(QTRX)� 회장 � 최고경영�(CEO) � 이사로서 2025-08-15� 거래� 보고했으�, 해당 거래� 거래 코드 F� 보통� 1,242주를 주당 $4.57� 처분� 것으� 나타났습니다. 제출서류� 해당 주식들이 3,722개의 제한주식단위(RSU) 권리확정� 따른 세금 부담을 충당하기 위해 회사� 의해 원천징수되었다고 설명합니�. 보고� 거래 이후 보고인은 � 514,688주를 실질 보유하고 있으�, � � 228,813주는 RSU� 해당한다� 기재되어 있습니다. 서식은 2025-08-19� 법정대리인� 서명했습니다.

Toloue Masoud, président et directeur général ainsi que membre du conseil d'administration de Quanterix Corporation (QTRX), a déclaré une opération datée du 15/08/2025 indiquant la cession de 1 242 actions ordinaires au prix de 4,57 $ par action, sous le code de transaction F. le dépôt précise que ces actions ont été retenues par la société pour couvrir les obligations fiscales liées à la consolidation de 3 722 unités d'actions restreintes (RSU). Après l'opération déclarée, la personne déclarante détient à titre bénéficiaire 514 688 actions, dont 228 813 RSU. Le formulaire a été signé par un mandataire le 19/08/2025.

Toloue Masoud, Präsident & CEO und Director von Quanterix Corporation (QTRX), meldete eine Transaktion vom 15.08.2025, die die Veräußerung von 1.242 Stammaktien zu einem Preis von $4,57 pro Aktie unter dem Transaktionscode F ausweist. Die Einreichung erklärt, dass diese Aktien vom Unternehmen einbehalten wurden, um Steuerverpflichtungen im Zusammenhang mit der Vesting von 3.722 Restricted Stock Units (RSUs) zu begleichen. Nach der gemeldeten Transaktion besitzt die meldende Person wirtschaftlich 514.688 Aktien, wovon 228.813 Restricted Stock Units sind. Das Formular wurde am 19.08.2025 von einem Bevollmächtigten unterschrieben.

Positive
  • None.
Negative
  • None.

Insights

TL;DR: Routine insider tax-withholding on RSU vesting; no change to strategic ownership.

The Form 4 documents a small disposition of 1,242 shares at $4.57 to satisfy tax withholding tied to the vesting of 3,722 RSUs. This is a common administrative step that converts part of equity compensation into cash to meet tax obligations and does not indicate a cash-sale decision beyond withholding. The remaining beneficial ownership of 514,688 shares, including 228,813 RSUs, suggests continued substantial insider alignment with shareholder value. There are no other purchases, exercises, or derivative transactions disclosed.

TL;DR: Disclosure is standard and compliant; withholding reduces outstanding vested shares but preserves long-term alignment.

The filing clearly identifies the reporting person, relationship to the issuer, and the nature of the disposition as tax-related withholding from vested RSUs. Use of an attorney-in-fact signature is noted and dated. From a governance perspective, the transaction is routine, transparently documented, and does not reflect a change in executive control or a material shift in ownership structure based on the presented figures.

Toloue Masoud, Presidente e CEO nonché amministratore di Quanterix Corporation (QTRX), ha segnalato una transazione datata 15/08/2025 che mostra la cessione di 1.242 azioni ordinarie a un prezzo di $4,57 per azione, classificata con il codice transazione F. Il documento precisa che quelle azioni sono state trattenute dalla società per coprire le imposte dovute in relazione alla maturazione di 3.722 restricted stock units (RSU). Dopo la transazione segnalata, la persona che effettua la segnalazione detiene in via beneficiaria 514.688 azioni, delle quali 228.813 sono RSU. Il modulo è stato firmato da un procuratore il 19/08/2025.

Toloue Masoud, presidente y director ejecutivo y miembro del consejo de Quanterix Corporation (QTRX), informó una operación con fecha 15/08/2025 que refleja la disposición de 1.242 acciones ordinarias a un precio de $4,57 por acción bajo el código de transacción F. la presentación explica que dichas acciones fueron retenidas por la compañía para cubrir obligaciones fiscales relacionadas con la consolidación de 3.722 unidades de acciones restringidas (RSU). Tras la operación reportada, la persona informante posee beneficiariamente 514.688 acciones, que incluyen 228.813 RSU. El formulario fue firmado por un apoderado el 19/08/2025.

톨루� 마수�� Quanterix Corporation(QTRX)� 회장 � 최고경영�(CEO) � 이사로서 2025-08-15� 거래� 보고했으�, 해당 거래� 거래 코드 F� 보통� 1,242주를 주당 $4.57� 처분� 것으� 나타났습니다. 제출서류� 해당 주식들이 3,722개의 제한주식단위(RSU) 권리확정� 따른 세금 부담을 충당하기 위해 회사� 의해 원천징수되었다고 설명합니�. 보고� 거래 이후 보고인은 � 514,688주를 실질 보유하고 있으�, � � 228,813주는 RSU� 해당한다� 기재되어 있습니다. 서식은 2025-08-19� 법정대리인� 서명했습니다.

Toloue Masoud, président et directeur général ainsi que membre du conseil d'administration de Quanterix Corporation (QTRX), a déclaré une opération datée du 15/08/2025 indiquant la cession de 1 242 actions ordinaires au prix de 4,57 $ par action, sous le code de transaction F. le dépôt précise que ces actions ont été retenues par la société pour couvrir les obligations fiscales liées à la consolidation de 3 722 unités d'actions restreintes (RSU). Après l'opération déclarée, la personne déclarante détient à titre bénéficiaire 514 688 actions, dont 228 813 RSU. Le formulaire a été signé par un mandataire le 19/08/2025.

Toloue Masoud, Präsident & CEO und Director von Quanterix Corporation (QTRX), meldete eine Transaktion vom 15.08.2025, die die Veräußerung von 1.242 Stammaktien zu einem Preis von $4,57 pro Aktie unter dem Transaktionscode F ausweist. Die Einreichung erklärt, dass diese Aktien vom Unternehmen einbehalten wurden, um Steuerverpflichtungen im Zusammenhang mit der Vesting von 3.722 Restricted Stock Units (RSUs) zu begleichen. Nach der gemeldeten Transaktion besitzt die meldende Person wirtschaftlich 514.688 Aktien, wovon 228.813 Restricted Stock Units sind. Das Formular wurde am 19.08.2025 von einem Bevollmächtigten unterschrieben.

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*
Toloue Masoud

(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
X Officer (give title below) Other (specify below)
President & CEO
3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025
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 08/15/2025 F 1,242(1) D $4.57 514,688(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. Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 3,722 RSUs.
2. Includes 228,813 restricted stock units.
Remarks:
/s/ Brian Keane, as Attorney-in-Fact 08/19/2025
** 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 transaction did Toloue Masoud report on Form 4 for QTRX?

The report shows a disposition of 1,242 shares of common stock on 08/15/2025 at $4.57 per share under transaction code F.

Why were shares disposed in this Form 4 filing for QTRX?

The filing states 1,242 shares were withheld by Quanterix solely to cover tax obligations upon the vesting of 3,722 RSUs.

How many shares does the reporting person beneficially own after the transaction?

Following the reported transaction, the reporting person beneficially owns 514,688 shares, which includes 228,813 restricted stock units.

What is Toloue Masoud's role at Quanterix as listed on the form?

The form lists Toloue Masoud as a Director and as an Officer with the title President & CEO.

When was the Form 4 signed and by whom?

The signature block shows the form was signed by Brian Keane, as Attorney-in-Fact on 08/19/2025.
Quanterix

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Medical Devices
Laboratory Analytical Instruments
United States
BILLERICA