# EDGAR Filing Document

**Accession Number:** 0001503274
**File Stem:** 0002098803-25-000005
**Filing Date:** 2025-12
**Character Count:** 8890
**Document Hash:** dad55884f5f6c527f5a4f727497500dc
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002098803-25-000005.hdr.sgml**: 20251208

**ACCESSION NUMBER**: 0002098803-25-000005

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20251120

**FILED AS OF DATE**: 20251208

**DATE AS OF CHANGE**: 20251208

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Sachs Alan Bruce
- **CENTRAL INDEX KEY:** 0002098803

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38319
- **FILM NUMBER:** 251554844

**MAIL ADDRESS:**
- **STREET 1:** 900 MIDDLESEX TURNPIKE
- **CITY:** BILLERICA
- **STATE:** MA
- **ZIP:** 01821
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Quanterix Corp
- **CENTRAL INDEX KEY:** 0001503274
- **STANDARD INDUSTRIAL CLASSIFICATION:** LABORATORY ANALYTICAL INSTRUMENTS [3826]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 208957988
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 900 MIDDLESEX TURNPIKE
- **CITY:** BILLERICA
- **STATE:** MA
- **ZIP:** 01821
- **BUSINESS PHONE:** 617-301-9400

**MAIL ADDRESS:**
- **STREET 1:** 900 MIDDLESEX TURNPIKE
- **CITY:** BILLERICA
- **STATE:** MA
- **ZIP:** 01821

## Ex-24

```

LIMITED POWER OF ATTORNEY

The undersigned hereby constitutes and appoints Bonnie McManus of
Quanterix Corporation (the "Company") and David Engvall and William
Mastrianna of Covington & Burling LLP, and each of them, the
undersigned's true and lawful attorney-in-fact to:

execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of the Company, Forms 3, 4s and
5s in accordance with Section 16(a) of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and the rules and regulations
thereunder;

execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of the Company, Forms 3, 4s and
5s in accordance with Section 16(a) of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and the rules and regulations
thereunder;

do and perform any and all acts for and on behalf of the undersigned
that may be necessary or desirable to complete and execute any such
Forms 3, 4s and 5s and timely file such forms with the Securities and
Exchange Commission and any stock exchange or similar authority, if
required; and

do and perform any and all acts for and on behalf of the undersigned
that may be necessary or desirable to complete and execute any such
Forms 3, 4s and 5s and timely file such forms with the Securities and
Exchange Commission and any stock exchange or similar authority, if
required; and

take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of such attorney-in-fact, may be of
benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Limited
Power of Attorney shall be in such form and shall contain such terms
and conditions as such attorney-in-fact may approve in such attorney-
in-fact's discretion.

take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of such attorney-in-fact, may be of
benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Limited
Power of Attorney shall be in such form and shall contain such terms
and conditions as such attorney-in-fact may approve in such attorney-
in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform each and every act and thing
whatsoever requisite, necessary or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all
intents and purposes as the undersigned might or could do if
personally present, with full power of substitution and revocation,
hereby ratifying and confirming all that each such attorney-in-fact,
or each such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney
and the rights and powers herein granted.  The undersigned
acknowledges that each of the foregoing attorneys-in-fact, in serving
in such capacity at the request of the undersigned, is not assuming,
nor is the Company assuming, any of the undersigned's responsibilities
to comply with Section 16 of the Exchange Act.

The undersigned agrees that each such attorney-in-fact may rely
entirely on information furnished orally or in writing by the
undersigned to each such attorney-in-fact. The undersigned also agrees
to indemnify and hold harmless the Company and each such attorney-in-
fact against any losses, claims, damages or liabilities (or actions in
these respects) that arise out of or are based on any untrue statement
or omission of necessary facts in the information provided by the
undersigned to such attorney-in-fact for purposes of executing,
acknowledging, delivering and filing Forms 3, 4s or 5s (including
amendments thereto) and agrees to reimburse the Company and each such
attorney-in-fact for any legal or other expenses reasonably incurred
in connection with investigating or defending against any such loss,
claim, damage, liability or action.

This Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4s and 5s
with respect to the undersigned's holdings of and transactions in
securities issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing attorneys-
in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Limited Power of
Attorney to be executed as of November 18, 2025.

/s/ Alan Sachs Name: Alan Sachs

```

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Sachs Alan Bruce<br><sub>(Last) (First) (Middle)</sub><br>C/O QUANTERIX CORPORATION<br>900 MIDDLESEX TURNPIKE<br><sub>(Street)</sub><br>BILLERICA, MA 01821<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Quanterix Corp [ QTRX ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-11-20 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| No securities beneficially held | 0.00 | D |  |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |

---

**Signature:** /s/ Bonnie McManus, Attorney-in-Fact  
**Date:** 2025-12-04

### Remarks:

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.**