# EDGAR Filing Document

**Accession Number:** 0002037231
**File Stem:** 0001539497-25-001870
**Filing Date:** 2025-7
**Character Count:** 19249
**Document Hash:** fc928a03202ef2dd33f1bcc2423797e3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001539497-25-001870.hdr.sgml**: 20250715

**ACCESSION NUMBER**: 0001539497-25-001870

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250715

**DATE AS OF CHANGE**: 20250715

**SUBJECT COMPANY**: 

**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

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-90285
- **FILM NUMBER:** 251125622

**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
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Kent Lake PR LLC
- **CENTRAL INDEX KEY:** 0002037231

**ORGANIZATION NAME:**
- **EIN:** 661073290
- **STATE OF INCORPORATION:** PR
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** CARR. 115 KM 12.1 AVENUE
- **STREET 2:** AVE. ALBIZU CAMPOS #2490, SUITE 28
- **CITY:** RINCON
- **PROVINCE COUNTRY:** PR
- **ZIP:** 00677
- **BUSINESS PHONE:** (415) 799-2720

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 116 CALLE MANUEL DOMENECH
- **STREET 2:** #2035
- **CITY:** SAN JUAN
- **PROVINCE COUNTRY:** PR
- **ZIP:** 00918

## Ex-1

**Exhibit 1**

**<u>Transactions in Shares Effected by Kent Lake Partners LP During the Past Sixty Days</u>**

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;<u>Nature of Transaction</u> | &nbsp;&nbsp;Amount of Securities<br> <u>Purchased/(Sold)</u> | &nbsp;&nbsp;<u>Price ($)</u> | &nbsp;&nbsp;Date of<br> <u>Purchase/Sale</u> |
| &nbsp;&nbsp;Sale of Common Stock | &nbsp;&nbsp;(117472) | &nbsp;&nbsp;$6.4860 | &nbsp;&nbsp;06/18/2025 |
| &nbsp;&nbsp;Sale of Common Stock | &nbsp;&nbsp;(90845) | &nbsp;&nbsp;$6.1877 | &nbsp;&nbsp;06/20/2025 |
| &nbsp;&nbsp;Sale of Common Stock | &nbsp;&nbsp;(83398) | &nbsp;&nbsp;$6.1497 | &nbsp;&nbsp;06/23/2025 |
| &nbsp;&nbsp;Sale of Common Stock | &nbsp;&nbsp;(69463) | &nbsp;&nbsp;$6.1484 | &nbsp;&nbsp;06/24/2025 |
| &nbsp;&nbsp;Sale of Common Stock | &nbsp;&nbsp;(26294) | &nbsp;&nbsp;$6.1095 | &nbsp;&nbsp;06/25/2025 |
| &nbsp;&nbsp;Sale of Common Stock | &nbsp;&nbsp;(211500)<sup>1</sup> | &nbsp;&nbsp;-- | &nbsp;&nbsp;07/14/2025 |

---

------

<sup>1</sup> Represents a short sale of Akoya Biosciences, Inc. shares delivered pursuant to the closing of the merger with the Issuer.

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 2)**

**Quanterix Corp**

*(Name of Issuer)*

**Common Stock, $0.001 par value per share**

*(Title of Class of Securities)*

**74766Q101**

*(CUSIP Number)*

**BENJAMIN NATTER**<br>KENT LAKE PR LLC, Carr. 115 km 12.1 Ave.<br>Albizu Campos #2490 Suite 28<br>Rincon PR 00677<br>415-237-0007

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**07/11/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **74766Q101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Kent Lake Partners LP** | Name of reporting person<br>**Kent Lake Partners LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**2089500.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**2089500.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**2089500.00** | Aggregate amount beneficially owned by each reporting person<br>**2089500.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.5%** | Percent of class represented by amount in Row (11)<br>**4.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **74766Q101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Kent Lake PR LLC** | Name of reporting person<br>**Kent Lake PR LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**PR** | Citizenship or place of organization<br>**PR** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**2089500.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**2089500.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**2089500.00** | Aggregate amount beneficially owned by each reporting person<br>**2089500.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.5%** | Percent of class represented by amount in Row (11)<br>**4.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

| **CUSIP No.** | **74766Q101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Benjamin Natter** | Name of reporting person<br>**Benjamin Natter** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**2089500.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**2089500.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**2089500.00** | Aggregate amount beneficially owned by each reporting person<br>**2089500.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.5%** | Percent of class represented by amount in Row (11)<br>**4.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **74766Q101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Alexander G. Dickinson** | Name of reporting person<br>**Alexander G. Dickinson** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**0.00** | Aggregate amount beneficially owned by each reporting person<br>**0.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0%** | Percent of class represented by amount in Row (11)<br>**0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **74766Q101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Bruce Felt** | Name of reporting person<br>**Bruce Felt** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**0.00** | Aggregate amount beneficially owned by each reporting person<br>**0.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0%** | Percent of class represented by amount in Row (11)<br>**0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **74766Q101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Hakan Sakul** | Name of reporting person<br>**Hakan Sakul** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**0.00** | Aggregate amount beneficially owned by each reporting person<br>**0.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0%** | Percent of class represented by amount in Row (11)<br>**0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, $0.001 par value per share

**(b) Name of Issuer:**
Quanterix Corp

**(c) Address of Issuer's Principal Executive Offices:**
900 MIDDLESEX TURNPIKE, BILLERICA, MA, 01821

Comment: The following constitutes Amendment No. 2 to the Schedule 13D filed by the undersigned ("Amendment No. 2"). This Amendment No. 2 amends the Schedule 13D as specifically set forth herein. Unless otherwise defined herein, all capitalized terms used herein shall have the meanings given to them in the Schedule 13D.

**Item 4. Purpose of Transaction**

Item 4 is hereby amended to add the following:

As previously disclosed in Amendment No. 1 to the Schedule 13D, on February 28, 2025, Kent Lake delivered a letter to the Issuer nominating Alexander G. Dickinson, Bruce Felt and Hakan Sakul (the "Nominees") for election to the Board of Directors of the Issuer (the "Board") at the 2025 annual meeting of stockholders (the "Annual Meeting"). On July 11, 2025, Kent Lake resubmitted its nomination of the Nominees for election to the Board at the Annual Meeting following the Issuer's disclosure that the Annual Meeting will now be held on September 23, 2025.

**Item 5. Interest in Securities of the Issuer**

**(a)**
Items 5(a)-(c) are hereby amended and restated to read as follows:

As of the date hereof, the Reporting Persons beneficially own 2,089,500 shares in the aggregate, representing approximately 4.5% of the outstanding Shares. The aggregate percentage of Shares reported owned by the Reporting Persons herein is based upon approximately 46,654,879 outstanding, which is the total number of shares outstanding as reported in the Issuer's Post-Effective Amendment No. 3 on Form S-8 filed with the Securities and Exchange Commission on July 11, 2025.

**(b)**
The Reporting Persons have sole voting power and sole investment power with respect to the Shares beneficially owned by the Reporting Persons.

**(c)**
During the past sixty days, none of the Reporting Persons has effected any transaction in the Shares, except as set forth in Exhibit 1, which is incorporated herein by reference.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Kent Lake Partners LP

**Signature:** /s/ Benjamin Natter

**Name/Title:** Managing Member

**Date:** 07/15/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Kent Lake PR LLC

**Signature:** /s/ Benjamin Natter

**Name/Title:** Managing Member

**Date:** 07/15/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Benjamin Natter

**Signature:** /s/ Benjamin Natter

**Name/Title:** Indvidually and as attorney-in-fact for Alexander G. Dickinson, Bruce Felt and Hakan Sakul

**Date:** 07/15/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Alexander G. Dickinson

**Signature:** /s/ Benjamin Natter

**Name/Title:** Indvidually and as attorney-in-fact for Alexander G. Dickinson, Bruce Felt and Hakan Sakul

**Date:** 07/15/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Bruce Felt

**Signature:** /s/ Benjamin Natter

**Name/Title:** Indvidually and as attorney-in-fact for Alexander G. Dickinson, Bruce Felt and Hakan Sakul

**Date:** 07/15/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Hakan Sakul

**Signature:** /s/ Benjamin Natter

**Name/Title:** Indvidually and as attorney-in-fact for Alexander G. Dickinson, Bruce Felt and Hakan Sakul

**Date:** 07/15/2025