# EDGAR Filing Document

**Accession Number:** 0001736730
**File Stem:** 0001193125-25-201392
**Filing Date:** 2025-9
**Character Count:** 18369
**Document Hash:** 3febbe5d39f7fd6d2f3fc5707208d9ef
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-201392.hdr.sgml**: 20250911

**ACCESSION NUMBER**: 0001193125-25-201392

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250911

**FILED AS OF DATE**: 20250911

**DATE AS OF CHANGE**: 20250911

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Chee Brian
- **CENTRAL INDEX KEY:** 0001295675

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42365
- **FILM NUMBER:** 251309154

**MAIL ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE, 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** SCHULMAN AMY W
- **CENTRAL INDEX KEY:** 0001438226

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42365
- **FILM NUMBER:** 251309155

**MAIL ADDRESS:**
- **STREET 1:** PFIZER INC. ATTN: CORPORATE SECRETARY
- **STREET 2:** 235 EAST 42ND STREET
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10017
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Polaris Partners VII, L.P.
- **CENTRAL INDEX KEY:** 0001611189

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42365
- **FILM NUMBER:** 251309159

**BUSINESS ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE
- **STREET 2:** 10TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 855-787-3500

**MAIL ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE
- **STREET 2:** 10TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Polaris Partners X, L.P.
- **CENTRAL INDEX KEY:** 0001910577

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42365
- **FILM NUMBER:** 251309157

**BUSINESS ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE
- **STREET 2:** 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 855-787-3500

**MAIL ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE
- **STREET 2:** 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Polaris Management Co. VII, L.L.C.
- **CENTRAL INDEX KEY:** 0001678203

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42365
- **FILM NUMBER:** 251309160

**BUSINESS ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE, 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 855-787-3500

**MAIL ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE, 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Polaris Entrepreneurs' Fund VII, L.P.
- **CENTRAL INDEX KEY:** 0001615991

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42365
- **FILM NUMBER:** 251309158

**BUSINESS ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE, 10TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 855-787-3500

**MAIL ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE, 10TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Polaris Partners GP X, L.L.C.
- **CENTRAL INDEX KEY:** 0001910575

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42365
- **FILM NUMBER:** 251309156

**BUSINESS ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE
- **STREET 2:** 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 855-787-3500

**MAIL ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE
- **STREET 2:** 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Camp4 Therapeutics Corp
- **CENTRAL INDEX KEY:** 0001736730
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** ONE KENDALL SQUARE
- **STREET 2:** BUILDING 1400 WEST, 3RD FLOOR
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02139
- **BUSINESS PHONE:** 617-651-8867

**MAIL ADDRESS:**
- **STREET 1:** ONE KENDALL SQUARE
- **STREET 2:** BUILDING 1400 WEST, 3RD FLOOR
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02139

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[x] 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**<sup>*</sup><br>Polaris Management Co. VII, L.L.C.<br><sub>(Last) (First) (Middle)</sub><br>ONE MARINA PARK DRIVE, 8TH FLOOR<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-09-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Camp4 Therapeutics Corp [ CAMP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Polaris Partners VII, L.P.<br><sub>(Last) (First) (Middle)</sub><br>ONE MARINA PARK DRIVE, 8TH FLOOR<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-09-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Camp4 Therapeutics Corp [ CAMP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Polaris Entrepreneurs' Fund VII, L.P.<br><sub>(Last) (First) (Middle)</sub><br>ONE MARINA PARK DRIVE 8TH FLOOR<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-09-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Camp4 Therapeutics Corp [ CAMP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Polaris Partners X, L.P.<br><sub>(Last) (First) (Middle)</sub><br>ONE MARINA PARK DRIVE, 8TH FLOOR<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-09-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Camp4 Therapeutics Corp [ CAMP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Polaris Partners GP X, L.L.C.<br><sub>(Last) (First) (Middle)</sub><br>ONE MARINA PARK DRIVE, 8TH FLOOR<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-09-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Camp4 Therapeutics Corp [ CAMP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>SCHULMAN AMY W<br><sub>(Last) (First) (Middle)</sub><br>ONE MARINA PARK DRIVE, 8TH FLOOR<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-09-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Camp4 Therapeutics Corp [ CAMP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Chee Brian<br><sub>(Last) (First) (Middle)</sub><br>ONE MARINA PARK DRIVE, 8TH FLOOR<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-09-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Camp4 Therapeutics Corp [ CAMP ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-09-11 |  | P<sup>(1)</sup> |  | 1221721 | A | $1.53 | 2825500 | I | See footnote<sup>(2)</sup> |
| Common Stock | 2025-09-11 |  | P<sup>(1)</sup> |  | 85468 | A | $1.53 | 197661 | I | See footnote<sup>(3)</sup> |
| Common Stock |  |  |  |  |  |  |  | 909090 | I | See footnote<sup>(4)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) On September 11, 2025, each of Polaris Partners VII, L.P. ("PP VII") and Polaris Entrepreneurs' Fund VII, L.P. ("PEF VII") acquired shares in a private placement by the Issuer pursuant to the terms of a Securities Purchase Agreement, dated as of September 9, 2025, by and among the Issuer and the investors party thereto at a purchase price of $1.53 per share.

(2) The reported securities are owned directly by PP VII. Polaris Management Co. VII, L.L.C. ("PMC VII") is the general partner of PP VII. Each of David Barrett, Brian Chee, Amir Nashat, a member of the Issuer's board of directors, and Bryce Youngren (collectively, the "PMC VII Managing Members") are the managing members of PMC VII. Each of PMC VII and the PMC VII Managing Members in their respective capacities with respect to PMC VII, may be deemed to have shared voting, investment and dispositive power with respect to the securities held by PP VII. Each of PMC VII and the PMC VII Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of the PMC VII Managing Members or PMC VII is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.

(3) The reported securities are owned directly by PEF VII. PMC VII is the general partner of PEF VII. Each of PMC VII and the PMC VII Managing Members in their respective capacities with respect to PMC VII, may be deemed to have shared voting, investment and dispositive power with respect to the securities held by PEF VII. Each of PMC VII and the PMC VII Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of the PMC VII Managing Members or PMC VII is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.

(4) The reported securities are owned directly by Polaris Partners X, L.P. ("PP X"). Polaris Partners GP X, L.L.C. ("PPGP X") is the general partner of PP X. Each of Amy Schulman and Brian Chee are the managing members of PPGP X (the "PPGP X Managing Members"). Amir Nashat ("Mr. Nashat"), a member of the Issuer's board of directors, is an interest holder of PPGP X. Each of PPGP X, the PPGP X Managing Members and Mr. Nashat, in their respective capacities with respect to PPGP X, may be deemed to have shared voting, investment and dispositive power with respect to the securities held by PP X. Each of PPGP X, the PPGP X Managing Members and Mr. Nashat disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of the PPGP X Managing Members, Mr. Nashat or PPGP X is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.

**Signature:** /s/ Lauren Crockett, as attorney-in-fact for Polaris Management Co. VII, L.L.C., general partner of Polaris Partners VII, L.P.  
**Date:** 2025-09-11

**Signature:** /s/ Lauren Crockett, as attorney-in-fact for Polaris Management Co. VII, L.L.C.  
**Date:** 2025-09-11

**Signature:** /s/ Lauren Crockett, as attorney-in-fact for Polaris Management Co. VII, L.L.C., general partner of Polaris Entrepreneurs' Fund VII, L.P.  
**Date:** 2025-09-11

**Signature:** /s/ Lauren Crockett, as general counsel of Polaris Partners GP X, L.L.C., general partner of Polaris Partners X, L.P.  
**Date:** 2025-09-11

**Signature:** /s/ Lauren Crockett, as general counsel of Polaris Partners GP X, L.L.C.  
**Date:** 2025-09-11

**Signature:** /s/ Lauren Crockett, as attorney-in-fact for Brian Chee  
**Date:** 2025-09-11

**Signature:** /s/ Lauren Crockett, as attorney-in-fact for Amy Schulman  
**Date:** 2025-09-11

### 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.**