# EDGAR Filing Document

**Accession Number:** 0001835579
**File Stem:** 0001415889-25-020462
**Filing Date:** 2025-7
**Character Count:** 32287
**Document Hash:** 78058a4a5d63eaeaa18d96a94dedb926
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001415889-25-020462.hdr.sgml**: 20250729

**ACCESSION NUMBER**: 0001415889-25-020462

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

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250729

**DATE AS OF CHANGE**: 20250729

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ImageneBio, Inc.
- **CENTRAL INDEX KEY:** 0001835579
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 811697316
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92449
- **FILM NUMBER:** 251162457

**BUSINESS ADDRESS:**
- **STREET 1:** 12526 HIGH BLUFF DRIVE
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92130
- **BUSINESS PHONE:** 857-343-8292

**MAIL ADDRESS:**
- **STREET 1:** 12526 HIGH BLUFF DRIVE
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92130

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Ikena Oncology, Inc.
- **DATE OF NAME CHANGE:** 20201208
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Atlas Venture Fund X, L.P.
- **CENTRAL INDEX KEY:** 0001628098

**ORGANIZATION NAME:**
- **EIN:** 472435989
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** 400 TECHNOLOGY SQUARE
- **STREET 2:** 10TH FLOOR
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02139
- **BUSINESS PHONE:** 857-201-2700

**MAIL ADDRESS:**
- **STREET 1:** 400 TECHNOLOGY SQUARE
- **STREET 2:** 10TH FLOOR
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02139

## Exhibit 99.1

**Exhibit 99.1**

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) promulgated pursuant to the Securities Exchange Act of 1934, as amended, the undersigned agree that the attached Schedule 13D is being filed on behalf of each of the undersigned.

Date: July 29, 2025

---

| | |
|:---|:---|
| **Atlas Venture Fund X, L.P.** | **Atlas Venture Fund X, L.P.** |
| By:  | Atlas Venture Associates X, L.P., its general partner |
| By: | Atlas Venture Associates X, LLC, its general partner |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |
| **Atlas Venture Associates X, L.P.** | **Atlas Venture Associates X, L.P.** |
| By: | Atlas Venture Associates X, LLC, its general partner |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |
| **Atlas Venture Associates X, LLC** | **Atlas Venture Associates X, LLC** |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |
| **Atlas Venture Fund XI, L.P.** | **Atlas Venture Fund XI, L.P.** |
| By:  | Atlas Venture Associates XI, L.P., its general partner |
| By: | Atlas Venture Associates XI, LLC, its general partner |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |
| **Atlas Venture Associates XI, L.P.** | **Atlas Venture Associates XI, L.P.** |
| By: | Atlas Venture Associates XI, LLC, its general partner |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |
| **Atlas Venture Associates XI, LLC** | **Atlas Venture Associates XI, LLC** |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |

---

------

---

| | |
|:---|:---|
| **Atlas Venture Opportunity Fund I, L.P.** | **Atlas Venture Opportunity Fund I, L.P.** |
| By:  | Atlas Venture Associates Opportunity I, L.P., its general partner |
| By: | Atlas Venture Associates Opportunity I, LLC, its general partner |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |
| **Atlas Venture Associates Opportunity I, L.P.** | **Atlas Venture Associates Opportunity I, L.P.** |
| By: | Atlas Venture Associates Opportunity I, LLC, its general partner |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |

---

---

| | |
|:---|:---|
| **Atlas Venture Associates Opportunity I, LLC** | **Atlas Venture Associates Opportunity I, LLC** |
| By: <u>/s/ Ommer Chohan</u> | By: <u>/s/ Ommer Chohan</u> |
| Name:  | Ommer Chohan |
| Title: | Chief Financial Officer |

---

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 1)**

**IMAGENEBIO, INC.**

*(Name of Issuer)*

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

*(Title of Class of Securities)*

**45175G207**

*(CUSIP Number)*

**Ommer Chohan, CFO**<br>300 Technology Square, 8th Floor<br>Cambridge MA 02139<br>(857) 201-2700

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

**07/25/2025**

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

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Fund X, L.P.** | Name of reporting person<br>**Atlas Venture Fund X, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**241800.00** |
| 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>**241800.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**241800.00** | Aggregate amount beneficially owned by each reporting person<br>**241800.00** | |
| 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>**2.1%** | Percent of class represented by amount in Row (11)<br>**2.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**ATLAS VENTURE ASSOCIATES X, L.P.** | Name of reporting person<br>**ATLAS VENTURE ASSOCIATES X, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**241800.00** |
| 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>**241800.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**241800.00** | Aggregate amount beneficially owned by each reporting person<br>**241800.00** | |
| 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>**2.1%** | Percent of class represented by amount in Row (11)<br>**2.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Associates X, LLC** | Name of reporting person<br>**Atlas Venture Associates X, LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**241800.00** |
| 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>**241800.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**241800.00** | Aggregate amount beneficially owned by each reporting person<br>**241800.00** | |
| 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>**2.1%** | Percent of class represented by amount in Row (11)<br>**2.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Fund XI, L.P.** | Name of reporting person<br>**Atlas Venture Fund XI, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**103494.00** |
| 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>**103494.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**103494.00** | Aggregate amount beneficially owned by each reporting person<br>**103494.00** | |
| 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>**0.9%** | Percent of class represented by amount in Row (11)<br>**0.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Associates XI, L.P.** | Name of reporting person<br>**Atlas Venture Associates XI, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**103494.00** |
| 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>**103494.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**103494.00** | Aggregate amount beneficially owned by each reporting person<br>**103494.00** | |
| 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>**0.9%** | Percent of class represented by amount in Row (11)<br>**0.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Associates XI, LLC** | Name of reporting person<br>**Atlas Venture Associates XI, LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**103494.00** |
| 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>**103494.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**103494.00** | Aggregate amount beneficially owned by each reporting person<br>**103494.00** | |
| 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>**0.9%** | Percent of class represented by amount in Row (11)<br>**0.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Opportunity Fund I, L.P.** | Name of reporting person<br>**Atlas Venture Opportunity Fund I, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**72885.00** |
| 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>**72885.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**72885.00** | Aggregate amount beneficially owned by each reporting person<br>**72885.00** | |
| 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>**0.6%** | Percent of class represented by amount in Row (11)<br>**0.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Associates Opportunity I, L.P.** | Name of reporting person<br>**Atlas Venture Associates Opportunity I, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**72885.00** |
| 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>**72885.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**72885.00** | Aggregate amount beneficially owned by each reporting person<br>**72885.00** | |
| 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>**0.6%** | Percent of class represented by amount in Row (11)<br>**0.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **45175G207** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Atlas Venture Associates Opportunity I, LLC** | Name of reporting person<br>**Atlas Venture Associates Opportunity I, LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (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>**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>**72885.00** |
| 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>**72885.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**72885.00** | Aggregate amount beneficially owned by each reporting person<br>**72885.00** | |
| 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>**0.6%** | Percent of class represented by amount in Row (11)<br>**0.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Item 1. Security and Issuer**

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

**(b) Name of Issuer:**
IMAGENEBIO, INC.

**(c) Address of Issuer's Principal Executive Offices:**
12526 High Bluff Drive, Suite 345, San Diego, CA, 92130

Item 1 of the Statement is amended and supplemented as follows:

This Amendment No. 1 (this "Amendment No. 1" or this "Schedule 13D/A") amends and supplements the statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") on February 11, 2022, (as amended, the "Statement") by the Reporting Persons. Unless otherwise defined herein, capitalized terms used in this Amendment No. 1 shall have the meanings ascribed to them in the Statement. Unless amended or supplemented below, the information in the Statement remains unchanged.

**Item 4. Purpose of Transaction**

Item 4 of the Statement is hereby amended and supplemented as follows:

On December 23, 2024, Ikena, Insight Merger Sub I, an exempted company with limited liability incorporated and existing under the laws of the Cayman Islands and direct wholly owned subsidiary of Ikena ("Merger Sub I"), Insight Merger Sub II, an exempted company with limited liability incorporated and existing under the laws of the Cayman Islands and direct wholly owned subsidiary of Ikena ("Merger Sub II"), and Inmagene Biopharmaceuticals, an exempted company with limited liability incorporated and existing under the laws of the Cayman Islands (the "Inmagene"), entered into an Agreement and Plan of Merger (the "Merger Agreement"), pursuant to which, among other matters, and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub I merged with and into Inmagene, pursuant to which Merger Sub I ceased to exist and was struck off the Register of Companies by the Registrar of Companies in the Cayman Islands (the "Registrar of Companies"), with Inmagene surviving (the "Surviving Entity") such merger as a direct, wholly owned subsidiary of Ikena (the "First Merger"), and immediately after the First Merger, the Surviving Entity merged with and into Merger Sub II, pursuant to which Inmagene ceased to exist and was struck off the Register of Companies by the Registrar of Companies, with Merger Sub II surviving such merger as a direct, wholly owned subsidiary of Ikena (the "Second Merger" and, collectively with the First Merger, as appropriate, the "Merger").

On July 15, 2025, Ikena held its annual meeting of Ikena stockholders at which Ikena's stockholders approved the Merger, along with a reverse stock split of Ikena's common stock to be with the final ratio to be mutually agreed to by Ikena and Inmagene.

On July 25, 2025, the reverse stock split was effected at a ratio of 1-for-12, the Merger closed and Ikena changed its name to "ImageneBio, Inc."

The Reporting Persons are filing this Amendment No. 1 to report the dilution of their beneficial ownership by virtue of the completion of the Merger.

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

**(a)**
As of the date hereof, Atlas X is the record owner of 241,800 shares of Common Stock. AVA X LP is the general partner of Atlas X and AVA X LLC is the general partner of AVA X LP. Each of Atlas X, AVA X LP and AVA X LLC has shared voting and dispositive power over the shares held by Atlas X. As such, each of Atlas X, AVA X LP and AVA X LLC may be deemed to beneficially own the shares held by Atlas X.

As of the date hereof, Atlas XI is the record owner of 103,494 shares of Common Stock. AVA XI LP is the general partner of Atlas XI and AVA XI LLC is the general partner of AVA XI LP. Each of Atlas XI, AVA XI LP and AVA XI LLC has shared voting and dispositive power over the shares held by Atlas XI. As such, each of Atlas XI, AVA XI LP and AVA XI LLC may be deemed to beneficially own the shares held by Atlas XI.

As of the date hereof, AVOF is the record owner of 72,885 shares of Common Stock. AVAO LP is the general partner of AVOF and AVAO LLC is the general partner of AVAO LP. Each of AVOF, AVAO LP and AVAO LLC has shared voting and dispositive power over the shares held by AVOF. As such, each of AVOF, AVAO LP and AVAO LLC may be deemed to beneficially own the shares held by AVOF.

Each of the Fund X Reporting Persons, Fund XI Reporting Persons and Opportunity Fund Reporting Persons may be deemed to beneficially own 2.1%, 0.9% and 0.6%, respectively, of the Issuer's outstanding Common Stock, which percentages are calculated based upon approximately 11,600,000 outstanding shares of Common Stock of the Issuer as of July 25, 2025, as reported in the Issuer's Current Report on Form 8-K and filed with the Securities and Exchange Commission on July 25, 2025.

Collectively, the Reporting Persons beneficially own an aggregate of 418,179 shares of Common Stock, which represents 3.6% of the Issuer's outstanding Common Stock. The Fund X Reporting Persons, Fund XI Reporting Persons and the Opportunity Fund Reporting Persons are under common control and as a result, the Reporting Persons may be deemed to be members of a group. However, the Reporting Persons disclaim such group membership, and this Schedule 13D shall not be deemed an admission that the Reporting Persons are members of a group for purposes of Section 13 or for any other purposes.

**(b)**
As of the date hereof, each of Atlas X, AVA X LP and AVA X LLC have shared voting power and shared dispositive power over 241,800 shares of Common Stock.

As of the date hereof, each of Atlas XI, AVA XI LP and AVA XI LLC have shared voting power and shared dispositive power over 103,494 shares of Common Stock.

As of the date hereof, each of AVOF, AVAO LP and AVAO LLC have shared voting power and shared dispositive power over 72,885 shares of Common Stock.

**(c)**
None of the Reporting Persons have purchased or sold any shares of Common Stock during the past 60 days.

### 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:** Atlas Venture Fund X, L.P.

**Signature:** /s/ Ommer Chohan

**Name/Title:** By: Atlas Venture Associates X, L.P., its general partner, By: Atlas Venture Associates X, LLC, its general partner, By: Ommer Chohan, its CFO

**Date:** 07/29/2025

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:** ATLAS VENTURE ASSOCIATES X, L.P.

**Signature:** /s/ Ommer Chohan

**Name/Title:** By: Atlas Venture Associates X, LLC, its general partner, By: Ommer Chohan, its CFO

**Date:** 07/29/2025

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:** Atlas Venture Associates X, LLC

**Signature:** /s/ Ommer Chohan

**Name/Title:** Ommer Chohan, CFO

**Date:** 07/29/2025

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:** Atlas Venture Fund XI, L.P.

**Signature:** /s/ Ommer Chohan

**Name/Title:** By: Atlas Venture Associates XI, L.P., its general partner, By: Atlas Venture Associates XI, LLC, its general partner, By: Ommer Chohan, its CFO

**Date:** 07/29/2025

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:** Atlas Venture Associates XI, L.P.

**Signature:** /s/ Ommer Chohan

**Name/Title:** By: Atlas Venture Associates XI, LLC, its general partner, By: Ommer Chohan, its CFO

**Date:** 07/29/2025

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:** Atlas Venture Associates XI, LLC

**Signature:** /s/ Ommer Chohan

**Name/Title:** Ommer Chohan, CFO

**Date:** 07/29/2025

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:** Atlas Venture Opportunity Fund I, L.P.

**Signature:** /s/ Ommer Chohan

**Name/Title:** By: Atlas Venture Associates Opportunity I L.P., its GP, By: Atlas Venture Associates Opportunity I LLC, its GP, By: Ommer Chohan, its CFO

**Date:** 07/29/2025

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:** Atlas Venture Associates Opportunity I, L.P.

**Signature:** /s/ Ommer Chohan

**Name/Title:** By: Atlas Venture Associates Opportunity I LLC, its general partner, By: Ommer Chohan, its CFO

**Date:** 07/29/2025

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:** Atlas Venture Associates Opportunity I, LLC

**Signature:** /s/ Ommer Chohan

**Name/Title:** Ommer Chohan, CFO

**Date:** 07/29/2025