# EDGAR Filing Document

**Accession Number:** 0001496323
**File Stem:** 0001104659-25-079312
**Filing Date:** 2025-8
**Character Count:** 14564
**Document Hash:** 762c0ac2d5d832883a6fd03a72d36217
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-079312.hdr.sgml**: 20250815

**ACCESSION NUMBER**: 0001104659-25-079312

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

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250815

**DATE AS OF CHANGE**: 20250815

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** IGM Biosciences, Inc.
- **CENTRAL INDEX KEY:** 0001496323
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 770349194
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-91132
- **FILM NUMBER:** 251225496

**BUSINESS ADDRESS:**
- **STREET 1:** 325 E MIDDLEFIELD ROAD
- **CITY:** MOUNTAIN VIEW
- **STATE:** CA
- **ZIP:** 94043
- **BUSINESS PHONE:** 650-965-7873

**MAIL ADDRESS:**
- **STREET 1:** 325 E MIDDLEFIELD ROAD
- **CITY:** MOUNTAIN VIEW
- **STATE:** CA
- **ZIP:** 94043

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Palingen, Inc.
- **DATE OF NAME CHANGE:** 20100712
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Redmile Group, LLC
- **CENTRAL INDEX KEY:** 0001425738

**ORGANIZATION NAME:**
- **EIN:** 208592298
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** ONE LETTERMAN DRIVE
- **STREET 2:** BUILDING D, SUITE D3-300
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94129
- **BUSINESS PHONE:** 415-489-9980

**MAIL ADDRESS:**
- **STREET 1:** ONE LETTERMAN DRIVE
- **STREET 2:** BUILDING D, SUITE D3-300
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94129

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 7)**

**IGM Biosciences, Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.01 per share**

*(Title of Class of Securities)*

**449585108**

*(CUSIP Number)*

**Redmile Group, LLC**<br>Attn: Joshua Garcia<br>One Letterman Drive Bldg D, Ste D3-300<br>San Francisco CA 94129<br>(415) 489-9980

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

**08/14/2025**

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

| **CUSIP No.** | **449585108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Redmile Group, LLC** | Name of reporting person<br>**Redmile Group, 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>**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>**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>**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>**0.0%** | Percent of class represented by amount in Row (11)<br>**0.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

**Comment for Reporting Person:** (1) The source of funds was working capital of certain private investment funds managed by Redmile Group, LLC (the "Redmile Funds").

(2) Percent of class is calculated based on 36,593,204 shares of Common Stock outstanding as of July 25, 2025 reported in the Issuer's quarterly report for the quarterly period ended June 30, 2025 on Form 10-Q as filed with the SEC on July 31, 2025 (the "Form 10-Q").

| **CUSIP No.** | **449585108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Jeremy C. Green** | Name of reporting person<br>**Jeremy C. Green** | |
| 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>**X0** | Citizenship or place of organization<br>**X0** | |
| 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>**0.0%** | Percent of class represented by amount in Row (11)<br>**0.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** (1) The source of funds was working capital of the Redmile Funds.

(2) Percent of class is calculated based on 36,593,204 shares of Common Stock outstanding as of July 25, 2025 reported in the Issuer's Form 10-Q.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.01 per share

**(b) Name of Issuer:**
IGM Biosciences, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
3 East Third Avenue, Suite 200, San Mateo, CA, 94401

**Item 4. Purpose of Transaction**

Item 4 of the Prior Schedule 13D is hereby amended and supplemented in its entirety by adding the following paragraphs prior to the last paragraph of Item 4:

The Tender Offer and the Merger

On August 14, 2025, pursuant to the terms of the previously announced agreement and plan of merger, dated June 1, 2025 (the "Merger Agreement"), by an among the Issuer, Concentra Biosciences, LLC, a Delaware limited liability company ("Parent"), and Concentra Merger Sub V, Inc., a Delaware corporation and a wholly owned subsidiary of Parent ("Merger Sub"), Merger Sub completed its tender offer (the "Offer") to acquire all of the Issuer's issued and outstanding Common Stock and Non-Voting Common Stock (the "Issuer Shares") in exchange for (a) a price per share of $1.247 in cash (the "Offer Price"), subject to applicable tax withholding and without interest, plus (b) one contingent value right ("CVR") per share subject to the terms and conditions of the CVR Agreement described below (the "Purchase Price"). The Offer was subject to certain conditions, including among others that more than 50% of the Issuer's outstanding Common Stock be validly tendered in the Offer, inclusive of the shares of Common Stock owned by Parent and its affiliates. The Offer expired one minute following 11:59 p.m., Eastern Time, on August 13, 2025 (the "Offer Closing"). Redmile and the Redmile Funds tendered 100% of their Issuer Shares to Merger Sub by the Offer Closing in exchange for the aggregate Purchase Price. The Issuer Shares tendered by Redmile and the Redmile Funds included (a) 2,952,131 shares of Common Stock, and (b) 7,199,325 shares of Non-Voting Common Stock.

On August 14, 2025, the Issuer completed the merger transaction with and into Merger Sub, with the Issuer surviving as a wholly owned subsidiary of Parent, pursuant to the terms of the Merger Agreement and applicable Delaware law (the "Merger"). At the effective time and date of the Merger (the "Merger Closing"), and without any action on the part of the Issuer stockholders, (a) each Issuer Share (other than those shares owned by (i) Parent, Merger Sub or any other Parent subsidiary after the Offer or (ii) any Issuer stockholders who are entitled to and who properly exercised their appraisal rights under Delaware law) automatically converted into the right to receive cash in the amount of the Offer Price; (b) each Pre-Funded Warrant was cancelled and the holder received the right to a cash amount based on the Offer Price, subject to applicable tax withholding and without interest, less the exercise price per share underlying the Pre-Funded Warrant, plus one CVR per underlying share subject to the terms and conditions of the CVR Agreement described below; (c) each in-the-money Option automatically vested and was cancelled and the holder received the right to a cash amount based on the Offer Price, subject to applicable tax withholding and without interest, less the exercise price per share underlying the Option, plus a CVR per underlying share subject to the terms and conditions of the CVR Agreement described below; and (d) each out-of-the-money Option was cancelled for no consideration. Immediately prior to the Merger Closing, Redmile beneficially owned 667,666 Pre-Funded Warrants, and all of the Options beneficially owned by Redmile were out-of-the-money.

Immediately prior to the Offer Closing Time, Redmile beneficially owned 12,712 shares of Common Stock issued pursuant to fully vested RSUs granted to Michael Lee, a managing director of Redmile, in connection with his service as a member of the Issuer's Board of Directors. All of such shares were tendered in the Offer in exchange for the aggregate Purchase Price. Pursuant to the policies of Redmile, Mr. Lee held the Common Stock issued pursuant to the RSUs as a nominee on behalf, and for the sole benefit, of Redmile and its affiliates, and assigned all economic, pecuniary and voting rights in respect of the Common Stock issued pursuant to the RSUs to Redmile. Redmile and Mr. Green each disclaim beneficial ownership of such securities, except to the extent of its or his pecuniary interest in such securities, if any, and this Schedule 13D shall not be deemed an admission that the Reporting Persons are the beneficial owner of such securities any purpose.

In connection with the Merger, Parent, Merger Sub and a rights agent entered into a contingent value rights agreement (the "CVR Agreement"), which provides that each CVR represents a contractual right to receive contingent cash payments equal to: (i) 100% of the amount by which Closing Net Cash (as finally determined pursuant to the Merger Agreement) exceeds $82.0 million, adjusted for any claims Parent reasonably determines to be valid five business days prior to the Merger Closing Date (as defined in the Merger Agreement) and that are not accounted for in such Closing Net Cash; and (ii) 80% of the Net Proceeds (as defined in the CVR Agreement), if any, from any sale, transfer, license or other disposition or grant of rights by Parent or any of its affiliates of all or any part of certain products and patents of the Issuer that occurs within the period beginning on the Merger Closing Date and ending on the first anniversary thereof.

The foregoing descriptions of the Merger Agreement and the CVR Agreement do not purport to be complete and are qualified in their entirety by reference to the Merger Agreement and Form of CVR Agreement, copies of which are filed as Exhibit 2.1 and Exhibit 10.1, respectively, in the Issuer's Form 8-K filed on July 1, 2025 and are incorporated herein by reference.

Resignation of Mike Lee from the Board of Directors

Pursuant to the terms of the Merger Agreement, Michael Lee resigned from the Issuer's Board of Directors effective immediately prior to the Merger Closing.

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

**(a)**
Redmile:
(1) Aggregate Number of Common Stock Beneficially Owned: 0
(2) Aggregate Percentage of Common Stock Beneficially Owned: 0.0%

Jeremy C. Green:
(1) Aggregate Number of Common Stock Beneficially Owned: 0
(2) Aggregate Percentage of Common Stock Beneficially Owned: 0.0%

**(b)**
Redmile:
(1) Sole Voting Power: 0
(2) Shared Voting Power: 0
(3) Sole Dispositive Power: 0
(4) Shared Dispositive Power: 0

Jeremy C. Green:
(1) Sole Voting Power: 0
(2) Shared Voting Power: 0
(3) Sole Dispositive Power: 0
(4) Shared Dispositive Power: 0

**(c)**
See the response to Item 4. Except as disclosed in Item 4, no reportable transactions were effected by any Reporting Persons during the past sixty days.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

The information in Item 4 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:** Redmile Group, LLC

**Signature:** /s/ Jeremy C. Green

**Name/Title:** Managing Member

**Date:** 08/15/2025

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:** Jeremy C. Green

**Signature:** /s/ Jeremy C. Green

**Name/Title:** Jeremy C. Green

**Date:** 08/15/2025