# EDGAR Filing Document

**Accession Number:** 0001865494
**File Stem:** 0001591046-26-000008
**Filing Date:** 2026-6
**Character Count:** 7784
**Document Hash:** f8a79f2bd743a124ba6fd3bcb2330c40
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001591046-26-000008.hdr.sgml**: 20260602

**ACCESSION NUMBER**: 0001591046-26-000008

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

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260602

**DATE AS OF CHANGE**: 20260602

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** IO Biotech, Inc.
- **CENTRAL INDEX KEY:** 0001865494
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 870909276
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-93023
- **FILM NUMBER:** 261055982

**BUSINESS ADDRESS:**
- **STREET 1:** OLE MAALOES VEH 3
- **CITY:** COPENHAGEN
- **STATE:** G7
- **ZIP:** 2200
- **BUSINESS PHONE:** 4570702980

**MAIL ADDRESS:**
- **STREET 1:** OLE MAALOES VEH 3
- **CITY:** COPENHAGEN
- **STATE:** G7
- **ZIP:** 2200
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Lundbeckfond Invest A/S
- **CENTRAL INDEX KEY:** 0001591046

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** G7
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** SCHERFIGSVEJ 7
- **CITY:** COPENHAGEN
- **STATE:** G7
- **ZIP:** DK-2100
- **BUSINESS PHONE:** 4540307375

**MAIL ADDRESS:**
- **STREET 1:** SCHERFIGSVEJ 7
- **CITY:** COPENHAGEN
- **STATE:** G7
- **ZIP:** DK-2100

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 2)**

**IO Biotech, Inc.**

*(Name of Issuer)*

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

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Christian Elling**<br>c/o Lundbeckfond Invest A/S<br>Scherfigsvej 7<br>Copenhagen G7 DK-2100<br>45 2062 1276

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

**03/31/2026**

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

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Lundbeckfond Invest A/S** | Name of reporting person<br>**Lundbeckfond Invest A/S** | |
| 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>**G7** | Citizenship or place of organization<br>**G7** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**21851920.00** |
| 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>**21851920.00** |
| 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>**21851920.00** | Aggregate amount beneficially owned by each reporting person<br>**21851920.00** | |
| 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>**27.4%** | Percent of class represented by amount in Row (11)<br>**27.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Item 1. Security and Issuer**

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

**(b) Name of Issuer:**
IO Biotech, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
Ole Maaloes Vej 3, Copenhagen N, G7, DK-2200

This Amendment No. 2 (this "Amendment No. 2" or this "Schedule 13D/A") amends and supplements the statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") on November 19, 2021, and amended on August 14, 2023 (as amended, the "Statement") by the Reporting Persons. Unless otherwise defined herein, capitalized terms used in this Amendment No. 2 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 March 31, 2026, the Issuer ceased operations and filed a voluntary petition for relief (the "Petition") under the provisions of Chapter 7 of Title 11 of the United States Code (the "Bankruptcy Code") in the United States Bankruptcy Court for the District of Delaware. The assets of the Issuer will be liquidated and claims paid in accordance with the priorities specified in the Bankruptcy Code. Concurrently with the Petition, on March 31, 2026, each member of the Issuer's board of directors, including Christian Elling, resigned from the Board of Directors of the Issuer and all of its committees.

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

**(a)**
Rows 11 and 13 of the Reporting Person's cover page to this Schedule 13D/A set forth the aggregate number of shares of common stock and percentages of the shares of common stock beneficially owned by the Reporting Person and are incorporated by reference. The percentage set forth in each row 13 is based upon 71,948,842 shares of common stock outstanding as of November 10, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on November 14, 2025, and giving effect to Warrants, to the extent exercisable within 60 days hereof, as referenced herein.

The Reporting Person directly holds 13,950,686 shares of common stock and 7,901,234 shares of common stock issuable upon exercise of Warrants.

The board of directors of the Reporting Person, consisting of Steffen Kragh, Lars Holmqvist, Susanne Kruger Kjaer, Michael Kjaer, Peter Schutze, Gunhild Waldemar, Svend Andersen, Ludovic Tranholm Otterbein, Vagn Flink Moller Pedersen and Kristian Funding Andersen, and Lene Skole, the chief executive officer of the Reporting Person, may be deemed to share voting and investment authority over the shares held by the Reporting Person. No individual member of the board of directors of the Reporting Person is deemed to hold any beneficial ownership in the shares held by the Reporting Person.

**(b)**
Rows 7 through 10 of the Reporting Person's cover page to this Schedule 13D/A set forth the number of shares of common stock as to which the Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition and are incorporated by reference.

**(c)**
The Reporting Person has not effected any transaction with respect to the securities of the Issuer during the sixty days prior to the date of filing this Schedule 13D/A.

### 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:** Lundbeckfond Invest A/S

**Signature:** /s/ Christian Elling

**Name/Title:** By Christian Elling, Managing Partner

**Date:** 06/02/2026