# EDGAR Filing Document

**Accession Number:** 0001782303
**File Stem:** 0001193125-26-273544
**Filing Date:** 2026-6
**Character Count:** 5550
**Document Hash:** 80de11c27c693c272790a8f9eb40282d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-273544.hdr.sgml**: 20260617

**ACCESSION NUMBER**: 0001193125-26-273544

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 9

**CONFORMED PERIOD OF REPORT**: 20260615

**ITEM INFORMATION**: Submission of Matters to a Vote of Security Holders

**FILED AS OF DATE**: 20260617

**DATE AS OF CHANGE**: 20260617

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Boundless Bio, Inc.
- **CENTRAL INDEX KEY:** 0001782303
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 830751369
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41989
- **FILM NUMBER:** 261096952

**BUSINESS ADDRESS:**
- **STREET 1:** 11099 NORTH TORREY PINES ROAD
- **STREET 2:** SUITE 150
- **CITY:** LA JOLLA
- **STATE:** CA
- **ZIP:** 92037
- **BUSINESS PHONE:** (858) 766-9912

**MAIL ADDRESS:**
- **STREET 1:** 11099 NORTH TORREY PINES ROAD
- **STREET 2:** SUITE 150
- **CITY:** LA JOLLA
- **STATE:** CA
- **ZIP:** 92037

?xml version='1.0' encoding='ASCII'? 8-K

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

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## FORM 8-K

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**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported):** June 15, 2026<br>

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Boundless Bio, Inc.

**(Exact Name of Registrant as Specified in Its Charter)**

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| | | |
|:---|:---|:---|
| Delaware | 001-41989 | 83-0751369 |
| **(State or Other Jurisdiction<br>of Incorporation)** | **(Commission File Number)** | **(IRS Employer<br>Identification No.)** |
| 11099 North Torrey Pines Road, Suite 150 |  |  |
| La Jolla**,** California |  | 92037 |
| **(Address of Principal Executive Offices)** |  | **(Zip Code)** |

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**Registrant's Telephone Number, Including Area Code:** (858) 766-9912<br>

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| |
|:---|
| 10955 Alexandria Way, Suite 100 |
| San **Diego,** California 92121 |

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**(Former Name or Former Address, if Changed Since Last Report)**

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

**Securities registered pursuant to Section 12(b) of the Act:**

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| | | |
|:---|:---|:---|
| **<br>Title of each class** | **Trading<br>Symbol(s)** | **<br>Name of each exchange on which registered** |
| Common Stock, par value $0.0001 per share | BOLD | Nasdaq Global Select Market |

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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## Item 5.07 Submission of Matters to a Vote of Security Holders.
At the annual meeting of stockholders of Boundless Bio, Inc. (the Company) held on June 15, 2026 (the Meeting), two proposals were voted upon by the Company's stockholders. The proposals are described in detail in the Company's definitive proxy statement for the Meeting filed with the U.S. Securities and Exchange Commission on April 28, 2026. Below is a brief description of, and the final results of the votes for, each proposal.

**Proposal 1**: Each of the director nominees was elected as a Class II director to hold office until the Company's 2029 annual meeting of stockholders, and until their respective successor is duly elected and qualified, by the votes set forth below.

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| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| *Nominee* | *Votes For* | *Votes For* | *Votes Withheld* | *Votes Withheld* | *Broker Non-Votes* | *Broker Non-Votes* |
| James Christensen, Ph.D. |  | 9,287,096 |  | 512,585 |  | 5,757,105 |
| Jennifer Lew |  | 9,271,084 |  | 528,597 |  | 5,757,105 |

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**Proposal 2:** The Company's stockholders ratified the appointment of KPMG LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2026 by the votes set forth below.

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| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| *Votes For* | *Votes For* | *Votes Against* | *Votes Against* | *Abstentions* | *Abstentions* | *Broker Non-Votes* | *Broker Non-Votes* |
|  | 15,376,973 |  | 127,747 |  | 52,066 |  |  |

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | | |
|:---|:---|:---|:---|
|  |  |  | **BOUNDLESS BIO, INC.** |
| Date: | June 17, 2026 | By:  | /s/ Jessica Oien |
|  |  |  | Name: Jessica Oien<br>Title: Chief Legal Officer and Corporate Secretary |

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