# EDGAR Filing Document

**Accession Number:** 0001055951
**File Stem:** 0000947871-25-000619
**Filing Date:** 2025-6
**Character Count:** 30270
**Document Hash:** 185a31bc8dbaa85062ad0b92cb227711
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000947871-25-000619.hdr.sgml**: 20250618

**ACCESSION NUMBER**: 0000947871-25-000619

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

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250618

**DATE AS OF CHANGE**: 20250618

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Ikena Oncology, Inc.
- **CENTRAL INDEX KEY:** 0001835579
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92449
- **FILM NUMBER:** 251058737

**BUSINESS ADDRESS:**
- **STREET 1:** 50 NORTHERN AVE.
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 857-343-8292

**MAIL ADDRESS:**
- **STREET 1:** 50 NORTHERN AVE.
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ORBIMED ADVISORS LLC
- **CENTRAL INDEX KEY:** 0001055951

**ORGANIZATION NAME:**
- **EIN:** 133976876
- **STATE OF INCORPORATION:** DE

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

**BUSINESS ADDRESS:**
- **STREET 1:** 601 LEXINGTON AVENUE
- **STREET 2:** 54TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 739-6400

**MAIL ADDRESS:**
- **STREET 1:** 601 LEXINGTON AVENUE
- **STREET 2:** 54TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022

## Exhibit 99.1

**<u>Exhibit 1</u>**

JOINT FILING AGREEMENT

The undersigned hereby agree that Amendment No. 4 to the Statement on Schedule 13D, dated June 14, 2025, with respect to the common stock of Ikena Oncology, Inc., is filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. Each of the undersigned agrees to be responsible for the timely filing of this Statement, and for the completeness and accuracy of the information concerning itself contained therein. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the 18h day of June 2025.

---

| | |
|:---|:---|
| **ORBIMED ADVISORS LLC** | **ORBIMED ADVISORS LLC** |
| By: | /s/ Carl L. Gordon |
|  | Name: Carl L. Gordon<br>Title: Member |

---

---

| | |
|:---|:---|
| **ORBIMED CAPITAL GP VI LLC** | **ORBIMED CAPITAL GP VI LLC** |
| By: | ORBIMED ADVISORS LLC, its managing member |
| By: | /s/ Carl L. Gordon |
|  | Name: Carl L. Gordon<br>Title: Member of OrbiMed Advisors LLC |

---

---

| | |
|:---|:---|
| **ORBIMED GENESIS GP LLC** | **ORBIMED GENESIS GP LLC** |
| By: | ORBIMED ADVISORS LLC, its managing member |
| By: | /s/ Carl L. Gordon |
|  | Name: Carl L. Gordon<br>Title: Member of OrbiMed Advisors LLC |

---

---

| | |
|:---|:---|
| **ORBIMED CAPITAL LLC** | **ORBIMED CAPITAL LLC** |
| By: | /s/ Carl L. Gordon |
|  | Name: Carl L. Gordon<br>Title: Member |

---

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 4)**

**Ikena Oncology, Inc.**

*(Name of Issuer)*

**COMMON STOCK**

*(Title of Class of Securities)*

**45175G108**

*(CUSIP Number)*

**OrbiMed Advisors LLC**<br>601 Lexington Avenue, 54th Floor<br>New York NY 10022<br>(212) 739-6400

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

**06/14/2025**

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

| **CUSIP No.** | **45175G108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**ORBIMED ADVISORS LLC** | Name of reporting person<br>**ORBIMED ADVISORS 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>**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>**8008913.00** |
| 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>**8008913.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**8008913.00** | Aggregate amount beneficially owned by each reporting person<br>**8008913.00** | |
| 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>**16.71%** | Percent of class represented by amount in Row (11)<br>**16.71%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

| **CUSIP No.** | **45175G108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**ORBIMED CAPITAL GP VI LLC** | Name of reporting person<br>**ORBIMED CAPITAL GP VI 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>**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>**7768790.00** |
| 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>**7768790.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**7768790.00** | Aggregate amount beneficially owned by each reporting person<br>**7768790.00** | |
| 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>**16.21%** | Percent of class represented by amount in Row (11)<br>**16.21%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **45175G108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**OrbiMed Genesis GP LLC** | Name of reporting person<br>**OrbiMed Genesis GP 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>**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>**240123.00** |
| 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>**240123.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**240123.00** | Aggregate amount beneficially owned by each reporting person<br>**240123.00** | |
| 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>**0.50%** | Percent of class represented by amount in Row (11)<br>**0.50%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **45175G108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**ORBIMED CAPITAL LLC** | Name of reporting person<br>**ORBIMED CAPITAL 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>**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>**1572638.00** |
| 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>**1572638.00** |
| 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>**1572638.00** | Aggregate amount beneficially owned by each reporting person<br>**1572638.00** | |
| 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>**3.28%** | Percent of class represented by amount in Row (11)<br>**3.28%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
COMMON STOCK

**(b) Name of Issuer:**
Ikena Oncology, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
645 Summer Street, Suite 101, Boston, MA, 02210

This Amendment No. 4 ("Amendment No. 4") to Schedule 13D supplements and amends the Statement on Schedule 13D filed by OrbiMed Advisors LLC ("OrbiMed Advisors"), OrbiMed Capital GP VI LLC ("OrbiMed GP"), OrbiMed Genesis GP LLC ("OrbiMed Genesis"), and OrbiMed Capital LLC ("OrbiMed Capital") (collectively, the "Reporting Persons") originally filed with the Securities and Exchange Commission (the "SEC") on April 15, 2021, as amended by Amendment No. 1 filed with the SEC on August 16, 2021, Amendment No. 2 filed with the SEC on September 14, 2023 and Amendment No. 3 filed with the SEC on September 21, 2023.

On June 14, 2025, OPI VI, Genesis and WWH (each as defined below) sent written notice to the Issuer of their increase of the beneficial ownership limitation on their outstanding Shares to 19.99%. Due to the increase in the blocker, 6,042,193 Non-Voting Shares owned by the Reporting Person will convert to Shares on the 61st day after the date of the notice. As a result, the percentage of outstanding Shares that the Reporting Persons may be deemed to beneficially own increased by more than 1%.

**Item 4. Purpose of Transaction**

The Reporting Persons from time to time intend to review their investment in the Issuer on the basis of various factors, including the Issuer's business, financial condition, results of operations and prospects, general economic and industry conditions, the securities markets in general and those for the Issuer's Shares in particular, as well as other developments and other investment opportunities. Based upon such review, the Reporting Persons will take such actions in the future as the Reporting Persons may deem appropriate in light of the circumstances existing from time to time. If the Reporting Persons believe that further investment in the Issuer is attractive, whether because of the market price of Shares or otherwise, they may acquire Shares or other securities of the Issuer either in the open market or in privately negotiated transactions. Similarly, depending on market and other factors, the Reporting Persons may determine to dispose of some or all of the Shares currently owned by the Reporting Persons or otherwise acquired by the Reporting Persons either in the open market or in privately negotiated transactions.

Except as set forth in this Schedule 13D, the Reporting Persons have not formulated any plans or proposals which relate to or would result in:  (a) the acquisition by any person of additional securities of the Issuer or the disposition of securities of the Issuer, (b) an extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries, (c) a sale or transfer of a material amount of the assets of the Issuer or any of its subsidiaries, (d) any change in the present Board of Directors or management of the Issuer, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the board, (e) any material change in the Issuer's capitalization or dividend policy of the Issuer, (f) any other material change in the Issuer's business or corporate structure, (g) any change in the Issuer's charter or bylaws or other instrument corresponding thereto or other action which may impede the acquisition of control of the Issuer by any person, (h) causing a class of the Issuer's securities to be deregistered or delisted from a national securities exchange or to cease to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association, (i) a class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Act or (j) any action similar to any of those enumerated above.

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

**(a)**
The following disclosure is based upon 47,931,718 outstanding Shares, which amount includes 6,042,193 Non-Voting Shares that are convertible to Shares, as set forth in the Issuer's Rule 424(b)(3) Prospectus filed with the SEC on June 11, 2025, and excludes 326,394 Non-Voting Shares that are outstanding.

As of the date of this filing, OPI VI holds 7,768,790 Shares, which amount includes 5,317,501 Non-Voting Shares that are convertible to Shares, constituting approximately 16.21% of the issued and outstanding Shares. In addition, OPI VI holds 264,643 Non-Voting Shares. OrbiMed GP is the general partner of OPI VI, pursuant to the terms of the limited partnership agreement of OPI VI, and OrbiMed Advisors is the managing member of OrbiMed GP, pursuant to the terms of the limited liability company agreement of OrbiMed GP. As a result, OrbiMed Advisors and OrbiMed GP share power to direct the vote and disposition of the Shares held by OPI VI and may be deemed directly or indirectly, including by reason of their mutual affiliation, to be the beneficial owners of the Shares held by OPI VI. OrbiMed Advisors exercises this investment and voting power through a management committee comprised of Carl L. Gordon, Sven H. Borho, and W. Carter Neild, each of whom disclaims beneficial ownership of the Shares held by OPI VI.

In addition, OrbiMed Advisors and OrbiMed GP, pursuant to their authority under the limited partnership agreement of OPI VI, caused OPI VI to enter into the agreements referred to in Item 6 below.

As of the date of this filing, Genesis holds 240,123 Shares, which amount includes 149,109 Non-Voting Shares that are convertible to Shares, constituting approximately 0.50% of the issued and outstanding Shares. In addition, Genesis holds 8,179 Non-Voting Shares. OrbiMed Genesis is the general partner of Genesis, pursuant to the terms of the limited partnership agreement of Genesis, and OrbiMed Advisors is the managing member of OrbiMed Genesis, pursuant to the terms of the limited liability company agreement of OrbiMed Genesis. As a result, OrbiMed Advisors and OrbiMed Genesis share power to direct the vote and disposition of the Shares held by Genesis and may be deemed, directly or indirectly, including by reason of their mutual affiliation, to be the beneficial owners of the Shares held by Genesis. OrbiMed Advisors exercises this investment and voting power through a management committee comprised of Carl L. Gordon, Sven H. Borho, and W. Carter Neild, each of whom disclaims beneficial ownership of the Shares held by Genesis.

In addition, OrbiMed Advisors and OrbiMed Genesis, pursuant to their authority under the limited partnership agreement of Genesis, caused Genesis to enter into the agreements referred to in Item 6 below.

As of the date of this filing, WWH holds 1,572,638 Shares, which amount includes 575,583 Non-Voting Shares that are convertible to Shares, constituting approximately 3.28% of the issued and outstanding Shares. In addition, WWH holds 53,572 Non-Voting Shares. OrbiMed Capital is the investment advisor of WWH. As a result, OrbiMed Capital has the power to direct the vote and disposition of the Shares held by WWH and may be deemed directly or indirectly, including by reason of mutual affiliation, to be the beneficial owner of the Shares held by WWH. OrbiMed Capital disclaims any beneficial ownership over the shares of the other Reporting Persons. OrbiMed Capital exercises this investment and voting power through a management committee comprised of Carl L. Gordon, Sven H. Borho, and W. Carter Neild, each of whom disclaims beneficial ownership of the Shares held by WWH.

**(b)**
Item 5(a) is incorporated by reference herein.

**(c)**
Not applicable.

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

In addition to the relationships between the Reporting Persons described in Items 2 and 5 above, OrbiMed GP is the general partner of OPI VI, pursuant to the terms of the limited partnership agreement of OPI VI. Pursuant to this agreement and relationship, OrbiMed GP has discretionary investment management authority with respect to the assets of OPI VI. Such authority includes the power to vote and otherwise dispose of securities held by OPI VI. The number of outstanding Shares of the Issuer attributable to OPI VI is 7,768,790 Shares, which amount includes 5,317,501 Non-Voting Shares that are convertible to Shares. In addition, OPI VI holds 264,643 Non-Voting Shares. OrbiMed GP, pursuant to its authority under the limited partnership agreement of OPI VI, may be considered to hold indirectly 7,768,790 Shares, which amount includes 5,317,501 Non-Voting Shares that are convertible to Shares, and 264,643 Non-Voting Shares.

In addition to the relationships between the Reporting Persons described in Items 2 and 5 above, OrbiMed Genesis is the general partner of Genesis, pursuant to the terms of the limited partnership agreement of Genesis. Pursuant to this agreement and relationship, OrbiMed Genesis has discretionary investment management authority with respect to the assets of Genesis. Such authority includes the power to vote and otherwise dispose of securities held by Genesis. The number of outstanding Shares of the Issuer attributable to Genesis is 240,123, which amount includes 149,109 Non-Voting Shares that are convertible to Shares. In addition, Genesis holds 8,179 Non-Voting Shares. OrbiMed Genesis, pursuant to its authority under the limited partnership agreement of Genesis, may be considered to hold indirectly 240,123 Shares, which amount includes 149,109 Non-Voting Shares that are convertible to Shares, and 8,179 Non-Voting Shares.

In addition to the relationships between the Reporting Persons described in Items 2 and 5 above, OrbiMed Advisors is the managing member of OrbiMed GP and OrbiMed Genesis, pursuant to the terms of the limited liability company agreements of OrbiMed GP and OrbiMed Genesis. Pursuant to these agreements and relationships, OrbiMed Advisors and OrbiMed GP have discretionary investment management authority with respect to the assets of OPI VI. OrbiMed Advisors and OrbiMed Genesis have discretionary investment management authority with respect to the assets of Genesis. Such authority includes the power of OrbiMed GP to vote and otherwise dispose of securities held by OPI VI and the power of OrbiMed Genesis to vote and otherwise dispose of the securities held by Genesis. The number of outstanding Shares attributable to OPI VI is 7,768,790 Shares, which amount includes 5,317,501 Non-Voting Shares that are convertible to Shares, and the number of Shares attributed to Genesis is 240,123 Shares, which amount includes 149,109 Non-Voting Shares that are convertible to Shares. In addition, OPI VI holds 264,643 Non-Voting Shares and Genesis holds 8,179 Non-Voting Shares. OrbiMed Advisors, pursuant to its authority under the terms of the limited liability company agreements of OrbiMed GP and OrbiMed Genesis, may also be considered to hold indirectly 8,008,913 Shares, which amount includes 5,466,610 Non-Voting Shares that are convertible to Shares, and 272,822 Non-Voting Shares.

OrbiMed Capital is the investment advisor to WWH. OrbiMed Capital may be deemed to have voting and investment power over the securities held by WWH. Such authority includes the power of OrbiMed Capital to vote and otherwise dispose of securities held by WWH. The number of outstanding Shares attributable to WWH is 1,572,638 Shares, which amount includes 575,583 Non-Voting Shares that are convertible to Shares. In addition, WWH holds 53,572 Non-Voting Shares. OrbiMed Capital, as the investment advisor to WWH, may also be considered to hold indirectly 1,572,638 Shares, which amount includes 575,583 Non-Voting Shares that are convertible to Shares, and 53,572 Non-Voting Shares.

David P. Bonita ("Bonita"), a member of OrbiMed Advisors, is a member of the Board of Directors of the Issuer and, accordingly, OrbiMed Advisors and OrbiMed GP may have the ability to affect and influence control of the Issuer. From time to time, Bonita may receive stock options or other awards of equity-based compensation pursuant to the Issuer's compensation arrangements for non-employee directors. Pursuant to an agreement with OrbiMed Advisors and OrbiMed GP, Bonita is obligated to transfer any securities issued under any such stock options or other awards, or the economic benefit thereof, to OrbiMed Advisors and OrbiMed GP, which will in turn ensure that such securities or economic benefits are provided to OPI VI.

Investors' Rights Agreement

In addition, OPI VI, WWH, Genesis, and certain other stockholders of the Issuer entered into a Fourth Amended and Restated Investors' Rights Agreement with the Issuer (the "Investors' Rights Agreement"), dated as of December 18, 2020. Pursuant to the Investors' Rights Agreement and subject to the terms and conditions therein, the parties agreed that:

Demand Registration Rights

At any time beginning six months following the date of the effective date of the registration statement of the Issuer's initial public offering, the holders of at least 40% of the registrable securities then outstanding of the Issuer may make a written request that the Issuer register at least 20% their registrable securities (or a lesser percent if the anticipated aggregate offering price, net of expenses, would exceed $10 million). The Issuer is required to use commercially reasonable efforts to effect the registration and will pay all registration expenses, other than underwriting discounts and commissions, related to any demand registration. The Issuer is not obligated to effect more than two of these registrations.

Piggyback Registration Rights

Whenever the Issuer proposes to file a registration statement under the Securities Act, including a registration statement on Form S-3 as discussed below, other than with respect to certain excluded registrations, OPI VI, WWH, and Genesis will be entitled to notice of the registration and have the right, subject to limitations that the underwriters may impose on the number of Shares included in the registration, to include the Shares held by them in the registration.

Form S-3 Registration Rights

At any time after the Issuer is qualified to file a registration statement on Form S-3 under the Securities Act, and subject to limitations and conditions specified in the Investors' Rights Agreement, holders of at least 20% of the registrable securities then outstanding may make a written request that the Issuer prepare and file a registration statement on Form S-3 covering their Shares, so long as the aggregate price to the public equal or exceeds $3 million. The Issuer is not obligated to effect more than two of these Form S-3 registrations in any 12-month period.

Support Agreement

In connection with the execution of the Merger Agreement, the Issuer and Pionyr entered into stockholder support agreements (the "Support Agreements") with certain stockholders of the Issuer, including OPI VI, Genesis, and WWH. The Support Agreements provide that, among other things, each of the stockholders has agreed to vote, or cause to be voted, at the Issuer's stockholders' meeting to be held in connection therewith all of the Shares owned by such stockholder in favor of (i) the approval of the conversion of the Series A Preferred Stock into Shares in accordance with Nasdaq Listing Rule 5635(a), and, if deemed necessary by the Issuer, (ii) the approval of an amendment to the certificate of incorporation of the Issuer to authorize sufficient Shares for the conversion of the Series A Preferred Stock issued pursuant to the Merger Agreement.

Contingent Value Rights Agreement

In connection with the Merger, the Issuer and the Rights Agent (as defined in the CVR Agreement (as defined below)) entered into a contingent value rights agreement (the "CVR Agreement"), pursuant to which stockholders of Pionyr as of immediately prior to the First Effective Time (as defined in the Merger Agreement), including OPI VI, shall be entitled to one contractual CVR issued by the Issuer, subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of Pionyr's common stock held by such stockholder immediately prior to the First Effective Time. Each CVR shall entitle the holder thereof to receive certain cash and/or stock payments from 50% of the net proceeds, if any, related to the disposition of Pionyr's legacy assets within two years following the Closing Date (as defined in the Merger Agreement). The CVRs are not transferable, except in certain limited circumstances as provided in the CVR Agreement, will not be certificated or evidenced by any instrument, and will not be registered with the SEC or listed for trading on any exchange.

The foregoing descriptions of the Investors' Rights Agreement, the Support Agreements, the Lock-Up Agreements, and the CVR Agreement do not purport to be complete and are qualified in their entirety by reference to the full text of the Investors' Rights Agreement, the Support Agreements, the Lock-Up Agreements, and the CVR Agreement, which are filed as Exhibit 2, Exhibit 3, Exhibit 4, and Exhibit 5 respectively, and are 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:** ORBIMED ADVISORS LLC

**Signature:** /s/ Carl L. Gordon

**Name/Title:** Carl L. Gordon, Member

**Date:** 06/18/2025

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:** ORBIMED CAPITAL GP VI LLC

**Signature:** /s/ Carl L. Gordon

**Name/Title:** Carl L. Gordon, Member of OrbiMed Advisors LLC

**Date:** 06/18/2025

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:** OrbiMed Genesis GP LLC

**Signature:** /s/ Carl L. Gordon

**Name/Title:** Carl L. Gordon, Member of OrbiMed Advisors LLC

**Date:** 06/18/2025

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:** ORBIMED CAPITAL LLC

**Signature:** /s/ Carl L. Gordon

**Name/Title:** Carl L. Gordon, Member

**Date:** 06/18/2025