# EDGAR Filing Document

**Accession Number:** 0001544227
**File Stem:** 0001193125-26-257684
**Filing Date:** 2026-6
**Character Count:** 21431
**Document Hash:** 783676a2d67948d20cbb67abce88e0c9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-257684.hdr.sgml**: 20260604

**ACCESSION NUMBER**: 0001193125-26-257684

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20260529

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260604

**DATE AS OF CHANGE**: 20260604

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Tempest Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001544227
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 451472564
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35890
- **FILM NUMBER:** 261065830

**BUSINESS ADDRESS:**
- **STREET 1:** 2000 SIERRA POINT PARKWAY
- **STREET 2:** SUITE 400
- **CITY:** BRISBANE
- **STATE:** CA
- **ZIP:** 94005
- **BUSINESS PHONE:** 415-798-8589

**MAIL ADDRESS:**
- **STREET 1:** 2000 SIERRA POINT PARKWAY
- **STREET 2:** SUITE 400
- **CITY:** BRISBANE
- **STATE:** CA
- **ZIP:** 94005

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Millendo Therapeutics, Inc.
- **DATE OF NAME CHANGE:** 20181207

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** OvaScience, Inc.
- **DATE OF NAME CHANGE:** 20120308

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

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): May 29, 2026

## Tempest Therapeutics, Inc.

#### (Exact name of Registrant as Specified in Its Charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-35890** | **45-1472564** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **2000 Sierra Point Parkway, Suite 400** |  |
| **Brisbane, California** | **94005** |
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

---

#### Registrant's Telephone Number, Including Area Code: (415) 798-8589

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

---

| | | |
|:---|:---|:---|
| **<br>Title of each class** | **Trading**<br> **Symbol(s)** | **Name of each exchange**<br> **on which registered** |
| Common Stock, $0.001 par value | TPST | The Nasdaq Stock Market LLC |
| Series A Junior Participating Preferred Purchase Rights | N/A | The Nasdaq Stock Market LLC |

---

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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
*Departure of Chief Financial Officer and Principal Financial Officer* 

On May 29, 2026, Mr. Nicholas Maestas notified Tempest Therapeutics, Inc. (the "Company") of his decision to resign from his position as Chief Financial Officer of the Company and from any and all other positions he holds with the Company, effective as of June 5, 2026.

*Appointment of Principal Financial Officer* 

Effective June 5, 2026, the Board of Directors of the Company (the "Board") appointed Mr. Justin Trojanowski as Vice President, Finance, Principal Financial Officer and Corporate Secretary of the Company, in addition to his current role as Corporate Controller, Treasurer and Principal Accounting Officer of the Company.

Mr. Trojanowski, 37, has served as the Company's Corporate Controller, Treasurer and Principal Accounting Officer since September 2022. Previously, Mr. Trojanowski has served as Director, Finance and Assistant Controller from June 2022 through September 2022. Prior to joining the Company, Mr. Trojanowski served as Associate Director, Accounting at Nektar Therapeutics, a biopharmaceutical company, from June 2019 to June 2022. Prior to Nektar, Mr. Trojanowski served as Senior Manager, Accounting at Immune Design, a late-stage oncology company that was acquired by Merck in 2019, from June 2018 to May 2019. Prior to Immune Design, Mr. Trojanowski worked at Ernst & Young, Global Limited, a multinational audit and professional services company, from September 2012 to May 2018, most recently as an Assurance Manager. Mr. Trojanowski received his B.S. in Accountancy from Providence College and an M.B.A. in Accountancy from Providence College, and is a Certified Public Accountant.

Mr. Trojanowski has entered into the Company's standard form of indemnification agreement, the form of which was previously filed by the Company. A copy of Mr. Trojanowski's employment agreement will be filed as an exhibit to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2026.

There are no family relationships between Mr. Trojanowski and any of the Company's directors or executive officers, and there are no arrangements or understandings between Mr. Trojanowski and any other person pursuant to which he was appointed as an officer of the Company. There are no transactions involving Mr. Trojanowski requiring disclosure under Item 404(a) of Regulation S-K.

*Appointment of Directors* 

Effective June 4, 2026, the Board appointed Dr. John David Yee and Mr. William Drake Richey as Class II directors to fill vacancies on the Board. Dr. Yee and Mr. Richey will each serve until the Company's 2026 annual meeting of stockholders and until his successor is duly elected and qualified, or until his earlier death, resignation or removal. Dr. Yee and Mr. Richey have each been appointed to serve on the Audit Committee, the Compensation Committee and the Nominating and Corporate Governance Committee.

Dr. Yee, MD, MPH, 63, currently serves as Senior Vice President, Medical Affairs at Apnimed, Inc. and has more than 25 years of leadership experience at biotechnology, pharmaceutical and health care technology companies and at a major academic medical center. Prior to joining Apnimed in September 2023, Dr. Yee served as Chief Medical Officer at Sobi North America from 2020 to 2023, and previously held senior medical leadership roles at Genzyme Corporation, AstraZeneca Pharmaceuticals, Intarcia Therapeutics, Inc., Vertex Pharmaceuticals, Inc. (Nasdaq: VRTX) and Flexion Therapeutics, Inc. Dr. Yee previously served as an independent director on the board of Comera Life Sciences from 2021 to 2023. Dr. Yee earned an M.D. from Harvard Medical School, an M.P.H. in Health Care Management from the Harvard T.H. Chan School of Public Health and an A.B. from Harvard College. The Company believes Dr. Yee's extensive biopharmaceutical and medical affairs experience qualifies him to serve on the Board.

Mr. Richey, 43, serves as President of Bush & Company, a financial advisory firm that advises high-net-worth families and business owners on investment strategy, risk management, and multi-generational planning. Mr. Richey previously served as President of Life Check, an independent insurance policy review firm serving investment fiduciaries, professional trustees, and trusted advisors, as Vice President, Portfolio Manager at Wells Fargo, and as Director at Fitch Ratings. Mr. Richey is a founding member of the Boston Chapter of the Exit Planning Institute and has served on the boards of DEAF Inc., International Fellowship House, and Park Street Church. Mr. Richey earned a Bachelor of Science degree from Trinity College. The Company believes Mr. Richey's financial and strategic experience qualifies him to serve on the Board.

------

The Company's non-employee directors will be compensated in accordance with the Company's Non-Employee Director Compensation Policy, as amended on June 4, 2026 (the "Amended Compensation Policy"). Pursuant to the Amended Compensation Policy, each of Dr. Yee and Mr. Richey will receive compensation in connection with his service as a non-employee director, including an initial option award to purchase 25,000 shares of the Company's common stock under the Company's 2023 Equity Incentive Plan ("Plan"), subject to the terms and conditions of the applicable award agreement and the Compensation Policy. Each of Dr. Yee and Mr. Richey has entered into the Company's standard form of indemnification agreement, the form of which was previously filed by the Company. The Amended Compensation Policy is substantially consistent with the terms described under "Director Compensation" in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2025, except that it provides for the following reduced annual cash retainers: a base retainer of $20,000 for service on the Board, an additional $17,500 for service as non-executive Chair of the Board, committee chair retainers of $10,000 for the Audit Committee, $7,500 for the Compensation Committee, $5,000 for the Nominating and Corporate Governance Committee and $6,000 for the Science and Technology Committee, and committee member retainers of $5,000 for the Audit Committee, $3,750 for the Compensation Committee, $2,500 for the Nominating and Corporate Governance Committee and $3,000 for the Science and Technology Committee.

The foregoing description of the Compensation Policy does not purport to be complete and is qualified by reference to the full text of the Amended Compensation Policy, a copy of which will be filed as exhibits to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2026.

There are no arrangements or understandings between either Dr. Yee or Mr. Richey and any other person pursuant to which either was appointed as a director of the Company, there are no family relationships between either Dr. Yee or Mr. Richey and any of the Company's directors or executive officers, and there are no transactions involving either Dr. Yee or Mr. Richey requiring disclosure under Item 404(a) of Regulation S-K. Previously, on May 22, 2026, Nasdaq had notified the Company that, as a result of resignations from the Board, the Company was no longer in compliance with the Nasdaq Listing Rules due to more than one vacancy on its Board and board committees. As a result, Nasdaq advised the Company that it was not eligible for the cure periods set forth in Nasdaq Listing Rules 5605(b)(1)(A) and 5605(c)(4) and that the Company is required to submit a plan of compliance within the timeframe prescribed by Nasdaq.

Following receipt of the Nasdaq notification, the Board has taken steps to address the identified deficiencies. In connection with the appointments of Dr. Yee and Mr. Richey described above, the Board has begun to reconstitute its membership and committees as part of its efforts to regain compliance with the applicable Nasdaq Listing Rules, and believes it has only one remaining vacancy to fill before becoming eligible for the cure period provided in Nasdaq's Listing Rules 5605(b)(1)(A) and 5605(c)(4). The Company further believes it has regained compliance with Nasdaq Listing Rule 5605(d)(2)(A) and intends to appoint an additional independent director to complete the reconstitution of the Audit Committee and restore full compliance with the applicable Nasdaq requirements.

---

| | |
|:---|:---|
| **Item 7.01.** | **Regulation FD Disclosure.**  |

---

On June 4, 2026, the Company issued a press release entitled "Tempest Therapeutics Appoints Drake Richey and John Yee, MD, MPH to Board of Directors." A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information furnished in this Item 7.01 (including Exhibit 99.1) shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act or the Exchange Act, except as expressly provided by specific reference in such a filing.

---

| | |
|:---|:---|
| **Item 9.01.** | **Financial Statements and Exhibits.**  |

---

(d) Exhibits.

---

| | |
|:---|:---|
| **Number** | **Description** |
| 99.1 | [Press Release, dated June 4, 2026, furnished herewith.](d91703dex991.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

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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.

---

| | | |
|:---|:---|:---|
|  |  | **TEMPEST THERAPEUTICS, INC.** |
| Date: June 4, 2026 | By: | /s/ Matthew Angel |
|  | Name: | Matthew Angel |
|  | Title: | President and Chief Executive Officer |

---

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g91703g0604125818927.jpg)

**Tempest Therapeutics Appoints Drake Richey and John Yee, MD, MPH to Board of Directors** 

**Brisbane, CA**, June 4, 2026 **–** Tempest Therapeutics, Inc. (Nasdaq: TPST) ("Tempest" or "Tempest Therapeutics") today announced the appointment of two independent directors, Drake Richey and John Yee, MD, MPH to its Board of Directors (the "Board"), effective June 4, 2026. Mr. Richey and Dr. Yee collectively bring decades of experience in corporate finance and therapeutic product development to the Board.

"Over the past several months, we have built a portfolio of CAR-T cell therapy product candidates targeting safe, effective treatments for patients with advanced cancers," said Matt Angel, Ph.D., President and CEO of Tempest. "The addition of Drake and John to the Board could further enable us to realize our vision of providing meaningful treatment options to cancer patients that have either failed or relapsed from prior therapies, while supporting Tempest's focus on driving growth and disciplined capital allocation. I look forward to Drake's and John's insights as we continue to position the Company for long-term success."

**About Drake Richey** 

Drake Richey serves as President of Bush & Company, a financial advisory firm that advises high-net-worth families and business owners on investment strategy, risk management, and multi-generational planning. Mr. Richey previously served as President of Life Check, an independent insurance policy review firm serving investment fiduciaries, professional trustees, and trusted advisors, as Vice President, Portfolio Manager at Wells Fargo, and as Director at Fitch Ratings. Mr. Richey is a founding member of the Boston Chapter of the Exit Planning Institute and has served on the boards of DEAF Inc., International Fellowship House, and Park Street Church. Mr. Richey earned a Bachelor of Science degree from Trinity College.

------

**About John Yee, MD, MPH** 

John Yee MD, MPH, is Senior Vice President, Medical Affairs at Apnimed. Dr. Yee previously served as Chief Medical Officer at Sobi North America, Senior Vice President, Medical Affairs at Flexion Therapeutics, Inc., Senior Vice President and Global Head of Medical Affairs at Vertex Pharmaceuticals, Inc., Vice President, Medical Affairs, Safety and Operations at Intarcia Therapeutics, Inc., and Vice President, US Head Medical Officer and Vice President and Head of Medical Affairs for the US Diabetes franchise at AstraZeneca Pharmaceuticals, and in various medical leadership roles at Genzyme Corporation, including Vice President, US Medical Affairs, Vice President, Global Medical Affairs, and Vice President, Global Head, Evidence-Based Medicine and Health Outcomes Research. Dr. Yee earned his MD at Harvard Medical School and MPH in Health Care Management from the Harvard T.H. Chan School of Public Health. Dr. Yee previously held leadership roles at Boston Children's Hospital and served as a faculty member at Harvard Medical School. Dr. Yee previously served as an independent director on the board of Comera Life Sciences.

**About Tempest Therapeutics** 

Tempest Therapeutics is a clinical-stage biotechnology company developing a pipeline of advanced CAR-T cell therapy product candidates to treat cancer. Tempest is headquartered in Brisbane, California. More information about Tempest can be found on the company's website at https://www.tempesttx.com.

**Forward-Looking Statements** 

This press release contains forward-looking statements (including within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended, concerning Tempest Therapeutics. These statements may discuss goals, intentions, and expectations as to future plans, trends, events, results of operations or financial condition, or otherwise, based on current beliefs of the management of Tempest Therapeutics, as well as assumptions made by, and information currently available to, management of Tempest Therapeutics. Forward-looking statements generally include statements that are predictive in nature and depend upon or refer to future events or conditions, and include words such as "may," "will," "should," "would," "could", "expect," "anticipate," "plan," "likely," "believe," "estimate," "project," "intend," "goal", "suggest", "target" and other similar expressions. All statements that are not historical facts are forward-looking statements, including but not limited to, statements regarding: the anticipated contributions of the newly appointed directors; the strategic growth, capital allocation and long-term success of Tempest Therapeutics; and Tempest Therapeutics' ability to achieve its operational plans. All forward-looking statements in this press release are based on Tempest Therapeutics' current expectations, estimates and projections about its industry as well as management's current beliefs and expectations of future events only as of today and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. These

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risks and uncertainties include, but are not limited to Tempest Therapeutics' need for additional capital to fund its planned programs and operations and to continue to operate as a going concern; unexpected safety or efficacy data observed during preclinical or clinical trials; the possibility that results from prior clinical trials and preclinical studies may not necessarily be predictive of future results; past results may not be indicative of future results; clinical trial site activation or enrollment rates that are lower than expected; loss of key personnel; changes in expected or existing competition; changes in the regulatory environment; risks relating to volatility and uncertainty in the capital markets for biotechnology companies; and unexpected litigation or other disputes. These and other factors that may cause actual results to differ from those expressed or implied are discussed in greater detail in the "Risk Factors" section of Tempest Therapeutics' Annual Report on Form 10-K for the year ended December 31, 2025, filed with the Securities and Exchange Commission ("SEC") on March 30, 2026, and in other documents filed by Tempest Therapeutics from time to time with the SEC. Except as required by applicable law, Tempest Therapeutics undertakes no obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise. These forward-looking statements should not be relied upon as representing Tempest Therapeutics' views as of any date subsequent to the date of this press release and should not be relied upon as prediction of future events. In light of the foregoing, investors are urged not to rely on any forward-looking statement in reaching any conclusion or making any investment decision about any securities of Tempest Therapeutics.

**Investor Contacts:** 

Sylvia Wheeler

Wheelhouse Life Science Advisors

<u>swheeler@wheelhouselsa.com</u> 

Aljanae Reynolds

Wheelhouse Life Science Advisors

<u>areynolds@wheelhouselsa.com</u>