# EDGAR Filing Document

**Accession Number:** 0001888012
**File Stem:** 0001193125-25-206277
**Filing Date:** 2025-9
**Character Count:** 5961
**Document Hash:** 0823b785c83c579dcd4c9d6bd40caf50
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-206277.hdr.sgml**: 20250917

**ACCESSION NUMBER**: 0001193125-25-206277

**CONFORMED SUBMISSION TYPE**: S-8 POS

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250917

**DATE AS OF CHANGE**: 20250917

**EFFECTIVENESS DATE**: 20250917

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** HilleVax, Inc.
- **CENTRAL INDEX KEY:** 0001888012
- **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:** S-8 POS
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-264590
- **FILM NUMBER:** 251320525

**BUSINESS ADDRESS:**
- **STREET 1:** 321 HARRISON AVE, SUITE 500
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02118
- **BUSINESS PHONE:** (617) 213-5054

**MAIL ADDRESS:**
- **STREET 1:** 321 HARRISON AVE, SUITE 500
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02118

**As filed with the Securities and Exchange Commission on September 17, 2025** 

**Registration No. 333-264590** 

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**WASHINGTON, D.C. 20549** 

**POST-EFFECTIVE AMENDMENT NO. 1 TO** 

**FORM S-8 REGISTRATION STATEMENT** 

**(REGISTRATION NO. 333-264590)** 

***UNDER***

***THE SECURITIES ACT OF 1933***

## HILLEVAX, INC.
**(Exact name of registrant as specified in its charter)** 

---

| | |
|:---|:---|
| **Delaware** | **85-0545060** |
| **(State or other jurisdiction of<br>incorporation or organization)** | **(I.R.S. Employer<br>Identification No.)** |
| **321 Harrison Avenue<br>Boston, Massachusetts** | **02118** |
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

---

**HILLEVAX, INC. 2021 EQUITY INCENTIVE PLAN** 

**HILLEVAX, INC. 2022 INCENTIVE AWARD PLAN** 

**HILLEVAX, INC. 2022 EMPLOYEE STOCK PURCHASE PLAN** 

**(Full title of the plans)** 

**Robert Hershberg, M.D., Ph.D.** 

**Chairman, President and Chief Executive Officer** 

**HilleVax, Inc.** 

**321 Harrison Avenue** 

**Boston, Massachusetts 02118** 

**(Name and address of agent for service)** 

**(617) 213-5054** 

**(Telephone number, including area code, of agent for service)** 

***Copies to*:** 

**Matthew T. Bush** 

**Daniel E. Rees** 

**Cheston J. Larson** 

**Latham & Watkins LLP** 

**200 Clarendon Street** 

**Boston, Massachusetts 02116** 

**(617) 948-6000** 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

---

| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ☐ | Accelerated filer | ☐ |
| Non-accelerated filer | ☒ | Smaller reporting company | ☒ |
|  |  | 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 7(a)(2)(B) of the Securities Act. ☐

------

**DEREGISTRATION OF SECURITIES** 

This Post-Effective Amendment No. 1 relates to the following registration statement on Form S-8 filed with the Securities and Exchange Commission (the "SEC") by HilleVax, Inc., a Delaware corporation (the "Registrant"):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• registration statement on Form S-8 [(Registration No. 333-264590)](http://www.sec.gov/Archives/edgar/data/1888012/000119312522133995/d656388ds8.htm) filed with the SEC on April 29, 2022, pertaining to the registration of (i) 8,200,000 shares of the common stock of the Registrant, $0.0001 par value per share
(the "Common Stock"), reserved for issuance under the Registrant 2022 Incentive Award Plan, (ii) 200,039 shares of Common Stock subject to outstanding options under the Registrant 2021 Equity Incentive Plan, and (iii) 1,060,000
shares of Common Stock reserved for issuance under the Registrant 2022 Employee Stock Purchase Plan (the "Registration Statement").

On September 17, 2025, pursuant to the terms of an Agreement and Plan of Merger, dated as of August 4, 2025 (as it may be amended or supplemented, the "Merger Agreement"), by and among the Registrant, XOMA Royalty Corporation, a Nevada corporation ("Parent"), and XRA 4 Corp., a Delaware corporation and a wholly owned subsidiary of Parent ("Merger Sub"), Merger Sub merged with and into the Registrant, with the Registrant surviving the merger as a wholly owned subsidiary of Parent (the "Merger").

As a result of the Merger, the Registrant has terminated any and all offerings of its securities pursuant to the Registration Statement. In accordance with an undertaking made by the Registrant in the Registration Statement to remove from registration, by means of a post-effective amendment, any of the securities registered under the Registration Statement that remain unissued at the termination of the offerings, the Registrant hereby removes from registration all securities registered but unsold under such Registration Statement, if any, as of the date hereof.

------

**SIGNATURES** 

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all the requirements for filing on Form S-8 and has duly caused this Post-Effective Amendment No. 1 to the Registration Statement on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Wilmington, State of Delaware on September 17, 2025.

---

| | |
|:---|:---|
| **HILLEVAX, INC.** | **HILLEVAX, INC.** |
| By: | /s/ Owen Hughes |
|  | Owen Hughes |
|  | President, Treasurer and Secretary |

---