Company: XOMAP
Filing Date: 2025-09-17
Form Type: SC TO-T/A
Source: 0001193125-25-205563
Chunk: 3

Company: XOMA Royalty Corp
Filing Date: 2025-09-17
Form: SC TO-T/A
Chunk 3
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 and deregister the Shares. Purchasers and HilleVax intend to file a certification and notice of termination of registration on
Form 15 with the SEC requesting the termination of registration of the Shares under Section 12(g) of the Exchange Act and the suspension of reporting obligations under Section 13 and 15(d) of the Exchange Act with respect to the Shares and
take steps to cause the termination of the registration of the Shares under the Exchange Act and suspend all of HilleVax’s reporting obligations under the Exchange Act as promptly as practicable.”

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ITEM 12. EXHIBITS. Item 12 of the Schedule TO is hereby amended and supplemented by adding the following Exhibit to the list of Exhibits:

| Index No.  |     |                                                           |
| (a)(5)(B)* |     | Press Release of Purchasers issued on September 17, 2025. |

| * | Filed herewith. |

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SIGNATURE After due 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. Dated: September 17, 2025

| XRA 4 Corp.                               |
| /s/ Owen Hughes                           |
| Name: Owen Hughes                         |
| Title: President, Treasurer and Secretary |
| XOMA Royalty Corporation                  |
| /s/ Owen Hughes                           |
| Name: Owen Hughes                         |
| Title: Chief Executive Officer            |

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