Company: XOMAP
Filing Date: 2025-08-11
Form Type: SC TO-T/A
Source: 0001193125-25-177546
Chunk: 2

Company: XOMA Royalty Corp
Filing Date: 2025-08-11
Form: SC TO-T/A
Chunk 2
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.m. Eastern Time on August 7, 2025 (the “”) and
was not extended. The Depositary and Paying Agent has advised Purchaser that, as of the Expiration Date, a total of 17,192,002 Shares were validly tendered into, and not validly withdrawn from, the Offer, representing approximately 74% of Shares
that were issued and outstanding as of the Expiration Date. All conditions to the Offer, including the Minimum Tender Condition, having been satisfied or waived, Purchaser irrevocably accepted for payment, and made payment for all Shares validly
tendered and not validly withdrawn in the Offer.

On August 11, 2025, Purchaser completed the acquisition of Turnstone pursuant to
the terms of the Merger Agreement through the merger of Merger Sub with and into Turnstone in accordance with Section 251(h) of the DGCL, with Turnstone continuing as the surviving corporation in the Merger and thereby becoming a wholly owned
subsidiary of Purchaser. At the Effective Time, each issued and outstanding Share not tendered into the Offer (other than any Excluded Shares or Dissenting Shares) was automatically converted into the right to receive the Offer Price.

The Shares ceased to trade on Nasdaq prior to the commencement of trading on August 11, 2025, and Turnstone has requested that Nasdaq
file a Notification of Removal from Listing and/or Registration under Section 12(b) of the Exchange Act on Form 25 to delist and deregister the Shares. Purchaser and Turnstone 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 Turnstone’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 Purchaser issued on August 11, 2025. |

| * | Filed herewith. |

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SIGNATURE After due inquiry and