Company: GNMSF
Filing Date: 2025-10-31
Form Type: SC TO-T/A
Source: 0001193125-25-259490
Chunk: 2

Company: GENMAB A/S
Filing Date: 2025-10-31
Form: SC TO-T/A
Chunk 2
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 TO remains unchanged and is incorporated herein by reference to the extent relevant to the items in this Amendment No. 1. This Amendment No. 1 should be read together with the Schedule TO.

| Item 4 | (Terms of the Transaction); Item 11 (Additional 
 Information).                                   |

The Offer to Purchase and Item 4 ( Terms of the Transaction) and Item 11 ( Additional Information) of the Schedule TO, to the extent such Item 4 ( Terms of the Transaction) or Item 11 ( Additional Information) incorporates by reference the information contained in the Offer to Purchase, are hereby amended and supplemented as follows: The information set forth in Section 17 — “ Certain Legal Matters; Regulatory Approvals” of the Offer to Purchase is hereby amended and supplemented by adding the following paragraph at the end of the subsection entitled “ United States Antitrust Laws”: On October 28, 2025, each of Purchaser and Merus filed Premerger Notification and Report Forms under the HSR Act with the FTC and the Antitrust Division in connection with Purchaser’s proposed acquisition of Common Shares pursuant to the Offer. As a result, the required fifteen (15) calendar-daywaiting period under the HSR Act with respect to the Offer will expire at 11:59 p.m., New York City time, on November 12, 2025, unless Purchaser withdraws its Premerger Notification and Report Forms before the expiration of the initial fifteen (15) calendar-daywaiting period and refiles it thereafter, or the FTC or the Antitrust Division shortens or extends the waiting period by granting Early Termination or issuing a Second Request, respectively, prior to expiry of the initial waiting period.

| Item 6 | (Purposes of the Transaction and Plans or Proposals); Item 11 
 (Additional Information).                                     |

The Offer to Purchase and Item 6 ( Purposes of the Transaction and Plans or Proposals) and Item 11 ( Additional Information) of the Schedule TO, to the extent such Item 6 ( Purposes of the Transaction and Plans or Proposals) or Item 11 ( Additional Information) incorporates by reference the information contained in the Offer to Purchase, are hereby amended and supplemented as follows: The information set forth in Section 13 — “ Purpose of the Offer; Back-EndTransactions; Plans for Merus” of the Offer to Purchase is hereby amended and supplemented by amending and restating the second paragraph under the subsection entitled “ Plans for Merus”