Company: GNMSF
Filing Date: 2025-12-09
Form Type: SC TO-T/A
Source: 0001193125-25-312750
Chunk: 2

Company: GENMAB A/S
Filing Date: 2025-12-09
Form: SC TO-T/A
Chunk 2
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 No. 2, the information set forth in the Schedule TO remains unchanged and is incorporated herein by reference to the extent relevant to the items in this Amendment No. 2. This Amendment No. 2 should be read together with the Schedule TO. Items 1 through 9; Item 11. The Offer to Purchase and Items 1 ( Summary Term Sheet) through 9 ( Persons/Assets Retained, Employed, Compensated or Used) and Item 11 ( Additional Information) of the Schedule TO, to the extent such Items incorporate by reference the information contained in the Offer to Purchase, are hereby amended and supplemented as follows:

| 1. | The information set forth in the section of the Offer to Purchase entitled “Summary Term                                                                                                    
 Sheet” under the heading “What is the Governance Resolutions Condition?” and the information set forth in Section 16 — “Conditions of the Offer” of the Offer to Purchase is hereby amended 
 and supplemented, in each case, by adding the following paragraph at the end thereof:                                                                                                       |

On December 9, 2025, Merus advised Genmab that, at the EGM held on December 9, 2025, Merus Shareholders adopted the Back-EndTransactions Resolutions, the Discharge Resolutions and the Governance Resolutions, among other things. Adoption of the Back-EndTransactions Resolutions and the Governance Resolutions at the EGM has satisfied the Governance Resolutions Condition. The Offer remains conditioned upon the satisfaction or waiver (to the extent such waiver is permitted by applicable law and the terms of the Transaction Agreement) of the other Offer Conditions, including the Minimum Condition. As the Article 14b Tax Ruling was obtained prior to the EGM, the proposal related to the Back-EndArticles Amendment and the Back-EndConversion and Amendment was deemed moot.

| 2. | The information set forth in the section of the Offer to Purchase entitled “Summary Term                                                                                                              
 Sheet” under the heading “What are the Legal Restraint Condition and the Antitrust Approvals Condition?”, the information set forth in Section 16 — “Conditions of the Offer” of the Offer to         
 Purchase, and the information set forth in Section 17 — “Certain Legal Matters; Regulatory Approvals” of the Offer to Purchase under the heading “United States Antitrust Laws” is hereby amended and 
 supplemented, in each case, by adding the following paragraph at the end thereof:                                                                                                                     |

The waiting period applicable to the Offer and