Genmab A/S announced December 3, 2025that it and its wholly owned subsidiary Genmab Finance LLC (?Genmab Finance?) have closed their previously announced offering of $1.5 billion of 6.250% senior secured notes due 2032 (the ?Secured Notes?) and $1.0 billion of 7.250% senior unsecured notes due 2033 (the ?Unsecured Notes,? and together with the Secured Notes, the ?Notes?). Genmab intends to use the net proceeds from this offering of the Notes, together with borrowings under the new $2.0 billion senior secured term loan ?B? facility, the $1.0 billion senior secured term loan ?A? facility and the $500 million senior secured revolving credit facility (collectively, the ?New Credit Facilities?) and cash on hand, to fund the consideration payable in connection with the pending acquisition (the ?Acquisition?) of Merus N.V. (?Merus?) and related fees and expenses in connection with the Acquisition, the borrowings under the New Credit Facilities and the issuance of the Notes.

Prior to the Acquisition closing, the Notes and the related guarantees from Genmab subsidiaries will be secured solely by segregated accounts of Genmab in which the gross proceeds of the Notes will be held. Following the purchase of all Merus common shares tendered in the previously announced tender offer by Genmab, the Secured Notes will be secured by a first priority security interest in certain assets of Genmab and its subsidiaries that will guarantee the obligations under the New Credit Facilities, in accordance with certain customary practices in the relevant jurisdictions, and subject to certain thresholds, exceptions and permitted liens. The Secured Notes are unconditionally guaranteed on a senior secured basis and the Unsecured Notes are unconditionally guaranteed on a senior unsecured basis by certain subsidiaries of Genmab that will guarantee the obligations under the New Credit Facilities.

The indentures governing the Notes contain customary covenants that, among other things, restrict, with certain exceptions, the ability of each of Genmab and its subsidiaries to incur additional debt, pay dividends, make certain other restricted payments, incur debt secured by liens, dispose of assets, engage in consolidations and mergers or sell or transfer all or substantially all of its assets. The Notes have not been, and will not be, registered under the Securities Act of 1933, as amended (the ?Securities Act?), or any state or other securities laws and may not be offered or sold in the United States absent an effective registration statement or an applicable exemption from the registration requirements of or in a transaction not subject to the Securities Act and any state or other applicable securities laws. Accordingly, the Notes were offered and sold only to persons who were (1) reasonably believed to be ?qualified institutional buyers?

as defined in Rule 144A under the Securities Act or (2) non-U.S. persons outside the United States pursuant to Regulation S under the Securities Act. The Notes are subject to restrictions on transferability and resale and may not be transferred or resold except in compliance with the registration requirements of the Securities Act or pursuant to an exemption therefrom and in compliance with any state or other applicable securities laws.