Major Shareholder Announcement

Company Announcement Major shareholder announcement for Genmab A/S COPENHAGEN, Denmark; April 1, 2026 – Genmab A/S (Nasdaq: GMAB) announces under reference to Section 30 of the Danish Capital Markets Act that Orbis Investment Management Limited has informed us that, as of March 31, 2026, Orbis Investment Management Limited through shares controlled the voting rights to 3,221,620 shares in Genmab A/S, which amounts to 5.01% of the share capital and voting rights in Genmab A/S.   The major shareholder announcement of Orbis Investment Management Limited is attached to this announcement.