SCHEDULE 13D

MERUS N V

Common Shares, Euro 0.09 nominal value per share · CUSIP: N5749R100

Event date: 2025-12-12

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Genmab A/SReported CIK 0001434265

  Shares: 71,946,801 · Class: 94.8%

• Genmab Holding II B.V.

  Shares: 71,946,801 · Class: 94.8%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.