SCHEDULE 13G/A

MERUS N V

Common Shares, nominal value (euro) 0.09 per share · CUSIP: N5749R100

Event date: 2025-09-30

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

• RTW Investments, LP

  Shares: 2,025,277.00 · Class: 2.7%

• Roderick Wong

  Shares: 2,025,277.00 · Class: 2.7%

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