SCHEDULE 13D/A

NEWAMSTERDAM PHARMA COMPANY

Ordinary Shares, nominal value Euro 0.12 per share · CUSIP: N62509109

Event date: 2025-12-02

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

• BCLS Fund III Investments, LPReported CIK 0001952107

  Shares: 5,376,356 · Class: 4.7%

• Bain Capital Life Sciences Opportunities III, LPReported CIK 0001950105

  Shares: 1,257,141 · Class: 1.1%

• Bain Capital Life Sciences Fund II, L.P.Reported CIK 0001773187

  Shares: 89,142 · Class: 0.1%

• BCLS II Investco, LPReported CIK 0001818893

  Shares: 297,557 · Class: 0.3%

• BCLS II Equity Opportunities, LPReported CIK 0001814474

  Shares: 375,512 · Class: 0.3%

• BCIP Life Sciences Associates, LPReported CIK 0001702921

  Shares: 10,857 · Class: 0.01%

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