14 institutions reported holding $45.9M of NEWAMSTERDAM PHARMA COMPANY (NAMSW) in SEC 13F filings for 2026-06-30. Largest institutional holders: Ikarian Capital, LLC ($13.6M), Frazier Life Sciences Management, L.P. ($10.7M), RA CAPITAL MANAGEMENT, L.P. ($7.1M), Affinity Asset Advisors, LLC ($5.3M), Bain Capital Life Sciences Investors, LLC ($2.1M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Ikarian Capital, LLC | $13.6M | 400,000 | New |
| 2 | Frazier Life Sciences Management, L.P. | $10.7M | 500,333 | Hold |
| 3 | RA CAPITAL MANAGEMENT, L.P. | $7.1M | 333,333 | Hold |
| 4 | Affinity Asset Advisors, LLC | $5.3M | 245,000 | Hold |
| 5 | Bain Capital Life Sciences Investors, LLC | $2.1M | 99,999 | Hold |
| 6 | DEERFIELD MANAGEMENT COMPANY, L.P. | $2.0M | 92,787 | Hold |
| 7 | MILLENNIUM MANAGEMENT LLC | $1.6M | 75,000 | Hold |
| 8 | SIMPLEX TRADING, LLC | $1.5M | 45,400 | Trimmed |
| 9 | IMC-Chicago, LLC | $1.1M | 32,700 | Added |
| 10 | ARISTEIA CAPITAL, L.L.C. | $343,377 | 15,708 | Hold |
| 11 | WOLVERINE ASSET MANAGEMENT LLC | $318,947 | 14,925 | Added |
| 12 | Vestcor Inc | $143,000 | 6,666 | Hold |
| 13 | GROUP ONE TRADING LLC | $16,945 | 500 | Hold |
| 14 | UBS Group AG | $8,523 | 443 | Added |
Source: SEC Form 13F filings · as of 2026-06-30