NEWAMSTERDAM PHARMA COMPANY (NAMSW) Institutional Ownership Changes & 13F Activity
NEWAMSTERDAM PHARMA COMPANY (NAMSW). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q4 2025). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Ra Capital Management, L.P., Fcpm Iii Services B.V., Bain Capital Life Sciences Investors, Llc, Fmr Llc, and Wellington Management Group Llp.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Ensign Peak Advisors, Inc | Buy | +549,511 | — | 549,511 | $19.28M | Q4 2025 | Aug 18, 2026 |
| Strategic Wealth Partners, Ltd. | Buy | +325 | — | 325 | $11.40K | Q4 2025 | May 12, 2026 |
| Seven Fleet Capital Management Lp | Buy | +4,000 | — | 4,000 | $140.32K | Q4 2025 | Feb 26, 2026 |
| Sunbelt Securities, Inc. | Buy | +8 | — | 8 | $281.00 | Q4 2025 | Feb 20, 2026 |
| Ikarian Capital, Llc | Buy | +45,830 | — | 45,830 | $1.61M | Q4 2025 | Feb 18, 2026 |
| Ra Capital Management, L.P. | Buy | +9,550,191 | — | 9,550,191 | $335.02M | Q4 2025 | Feb 17, 2026 |
| Fcpm Iii Services B.V. | Buy | +9,198,900 | — | 9,198,900 | $322.70M | Q4 2025 | Feb 17, 2026 |
| Bain Capital Life Sciences Investors, Llc | Buy | +7,306,566 | — | 7,306,566 | $256.31M | Q4 2025 | Feb 17, 2026 |
| Fmr Llc | Buy | +6,412,984 | — | 6,412,984 | $224.97M | Q4 2025 | Feb 17, 2026 |
| Wellington Management Group Llp | Buy | +5,033,175 | — | 5,033,175 | $176.56M | Q4 2025 | Feb 17, 2026 |
| Deerfield Management Company, L.P. | Buy | +4,164,789 | — | 4,164,789 | $146.10M | Q4 2025 | Feb 17, 2026 |
| Polar Capital Holdings Plc | Buy | +2,776,222 | — | 2,776,222 | $97.39M | Q4 2025 | Feb 17, 2026 |
| Janus Henderson Group Plc | Buy | +2,341,723 | — | 2,341,723 | $82.30M | Q4 2025 | Feb 17, 2026 |
| Viking Global Investors | Sell | -2,271,967 | -35.1% | 4,203,567 | $147.46M | Q4 2025 | Feb 17, 2026 |
| Adage Capital Partners Gp, L.L.C. | Buy | +1,406,631 | — | 1,406,631 | $49.34M | Q4 2025 | Feb 17, 2026 |
| Alliancebernstein L.P. | Buy | +1,300,875 | — | 1,300,875 | $45.63M | Q4 2025 | Feb 17, 2026 |
| Duquesne Family Office Llc | Buy | +1,146,446 | +59.6% | 3,070,146 | $107.70M | Q4 2025 | Feb 17, 2026 |
| Castle Hook Partners Lp | Buy | +1,085,008 | — | 1,085,008 | $38.06M | Q4 2025 | Feb 17, 2026 |
| Cormorant Asset Management, Lp | Buy | +1,000,000 | — | 1,000,000 | $35.08M | Q4 2025 | Feb 17, 2026 |
| Woodline Partners Lp | Buy | +751,270 | — | 751,270 | $26.35M | Q4 2025 | Feb 17, 2026 |
| Citadel Advisors Llc | Buy | +635,247 | — | 635,247 | $22.28M | Q4 2025 | Feb 17, 2026 |
| Rock Springs Capital Management Lp | Buy | +557,194 | — | 557,194 | $19.55M | Q4 2025 | Feb 17, 2026 |
| Artia Global Partners Lp | Buy | +503,936 | — | 503,936 | $17.68M | Q4 2025 | Feb 17, 2026 |
| Bank Of America Corp | Buy | +459,391 | — | 459,391 | $16.12M | Q4 2025 | Feb 17, 2026 |
| Logos Global Management Lp | Buy | +450,000 | — | 450,000 | $15.79M | Q4 2025 | Feb 17, 2026 |
| Eversept Partners, Lp | Buy | +420,827 | — | 420,827 | $14.76M | Q4 2025 | Feb 17, 2026 |
| Slate Path Capital Lp | Buy | +319,000 | — | 319,000 | $11.19M | Q4 2025 | Feb 17, 2026 |
| Arrowmark Colorado Holdings Llc | Buy | +298,077 | — | 298,077 | $10.46M | Q4 2025 | Feb 17, 2026 |
| Millennium Management Llc | Buy | +254,596 | — | 254,596 | $8.93M | Q4 2025 | Feb 17, 2026 |
| Gilder Gagnon Howe & Co Llc | Buy | +248,528 | — | 248,528 | $8.72M | Q4 2025 | Feb 17, 2026 |
Frequently asked questions about NAMSW activity
Which institutional owners are buying NAMSW?
Institutional owners buying NAMSW include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in NAMSW activity?
"Buy" means an investor increased their reported position in NAMSW compared to the prior reporting period. This reflects growing exposure to NEWAMSTERDAM PHARMA COMPANY (NAMSW) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in NAMSW increasing?
Institutional interest in NAMSW can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.