NEWAMSTERDAM PHARMA COMPANY (NAMSW) Institutional Shareholders
NEWAMSTERDAM PHARMA COMPANY (NAMSW) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $4.09B in NAMSW holdings during the latest filing period.
Frazier Life Sciences Management, L.P. is currently the largest disclosed institutional shareholder of NAMSW tracked by InsiderSet, reporting ownership valued at approximately $613.03M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $207.84M, representing an estimated loss of -66.10% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 64% of the total disclosed NAMSW value among the investors covered in this analysis. Major shareholders include Frazier Life Sciences Management, L.P., Capital World Investors, Fmr Llc, and several other long-term asset managers with concentrated positions in NEWAMSTERDAM PHARMA COMPANY (NAMSW).
This page ranks the largest institutional NAMSW shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
190
Total Reported Value
$4.09B
Largest Holder
Frazier Life Sciences Management, L.P.
Largest Position
$613.03M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
63
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Frazier Life Sciences Management, L.P. | 13.35% | 18,088,902 | $613,032,889 | $207,841,484 | -$405,191,405 | -66.10% | |
| Capital World Investors | 0.05% | 12,230,557 | $414,493,577 | $140,529,100 | -$273,964,477 | -66.10% | |
| Fmr Llc | 0.02% | 10,339,663 | $350,411,179 | $118,802,728 | -$231,608,451 | -66.10% | |
| Ra Capital Management, L.P. | 2.81% | 9,550,191 | $323,655,973 | $109,731,695 | -$213,924,278 | -66.10% | |
| Fcpm Iii Services B.V. | 38.34% | 8,490,353 | $287,738,063 | $97,554,156 | -$190,183,907 | -66.10% | |
| Deerfield Management Company, L.P. | 1.51% | 4,264,789 | $144,533,699 | $49,002,426 | -$95,531,273 | -66.10% | |
| Viking Global Investors | Ole Andreas Halvorsen | 0.41% | 4,203,567 | $142,458,886 | $48,298,985 | -$94,159,901 | -66.10% |
| Bain Capital Life Sciences Investors, Llc | 7.67% | 3,806,566 | $129,004,522 | $43,737,443 | -$85,267,079 | -66.10% | |
| Maverick Capital Ltd | 1.00% | 3,267,802 | $110,745,810 | $37,547,045 | -$73,198,765 | -66.10% | |
| Duquesne Family Office Llc | Stanley Druckenmiller | 2.39% | 3,070,146 | $104,047,000 | $35,275,978 | -$68,771,022 | -66.10% |
| Medicxi Ventures Management (Jersey) Ltd | 42.19% | 2,208,639 | $74,850,776 | $25,377,262 | -$49,473,514 | -66.10% | |
| Janus Henderson Group Plc | 0.04% | 2,258,984 | $72,253,603 | $25,955,726 | -$46,297,877 | -64.08% | |
| Jennison Associates Llc | 0.04% | 2,102,286 | $71,246,471 | $24,155,266 | -$47,091,205 | -66.10% | |
| Orbis Allan Gray Ltd | 0.20% | 1,747,627 | $59,227,079 | $20,080,234 | -$39,146,845 | -66.10% | |
| Polar Capital Holdings Plc | 0.17% | 1,724,518 | $58,443,915 | $19,814,712 | -$38,629,203 | -66.10% | |
| Capital International Investors | 0.01% | 1,723,495 | $58,409,246 | $19,802,958 | -$38,606,288 | -66.10% | |
| Goldman Sachs Group Inc | 0.01% | 1,544,911 | $52,357,034 | $17,751,027 | -$34,606,007 | -66.10% | |
| Westfield Capital Management Co Lp | 0.17% | 1,536,472 | $52,071,036 | $17,654,063 | -$34,416,973 | -66.10% | |
| Castle Hook Partners Lp | 0.50% | 1,371,005 | $46,463,359 | $15,752,847 | -$30,710,512 | -66.10% | |
| Ameriprise Financial Inc | 0.01% | 1,253,549 | $42,482,886 | $14,403,278 | -$28,079,608 | -66.10% | |
| Alliancebernstein L.P. | 0.01% | 1,259,940 | $40,330,679 | $14,476,711 | -$25,853,968 | -64.10% | |
| Price T Rowe Associates Inc | 0.00% | 1,167,357 | $39,562,000 | $13,412,932 | -$26,149,068 | -66.10% | |
| Jpmorgan Chase & Co | 0.00% | 1,132,955 | $38,373,185 | $13,017,653 | -$25,355,532 | -66.08% | |
| Aberdeen Group Plc | 0.05% | 1,102,785 | $37,373,384 | $12,671,000 | -$24,702,384 | -66.10% | |
| Blackrock, Inc. | 0.00% | 1,063,750 | $36,050,487 | $12,222,488 | -$23,828,000 | -66.10% | |
| Timessquare Capital Management, Llc | 0.40% | 796,162 | $26,981,930 | $9,147,901 | -$17,834,029 | -66.10% | |
| Bnp Paribas Asset Management Holding S.A. | 0.03% | 781,140 | $26,472,835 | $8,975,299 | -$17,497,536 | -66.10% | |
| Susquehanna International Group, Llp | 0.02% | 754,327 | $25,564,142 | $8,667,217 | -$16,896,925 | -66.10% | |
| Woodline Partners Lp | 0.08% | 752,489 | $25,501,852 | $8,646,099 | -$16,855,753 | -66.10% | |
| Bank Of America Corp | 0.00% | 735,483 | $24,925,518 | $8,450,700 | -$16,474,818 | -66.10% | |
| Nwi Management Lp | 1.52% | 702,000 | $23,791,000 | $8,065,980 | -$15,725,020 | -66.10% | |
| American Century Companies Inc | 0.01% | 684,813 | $23,208,343 | $7,868,501 | -$15,339,842 | -66.10% | |
| Citadel Advisors Llc | 0.01% | 645,805 | $21,886,331 | $7,420,299 | -$14,466,032 | -66.10% | |
| Rock Springs Capital Management Lp | 0.96% | 582,744 | $19,749,194 | $6,695,729 | -$13,053,465 | -66.10% | |
| First Turn Management, Llc | 2.11% | 582,497 | $19,740,823 | $6,692,891 | -$13,047,932 | -66.10% | |
| Morgan Stanley | 0.00% | 575,825 | $19,514,724 | $6,616,229 | -$12,898,495 | -66.10% | |
| Adage Capital Partners Gp, L.L.C. | 0.03% | 550,000 | $18,639,500 | $6,319,500 | -$12,320,000 | -66.10% | |
| Artia Global Partners Lp | 3.25% | 503,936 | $17,078,391 | $5,790,225 | -$11,288,166 | -66.10% | |
| Millennium Management Llc | 0.01% | 501,614 | $16,999,698 | $5,763,545 | -$11,236,153 | -66.10% | |
| Cormorant Asset Management, Lp | 0.87% | 500,000 | $16,945,000 | $5,745,000 | -$11,200,000 | -66.10% | |
| Jane Street Group, Llc | 0.01% | 474,236 | $16,071,858 | $5,448,972 | -$10,622,886 | -66.10% | |
| Kennedy Capital Management Llc | 0.25% | 421,374 | $14,280,365 | $4,841,587 | -$9,438,778 | -66.10% | |
| Bank Of New York Mellon Corp | 0.00% | 353,298 | $11,973,270 | $4,059,394 | -$7,913,876 | -66.10% | |
| Hrt Financial Lp | 0.02% | 349,843 | $11,856,000 | $4,019,696 | -$7,836,304 | -66.10% | |
| Ubs Group Ag | 0.00% | 344,065 | $11,660,363 | $3,953,307 | -$7,707,056 | -66.10% | |
| Slate Path Capital Lp | 0.15% | 319,000 | $10,810,910 | $3,665,310 | -$7,145,600 | -66.10% | |
| Lord, Abbett & Co. Llc | 0.03% | 306,560 | $10,389,000 | $3,522,374 | -$6,866,626 | -66.10% | |
| Exoduspoint Capital Management, Lp | 0.10% | 304,334 | $10,313,879 | $3,496,798 | -$6,817,081 | -66.10% | |
| Eversept Partners, Lp | 0.51% | 275,471 | $9,335,712 | $3,165,162 | -$6,170,550 | -66.10% | |
| Affinity Asset Advisors, Llc | 0.46% | 275,000 | $9,319,750 | $3,159,750 | -$6,160,000 | -66.10% |
Frequently asked questions about NAMSW
Who owns the most NAMSW stock?
The largest holders of NAMSW are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for NEWAMSTERDAM PHARMA COMPANY (NAMSW).
Is NAMSW widely held by superinvestors?
Many widely followed stocks like NAMSW appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly NAMSW is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.