NAMSW Institutional Ownership & Shareholders
NEWAMSTERDAM PHARMA COMPANY (NAMSW) is currently held by 189 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $4.06B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
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 $162.52M, representing an estimated loss of -73.49% 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
189
Total Reported Value
$4.06B
Largest Holder
Frazier Life Sciences Management, L.P.
Largest Position
$613.03M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
60
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 | $162,519,740 | -$450,513,149 | -73.49% | |
| Capital World Investors | 0.05% | 12,230,557 | $414,493,577 | $109,885,439 | -$304,608,138 | -73.49% | |
| Fmr Llc | 0.02% | 10,339,663 | $350,411,179 | $92,896,702 | -$257,514,477 | -73.49% | |
| Ra Capital Management, L.P. | 2.81% | 9,550,191 | $323,655,973 | $85,803,691 | -$237,852,282 | -73.49% | |
| Fcpm Iii Services B.V. | 38.34% | 8,490,353 | $287,738,063 | $76,281,577 | -$211,456,486 | -73.49% | |
| Deerfield Management Company, L.P. | 1.51% | 4,264,789 | $144,533,699 | $38,316,997 | -$106,216,702 | -73.49% | |
| Viking Global Investors | Ole Andreas Halvorsen | 0.41% | 4,203,567 | $142,458,886 | $37,766,948 | -$104,691,938 | -73.49% |
| Bain Capital Life Sciences Investors, Llc | 7.67% | 3,806,566 | $129,004,522 | $34,200,092 | -$94,804,430 | -73.49% | |
| Maverick Capital Ltd | 1.00% | 3,267,802 | $110,745,810 | $29,359,567 | -$81,386,243 | -73.49% | |
| Duquesne Family Office Llc | Stanley Druckenmiller | 2.39% | 3,070,146 | $104,047,000 | $27,583,727 | -$76,463,273 | -73.49% |
| Medicxi Ventures Management (Jersey) Ltd | 42.19% | 2,208,639 | $74,850,776 | $19,843,517 | -$55,007,259 | -73.49% | |
| Janus Henderson Group Plc | 0.04% | 2,258,984 | $72,253,603 | $20,295,842 | -$51,957,761 | -71.91% | |
| Jennison Associates Llc | 0.04% | 2,102,286 | $71,246,471 | $18,887,989 | -$52,358,482 | -73.49% | |
| Orbis Allan Gray Ltd | 0.20% | 1,747,627 | $59,227,079 | $15,701,555 | -$43,525,524 | -73.49% | |
| Polar Capital Holdings Plc | 0.17% | 1,724,518 | $58,443,915 | $15,493,932 | -$42,949,983 | -73.49% | |
| Capital International Investors | 0.01% | 1,723,495 | $58,409,246 | $15,484,741 | -$42,924,505 | -73.49% | |
| Goldman Sachs Group Inc | 0.01% | 1,544,911 | $52,357,034 | $13,880,253 | -$38,476,781 | -73.49% | |
| Westfield Capital Management Co Lp | 0.17% | 1,536,472 | $52,071,036 | $13,804,433 | -$38,266,603 | -73.49% | |
| Castle Hook Partners Lp | 0.50% | 1,371,005 | $46,463,359 | $12,317,794 | -$34,145,565 | -73.49% | |
| Ameriprise Financial Inc | 0.01% | 1,253,549 | $42,482,886 | $11,262,511 | -$31,220,375 | -73.49% | |
| Alliancebernstein L.P. | 0.01% | 1,259,940 | $40,330,679 | $11,319,931 | -$29,010,748 | -71.93% | |
| Price T Rowe Associates Inc | 0.00% | 1,167,357 | $39,562,000 | $10,488,119 | -$29,073,881 | -73.49% | |
| Jpmorgan Chase & Co | 0.00% | 1,132,955 | $38,373,185 | $10,179,034 | -$28,194,151 | -73.47% | |
| Aberdeen Group Plc | 0.05% | 1,102,785 | $37,373,384 | $9,907,972 | -$27,465,412 | -73.49% | |
| Blackrock, Inc. | 0.00% | 1,063,750 | $36,050,487 | $9,557,262 | -$26,493,225 | -73.49% | |
| Timessquare Capital Management, Llc | 0.40% | 796,162 | $26,981,930 | $7,153,117 | -$19,828,813 | -73.49% | |
| Bnp Paribas Asset Management Holding S.A. | 0.03% | 781,140 | $26,472,835 | $7,018,152 | -$19,454,683 | -73.49% | |
| Susquehanna International Group, Llp | 0.02% | 754,327 | $25,564,142 | $6,777,251 | -$18,786,891 | -73.49% | |
| Woodline Partners Lp | 0.08% | 752,489 | $25,501,852 | $6,760,737 | -$18,741,115 | -73.49% | |
| Bank Of America Corp | 0.00% | 735,483 | $24,925,518 | $6,607,947 | -$18,317,571 | -73.49% | |
| Nwi Management Lp | 1.52% | 702,000 | $23,791,000 | $6,307,119 | -$17,483,881 | -73.49% | |
| American Century Companies Inc | 0.01% | 684,813 | $23,208,343 | $6,152,702 | -$17,055,641 | -73.49% | |
| Citadel Advisors Llc | 0.01% | 645,805 | $21,886,331 | $5,802,235 | -$16,084,096 | -73.49% | |
| Rock Springs Capital Management Lp | 0.96% | 582,744 | $19,749,194 | $5,235,663 | -$14,513,531 | -73.49% | |
| First Turn Management, Llc | 2.11% | 582,497 | $19,740,823 | $5,233,444 | -$14,507,379 | -73.49% | |
| Morgan Stanley | 0.00% | 575,825 | $19,514,724 | $5,173,500 | -$14,341,224 | -73.49% | |
| Adage Capital Partners Gp, L.L.C. | 0.03% | 550,000 | $18,639,500 | $4,941,475 | -$13,698,025 | -73.49% | |
| Artia Global Partners Lp | 3.25% | 503,936 | $17,078,391 | $4,527,613 | -$12,550,778 | -73.49% | |
| Millennium Management Llc | 0.01% | 501,614 | $16,999,698 | $4,506,751 | -$12,492,947 | -73.49% | |
| Cormorant Asset Management, Lp | 0.87% | 500,000 | $16,945,000 | $4,492,250 | -$12,452,750 | -73.49% | |
| Jane Street Group, Llc | 0.01% | 474,236 | $16,071,858 | $4,260,773 | -$11,811,085 | -73.49% | |
| Kennedy Capital Management Llc | 0.25% | 421,374 | $14,280,365 | $3,785,835 | -$10,494,530 | -73.49% | |
| Bank Of New York Mellon Corp | 0.00% | 353,298 | $11,973,270 | $3,174,206 | -$8,799,064 | -73.49% | |
| Hrt Financial Lp | 0.02% | 349,843 | $11,856,000 | $3,143,164 | -$8,712,836 | -73.49% | |
| Ubs Group Ag | 0.00% | 344,065 | $11,660,363 | $3,091,252 | -$8,569,111 | -73.49% | |
| Slate Path Capital Lp | 0.15% | 319,000 | $10,810,910 | $2,866,056 | -$7,944,855 | -73.49% | |
| Lord, Abbett & Co. Llc | 0.03% | 306,560 | $10,389,000 | $2,754,288 | -$7,634,712 | -73.49% | |
| Exoduspoint Capital Management, Lp | 0.10% | 304,334 | $10,313,879 | $2,734,289 | -$7,579,590 | -73.49% | |
| Eversept Partners, Lp | 0.51% | 275,471 | $9,335,712 | $2,474,969 | -$6,860,743 | -73.49% | |
| Affinity Asset Advisors, Llc | 0.46% | 275,000 | $9,319,750 | $2,470,738 | -$6,849,013 | -73.49% |
Frequently asked questions about NAMSW
Who are the largest institutional holders of NAMSW?
The largest institutional holders of NAMSW reported in the latest SEC Form 13F filings include Frazier Life Sciences Management, L.P., Capital World Investors, Fmr Llc, Ra Capital Management, L.P., and Fcpm Iii Services B.V.. InsiderSet ranks institutional holders by their latest reported NAMSW position.
What is NAMSW institutional ownership?
This page tracks NAMSW positions reported by institutional investment managers through SEC Form 13F. NEWAMSTERDAM PHARMA COMPANY (NAMSW) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own NAMSW?
InsiderSet currently tracks 189 institutional managers reporting NAMSW holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of NAMSW shareholders.
How much NAMSW stock do institutions own?
Institutional investment managers disclosed approximately $4.06B in NAMSW holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was NAMSW institutional ownership last updated?
The latest NAMSW institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional NAMSW holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its NAMSW position after the reporting date.
Are institutions buying or selling NAMSW?
Institutional buying and selling can be analyzed by comparing NAMSW positions across consecutive 13F reporting periods. InsiderSet's NAMSW Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View NAMSW ownership changes.
How has NAMSW institutional ownership changed over time?
InsiderSet tracks NAMSW institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.