DaveManuel.com · Institutional Ownership · Who Owns It
NEWAMSTERDAM PHARMA COMPANY (NAMS)
Institutional ownership reported to the SEC as of Q2 2026, across 16 quarters.
201
Reporting holders
$4.2B
Reported value
102.1%
Of shares outstanding
0.3%
Calls
2.0%
Puts
+25
Holder change
Institutions report 121,990,566 shares against 119,537,169 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Frazier Life Sciences Management, L.P. | $613.0M | 18,088,902 | 13.35% | 15q | +6.8%+$38.8M |
| Capital World Investors | $414.5M | 12,230,557 | 0.05% | 7q | +10.1%+$38.0M |
| FMR LLC | $350.4M | 10,339,663 | 0.02% | 10q | +18.0%+$53.3M |
| RA CAPITAL MANAGEMENT, L.P. | $323.7M | 9,550,191 | 2.81% | 15q | HELD |
| FCPM III SERVICES B.V. | $287.7M | 8,490,353 | 38.34% | 11q | -7.7%-$24.0M |
| DEERFIELD MANAGEMENT COMPANY, L.P. | $144.5M | 4,264,789 | 1.51% | 10q | HELD |
| VIKING GLOBAL INVESTORS LP | $142.5M | 4,203,567 | 0.41% | 15q | HELD |
| Bain Capital Life Sciences Investors, LLC | $129.0M | 3,806,566 | 7.67% | 15q | -47.9%-$118.6M |
| MAVERICK CAPITAL LTD | $110.7M | 3,267,802 | 0.98% | 7q | +49.5%+$36.6M |
| Duquesne Family Office LLC | $104.0M | 3,070,146 | 2.00% | 8q | HELD |
| Jupiter Topco LLC | $86.0M | 2,535,682 | 0.04% | new | FIRST |
| Medicxi Ventures Management (Jersey) Ltd | $74.9M | 2,208,639 | 42.19% | 15q | -17.4%-$15.8M |
| JENNISON ASSOCIATES LLC | $71.2M | 2,102,286 | 0.04% | 10q | -23.6%-$22.0M |
| Orbis Allan Gray Ltd | $59.2M | 1,747,627 | 0.20% | new | NEW |
| Polar Capital Holdings Plc | $58.4M | 1,724,518 | 0.14% | 11q | -39.1%-$37.5M |
| Capital International Investors | $58.4M | 1,723,495 | 0.01% | 7q | +19.6%+$9.6M |
| GOLDMAN SACHS GROUP INC | $52.9M incl. $576.1K options CALL | 1,544,911 | 0.00% | 11q | -20.6%-$13.8M |
| WESTFIELD CAPITAL MANAGEMENT CO LP | $52.1M | 1,536,472 | 0.17% | 2q | -30.3%-$22.6M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $49.8M incl. $24.3M options CALL+PUT | 754,327 | 0.00% | 7q | +4131.8%+$48.7M |
| Castle Hook Partners LP | $46.5M | 1,371,005 | 0.21% | 3q | +31.5%+$11.1M |
| AMERIPRISE FINANCIAL INC | $42.5M | 1,253,549 | 0.01% | 6q | +66.5%+$17.0M |
| ALLIANCEBERNSTEIN L.P. | $40.3M | 1,259,940 | 0.01% | 7q | +5.1%+$1.9M |
| PRICE T ROWE ASSOCIATES INC /MD/ | $39.6M | 1,167,357 | 0.00% | new | NEW |
| JPMORGAN CHASE & CO | $38.4M | 1,132,955 | 0.00% | 10q | +28.1%+$8.4M |
| Aberdeen Group plc | $37.4M | 1,102,785 | 0.05% | 9q | +31.8%+$9.0M |
| BlackRock, Inc. | $36.1M | 1,063,750 | 0.00% | 8q | +20.0%+$6.0M |
| FRANKLIN RESOURCES INC | $33.7M | 993,917 | 0.01% | 6q | +29.1%+$7.6M |
| TimesSquare Capital Management, LLC | $27.0M | 796,162 | 0.40% | 10q | +5.9%+$1.5M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $26.5M | 781,140 | 0.03% | 3q | -18.4%-$6.0M |
| Woodline Partners LP | $25.5M | 752,489 | 0.08% | 9q | HELD |
| BANK OF AMERICA CORP /DE/ | $24.9M | 735,483 | 0.00% | 10q | -13.2%-$3.8M |
| Jefferies Financial Group Inc. | $24.5M incl. $20.3M options PUT | 122,728 | 0.16% | new | NEW |
| NWI MANAGEMENT LP | $23.8M | 702,000 | 1.10% | 3q | HELD |
| AMERICAN CENTURY COMPANIES INC | $23.2M | 684,813 | 0.01% | 7q | +31.8%+$5.6M |
| CITADEL ADVISORS LLC | $23.2M incl. $1.3M options CALL | 645,805 | 0.00% | 12q | -9.3%-$2.4M |
| Rock Springs Capital Management LP | $19.7M | 582,744 | 0.96% | 8q | -1.0%-$205.0K |
| First Turn Management, LLC | $19.7M | 582,497 | 2.11% | 5q | +4.3%+$818.8K |
| MORGAN STANLEY | $19.5M | 575,825 | 0.00% | 14q | +3.6%+$680.0K |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | $18.6M | 550,000 | 0.03% | 13q | -50.3%-$18.9M |
| Artia Global Partners LP | $17.1M | 503,936 | 3.15% | 5q | HELD |
| MILLENNIUM MANAGEMENT LLC | $17.0M | 501,614 | 0.01% | 3q | +65.1%+$6.7M |
| PERCEPTIVE ADVISORS LLC | $16.9M PUT | options only | 0.25% | new | OPTIONS |
| Cormorant Asset Management, LP | $16.9M | 500,000 | 0.87% | 10q | -47.4%-$15.3M |
| JANE STREET GROUP, LLC | $16.7M incl. $654.1K options CALL+PUT | 474,236 | 0.00% | 8q | +187.1%+$10.9M |
| KENNEDY CAPITAL MANAGEMENT LLC | $14.3M | 421,374 | 0.25% | 5q | +3.2%+$436.6K |
| Ikarian Capital, LLC | $13.6M PUT | options only | 1.46% | new | OPTIONS |
| Bank of New York Mellon Corp | $12.0M | 353,298 | 0.00% | 5q | -6.7%-$864.3K |
| HRT FINANCIAL LP | $11.9M | 349,843 | 0.02% | new | NEW |
| UBS Group AG | $11.7M | 344,065 | 0.00% | 11q | -56.7%-$15.3M |
| Slate Path Capital LP | $10.8M | 319,000 | 0.15% | 7q | HELD |
| LORD, ABBETT & CO. LLC | $10.4M | 306,560 | 0.03% | 3q | +56.9%+$3.8M |
| ExodusPoint Capital Management, LP | $10.3M | 304,334 | 0.07% | new | NEW |
| Eversept Partners, LP | $9.3M | 275,471 | 0.48% | 14q | -3.6%-$348.8K |
| Affinity Asset Advisors, LLC | $9.3M | 275,000 | 0.42% | 13q | HELD |
| SEB Asset Management AB | $9.2M | 272,654 | 0.03% | 2q | HELD |
| Atle Fund Management AB | $8.4M | 248,848 | 2.27% | 10q | +162.5%+$5.2M |
| LMR Partners LLP | $8.4M CALL+PUT | options only | 0.03% | 2q | OPTIONS |
| GILDER GAGNON HOWE & CO LLC | $7.6M | 224,070 | 0.08% | 4q | -7.2%-$589.9K |
| WELLINGTON MANAGEMENT GROUP LLP | $7.4M | 218,749 | 0.00% | 10q | -95.7%-$166.0M |
| Ensign Peak Advisors, Inc | $7.2M | 212,423 | 0.01% | 3q | -14.8%-$1.2M |
| ArrowMark Colorado Holdings LLC | $7.2M | 211,843 | 0.30% | 10q | -18.4%-$1.6M |
| Point72 Asset Management, L.P. | $7.0M incl. $1.2M options CALL+PUT | 168,901 | 0.01% | 2q | HELD |
| DEUTSCHE BANK AG\ | $6.8M | 199,931 | 0.00% | 8q | +60.2%+$2.5M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $6.2M | 181,674 | 0.00% | 2q | +34.5%+$1.6M |
| Decheng Capital LLC | $6.0M | 176,887 | 0.82% | 9q | -45.6%-$5.0M |
| VICTORY CAPITAL MANAGEMENT INC | $5.9M | 172,663 | 0.00% | 2q | HELD |
| PEREGRINE CAPITAL MANAGEMENT LLC | $5.7M | 169,488 | 0.19% | 2q | -5.0%-$305.2K |
| BOOTHBAY FUND MANAGEMENT, LLC | $5.3M incl. $4.1M options PUT | 35,756 | 0.07% | 7q | +30.8%+$1.3M |
| Mizuho Markets Cayman LP | $5.1M | 150,539 | 0.19% | 3q | +188.2%+$3.3M |
| TD Asset Management Inc | $5.0M | 148,400 | 0.00% | new | NEW |
| XTX Topco Ltd | $4.9M | 145,008 | 0.06% | 4q | HELD |
| Jump Financial, LLC | $4.9M | 144,512 | 0.04% | new | NEW |
| DCF Advisers, LLC | $4.8M | 141,000 | 0.84% | 8q | -12.2%-$664.2K |
| KORNITZER CAPITAL MANAGEMENT INC /KS | $4.7M | 139,933 | 0.10% | new | NEW |
| Handelsbanken Fonder AB | $4.1M | 122,400 | 0.01% | 7q | -70.8%-$10.0M |
| Swiss National Bank | $4.1M | 121,100 | 0.00% | 9q | +36.2%+$1.1M |
| D. E. Shaw & Co., Inc. | $4.1M | 120,561 | 0.00% | new | NEW |
| ADAR1 Capital Management, LLC | $4.0M | 118,623 | 0.18% | 5q | HELD |
| ALPS ADVISORS INC | $4.0M | 118,145 | 0.02% | 3q | +26.2%+$832.0K |
| STATE STREET CORP | $3.9M | 115,215 | 0.00% | 9q | +82.6%+$1.8M |
| Walleye Capital LLC | $3.8M | 111,819 | 0.01% | 3q | +91.4%+$1.8M |
| Caption Management, LLC | $3.8M CALL+PUT | options only | 0.02% | 7q | OPTIONS |
| GEODE CAPITAL MANAGEMENT, LLC | $3.6M | 105,169 | 0.00% | 14q | +0.7%+$26.2K |
| Swedbank AB | $3.5M | 104,100 | 0.00% | 3q | +3.2%+$108.4K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $3.3M | 96,232 | 0.00% | 7q | +751.5%+$2.9M |
| NORTHERN TRUST CORP | $3.2M | 93,971 | 0.00% | 7q | +191.7%+$2.1M |
| Squarepoint Ops LLC | $3.1M | 92,026 | 0.00% | 5q | +113.9%+$1.7M |
| Moody Aldrich Partners LLC | $3.1M | 90,617 | 0.55% | 3q | -21.2%-$825.5K |
| Schonfeld Strategic Advisors LLC | $3.0M | 89,765 | 0.01% | new | NEW |
| Bellevue Group AG | $2.9M | 86,994 | 0.06% | 8q | +214.5%+$2.0M |
| ALGERT GLOBAL LLC | $2.8M | 81,340 | 0.03% | new | NEW |
| Man Group plc | $2.7M | 80,832 | 0.00% | new | NEW |
| TUDOR INVESTMENT CORP ET AL | $2.7M | 79,460 | 0.00% | new | NEW |
| Y-Intercept (Hong Kong) Ltd | $2.6M | 78,136 | 0.05% | new | NEW |
| STEMPOINT CAPITAL LP | $2.6M | 77,589 | 0.45% | 6q | -78.5%-$9.6M |
| Headlands Technologies LLC | $2.5M | 72,335 | 0.26% | 2q | +161.4%+$1.5M |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | $2.3M | 67,418 | 0.00% | 9q | +24.1%+$443.6K |
| Pavaki Capital Management LLC | $2.3M | 66,600 | 0.79% | 2q | +82.0%+$1.0M |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | $2.1M | 63,298 | 0.00% | 3q | +34.9%+$554.5K |
| FOX RUN MANAGEMENT, L.L.C. | $2.0M | 59,477 | 0.33% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-09-22 | 13D/A | Frazier Life Sciences Public Fund, L.P.with 14 co-filers | 8.7% |
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-08-14 | 2026-08-10 | Directors or officers departed or appointed | filing |
| 2026-08-14 | 2026-07-16 | Directors or officers departed or appointed | filing |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-24 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sold | 125,000 | $3.4M |
| 2026-07-20 | Kooij Louise Frederika | Chief Accounting Officer | Sold | 105,000 | $3.2M ×3 |
| 2026-05-26 | Kooij Louise Frederika | Chief Accounting Officer | Sold | 65,000 | $2.3M |
| 2026-09-30 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | Sold | 50,246 | $1.3M |
| 2026-06-22 | Kooij Louise Frederika | Chief Accounting Officer | Sold | 40,000 | $1.2M ×2 |
| 2026-09-14 | Davidson Michael H. | Chief Executive Officer | Bought | 10,000 | $226.5K |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 21 | $8.3M | 343,801 | 4 | 6 | 3 | 0.0% |
| Q2 2026 | 201 | $4.2B | 121,990,566 | 45 | 69 | 50 | 2.3% |
| Q1 2026 | 176 | $4.0B | 123,832,049 | 23 | 64 | 49 | 0.7% |
| Q4 2025 | 189 | $4.2B | 119,353,693 | 53 | 50 | 50 | 0.6% |
| Q3 2025 | 140 | $3.5B | 121,886,713 | 21 | 46 | 41 | 2.0% |
| Q2 2025 | 132 | $2.1B | 116,386,652 | 25 | 56 | 30 | 0.3% |
| Q1 2025 | 128 | $2.3B | 111,177,846 | 27 | 50 | 32 | 0.7% |
| Q4 2024 | 133 | $2.6B | 98,611,632 | 45 | 42 | 31 | 0.8% |
| Q3 2024 | 102 | $1.3B | 77,112,707 | 22 | 42 | 16 | 0.1% |
| Q2 2024 | 91 | $1.4B | 72,267,966 | 25 | 29 | 15 | 0.0% |
| Q1 2024 | 76 | $1.7B | 72,511,836 | 44 | 13 | 10 | 0.0% |
| Q4 2023 | 34 | $708.2M | 62,202,546 | 4 | 10 | 5 | 1.9% |
| Q3 2023 | 35 | $466.8M | 50,178,896 | 9 | 9 | 6 | 0.6% |
| Q2 2023 | 29 | $584.1M | 48,833,993 | 10 | 13 | 1 | 0.6% |
| Q1 2023 | 20 | $448.7M | 33,346,896 | 8 | 4 | 1 | 0.9% |
| Q4 2022 | 14 | $362.2M | 33,516,836 | 14 | 0 | 0 | 0.0% |