NAMS · Insider trading · 13F holders · Congress trades
NewAmsterdam Pharma Co N.V. (NAMS)
Who is buying and selling NAMS: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 25
- Insider buys, 90 days
- $227K
- Insider sales, 90 days
- $4.7M
- Congress trades, 12 months
- 0
NAMS at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 3 NAMS insiders filed 1 open-market purchase worth $227K and 3 sales worth $4.7M on SEC Form 4; 2 of the sales were pre-planned under Rule 10b5-1.
- 25 13F filers hold NAMS among their 50 largest positions, worth $1.9B combined, including Peter Kolchinsky, Stanley Druckenmiller, James Flynn and Lee Ainslie. The biggest bets by portfolio weight are Fcpm III Services B.v. (38.3%), Frazier Life Sciences Management, L.P. (13.3%) and Bain Capital Life Sciences Investors, LLC (7.7%). In their latest 13Fs, 1 manager opened a new position and 4 added to one.
- No member of Congress has disclosed a trade in NAMS.
- NAMS last closed at $20.76 on Oct 29, 2026.
NAMS insider trading
Between Aug 1, 2026 and Oct 29, 2026, 3 NAMS insiders filed 1 open-market purchase worth $227K and 3 sales worth $4.7M on SEC Form 4; 2 of the sales were pre-planned under Rule 10b5-1.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 2, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer, Director | Sale10b5-1 | 50,246 | $25.03 | $1.3M | SEC |
| Sep 15, 2026 | Davidson Michael H. | Chief Executive Officer, Director | Buy | 10,000 | $22.65 | $227K | SEC |
| Sep 9, 2026 | Smither John W | Director | Sale | 1,600 | $25.32 | $41K | SEC |
| Aug 25, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer, Director | Sale10b5-1 | 125,000 | $26.91 | $3.4M | SEC |
Who owns NAMS? Hedge funds and superinvestors
25 13F filers hold NAMS among their 50 largest positions, worth $1.9B combined, including Peter Kolchinsky, Stanley Druckenmiller, James Flynn and Lee Ainslie. The biggest bets by portfolio weight are Fcpm III Services B.v. (38.3%), Frazier Life Sciences Management, L.P. (13.3%) and Bain Capital Life Sciences Investors, LLC (7.7%). In their latest 13Fs, 1 manager opened a new position and 4 added to one.
Superinvestors holding NAMS: Peter Kolchinsky 2.8% · Stanley Druckenmiller 2.4% · James Flynn 1.8% · Lee Ainslie 1.0% · David Greenspan 0.1%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Frazier Life Sciences Management, L.P.Hedge fund | 13.3% | $613.0M | 18,088,902 | +6.8% shares | Q2 2026 |
| Peter KolchinskyHedge fund | 2.8% | $323.7M | 9,550,191 | +0.0% shares | Q2 2026 |
| Fcpm III Services B.v.Hedge fund | 38.3% | $287.7M | 8,490,353 | -7.7% shares | Q2 2026 |
| James FlynnHedge fund | 1.8% | $144.5M | 4,264,789 | +0.0% shares | Q2 2026 |
| Bain Capital Life Sciences Investors, LLCAsset manager | 7.7% | $129.0M | 3,806,566 | -47.9% shares | Q2 2026 |
| Lee AinslieSuperinvestor · Hedge fund | 1.0% | $110.7M | 3,267,802 | +49.5% shares | Q2 2026 |
| Stanley DruckenmillerFamily office | 2.4% | $104.0M | 3,070,146 | +0.0% shares | Q2 2026 |
| Castle Hook Partners LPHedge fund | 0.5% | $46.5M | 1,371,005 | +31.5% shares | Q2 2026 |
| Nwi Management LPHedge fund | 1.5% | $23.8M | 702,000 | New | Q2 2026 |
| Rock Springs Capital Management LPHedge fund | 1.0% | $19.7M | 582,744 | -1.0% shares | Q2 2026 |
| First Turn Management, LLCInstitutional asset manager | 2.1% | $19.7M | 582,497 | +4.3% shares | Q2 2026 |
| Artia Global Partners LPHedge fund | 3.2% | $17.1M | 503,936 | +0.0% shares | Q2 2026 |
| Cormorant Asset Management, LPHedge fund | 0.9% | $16.9M | 500,000 | -47.4% shares | Q2 2026 |
| David GreenspanHedge fund | 0.1% | $10.8M | 319,000 | +0.0% shares | Q2 2026 |
| Eversept Partners, LPHedge fund | 0.5% | $9.3M | 275,471 | -3.6% shares | Q2 2026 |
| Atle Fund Management ABAsset manager | 2.3% | $8.4M | 248,848 | +162.5% shares | Q2 2026 |
| Decheng Capital LLCHedge fund | 0.8% | $6.0M | 176,887 | -45.6% shares | Q2 2026 |
| Mizuho Markets Cayman LPHedge fund | 0.2% | $5.1M | 150,539 | — | Q2 2026 |
| DCF Advisers, LLCAsset manager | 1.3% | $4.8M | 141,000 | -12.2% shares | Q2 2026 |
| Fox Run Management, L.l.c.Investment manager | 0.3% | $2.0M | 59,477 | — | Q2 2026 |
| Pavaki Capital Management LLCHedge fund | 0.8% | $1.6M | 66,600 | +0.0% shares | Q3 2026 |
| Palo Alto Investors LPHedge fund | 0.2% | $1.5M | 44,359 | — | Q2 2026 |
| Fieldview Capital Management, LLCHedge fund | 0.4% | $1.4M | 41,842 | — | Q2 2026 |
| Ishara Investments LPHedge fund | 0.9% | $1.3M | 36,900 | +0.0% shares | Q2 2026 |
| Dupont Capital Management CorpInstitutional asset manager | 0.0% | $24K | 1 | +0.0% shares | Q3 2026 |
Each manager counts with its latest 13F (Q3 2026: 2, Q2 2026: 23). Screen NAMS in the grand portfolio →
NAMS stock trades by members of Congress
No member of Congress has disclosed a trade in NAMS.
NAMS questions and answers
Are insiders buying NAMS stock?
Between Aug 1, 2026 and Oct 29, 2026, 3 NAMS insiders filed 1 open-market purchase worth $227K and 3 sales worth $4.7M on SEC Form 4; 2 of the sales were pre-planned under Rule 10b5-1.
Which hedge funds own NAMS?
25 13F filers hold NAMS among their 50 largest positions, worth $1.9B combined, including Peter Kolchinsky, Stanley Druckenmiller, James Flynn and Lee Ainslie. The biggest bets by portfolio weight are Fcpm III Services B.v. (38.3%), Frazier Life Sciences Management, L.P. (13.3%) and Bain Capital Life Sciences Investors, LLC (7.7%). In their latest 13Fs, 1 manager opened a new position and 4 added to one.
Has Congress traded NAMS?
No member of Congress has disclosed a trade in NAMS.
Who is the largest holder of NAMS?
Among 13F filers, Frazier Life Sciences Management, L.P. reports the largest NAMS position, $613.0M (18,088,902 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Fcpm III Services B.v.'s: 38.3% of its portfolio.
Cite or share this
Free to use with a link back. The data updates every filing day.