NAMS NewAmsterdam Pharma Co N.V.
Nasdaq · SEC CIK 1936258 · EDGAR
- Bought, last 12 months
- $226.5K 1 purchases by 1 insiders
- Sold, last 12 months
- $62.00M 19 sales by 6 insiders
- Filings on record
- 108 since 2024-01-03, latest 2026-09-15 16:30
BoughtSold
Most active insiders, 12 months
| Insider | Title | Bought | Sold |
|---|---|---|---|
| Davidson Michael H. | CEO, Dir | $226.5K | $25.33M |
| Kooij Louise Frederika | CAO | — | $16.75M |
| Kastelein Johannes Jacob Pieter | CSO, Dir | — | $14.26M |
| Somaiya Mayur Ian | CFO | — | $3.43M |
| LANGE LOUIS G | Dir | — | $2.19M |
| Smither John W | Dir | — | $40.5K |
| Gunning Robert William | VP, Ctrl | — | — |
| van der Kamp Hilde Johanna | Dir | — | — |
| McKenna Mark C. | Dir | — | — |
| Gulfo Adele M. | Dir | — | — |
Transactions 122
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-09-15 16:30 | 2026-09-14 | NAMS | Davidson Michael H. | CEO, Dir | P - Purchase | $22.65 | +10.0K | 792.9K | +1% | +$226.5K | |
| 2026-09-09 16:30 | 2026-09-04 | NAMS | Smither John W | Dir | S - Sale | $25.32 | -1,600 | 8,760 | -15% | -$40.5K | |
| D | 2026-09-03 16:30 | 2026-09-01 | NAMS | Gunning Robert William | VP, Ctrl | A - Grant | $0.00 | +3,200 | 3,200 | New | $0 |
| DTI | 2026-08-25 16:30 | 2026-08-24 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | M - OptEx | — | +125.0K | 194.3K | +180% | — |
| DTI | 2026-08-25 16:30 | 2026-08-24 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | S - Sale+OE | $26.91 | -125.0K | 69.3K | -64% | -$3.36M |
| DMT | 2026-07-22 16:05 | 2026-07-20 | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $11.34 | +105.0K | 129.4K | +431% | +$1.19M |
| DMT | 2026-07-22 16:05 | 2026-07-20 | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $30.34 | -105.0K | 24.4K | -81% | -$3.19M |
| DMT | 2026-06-24 16:10 | 2026-06-22 | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $11.28 | +40.0K | 64.4K | +164% | +$451.0K |
| DMT | 2026-06-24 16:10 | 2026-06-22 | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $30.20 | -40.0K | 24.4K | -62% | -$1.21M |
| DMT | 2026-05-27 16:30 | 2026-05-26 | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $10.07 | +65.0K | 89.4K | +267% | +$654.5K |
| DT | 2026-05-27 16:30 | 2026-05-26 | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $35.69 | -65.0K | 24.4K | -73% | -$2.32M |
| M | 2026-03-12 | 2026-03-11 | NAMS | LANGE LOUIS G | Dir | S - Sale | $30.42 | -44.6K | 10.8K | -81% | -$1.36M |
| D | 2026-03-10 | 2026-03-09 | NAMS | LANGE LOUIS G | Dir | X - OptEx | $11.50 | +44.6K | 55.0K | +431% | +$513.1K |
| DI | 2026-03-10 | 2026-03-06 | NAMS | LANGE LOUIS G | Dir | S - Sale+OE | $29.41 | -28.2K | 0 | -100% | -$829.0K |
| DMTI | 2026-03-09 | 2026-03-05+ | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | M - OptEx | — | +300.0K | 170.7K | New | — |
| DMTI | 2026-03-09 | 2026-03-05+ | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | S - Sale+OE | $30.30 | -300.0K | 69.3K | -81% | -$9.09M |
| D | 2026-03-02 | 2026-03-02 | NAMS | Davidson Michael H. | CEO, Dir | S - Sale+OE | $33.25 | -443.7K | 174.1K | -72% | -$14.75M |
| D | 2026-03-02 | 2026-03-02 | NAMS | Davidson Michael H. | CEO, Dir | M - OptEx | — | +443.7K | 617.9K | +255% | — |
| DMT | 2026-02-26 | 2026-02-24+ | NAMS | Davidson Michael H. | CEO, Dir | M - OptEx | — | +306.3K | 643.2K | +91% | — |
| DMT | 2026-02-26 | 2026-02-24+ | NAMS | Davidson Michael H. | CEO, Dir | S - Sale+OE | $34.53 | -306.3K | 174.1K | -64% | -$10.58M |
| M | 2026-02-24 | 2026-02-20 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | S - Sale | $35.31 | -45.5K | 84.3K | -35% | -$1.61M |
| DMT | 2026-01-29 | 2026-01-27+ | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $10.90 | +72.4K | 64.2K | New | +$789.5K |
| DMT | 2026-01-29 | 2026-01-27+ | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $32.25 | -72.4K | 24.4K | -75% | -$2.34M |
| DMT | 2026-01-27 | 2026-01-23+ | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $10.90 | +72.6K | 58.8K | New | +$791.0K |
| DMT | 2026-01-27 | 2026-01-23+ | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $33.29 | -72.6K | 24.4K | -75% | -$2.42M |
| DMT | 2026-01-22 | 2026-01-20+ | NAMS | Somaiya Mayur Ian | CFO | M - OptEx | $9.26 | +100.0K | 98.2K | New | +$926.0K |
| DMT | 2026-01-22 | 2026-01-20+ | NAMS | Somaiya Mayur Ian | CFO | S - Sale+OE | $32.61 | -100.0K | 117.7K | -46% | -$3.26M |
| D | 2026-01-09 | 2026-01-07 | NAMS | McKenna Mark C. | Dir | A - Grant | — | +3,400 | 10.4K | +49% | — |
| DT | 2026-01-09 | 2026-01-07 | NAMS | Davidson Michael H. | CEO, Dir | A - Grant | — | +81.0K | 459.9K | +21% | — |
| DT | 2026-01-09 | 2026-01-07 | NAMS | Davidson Michael H. | CEO, Dir | S - Sale | — | -11.6K | 378.9K | -3% | — |
| D | 2026-01-09 | 2026-01-07 | NAMS | Gulfo Adele M. | Dir | A - Grant | — | +3,400 | 14.3K | +31% | — |
| D | 2026-01-09 | 2026-01-07 | NAMS | Smither John W | Dir | A - Grant | — | +3,400 | 10.4K | +49% | — |
| D | 2026-01-09 | 2026-01-07 | NAMS | van der Kamp Hilde Johanna | Dir | A - Grant | — | +3,400 | 10.4K | +49% | — |
| D | 2026-01-09 | 2026-01-07 | NAMS | Lewis William | Dir | A - Grant | — | +3,400 | 10.4K | +49% | — |
| D | 2026-01-09 | 2026-01-07 | NAMS | LANGE LOUIS G | Dir | A - Grant | — | +3,400 | 10.4K | +49% | — |
| DT | 2026-01-07 | 2026-01-07 | NAMS | Somaiya Mayur Ian | CFO | A - Grant | — | +25.5K | 58.4K | +78% | — |
| DT | 2026-01-07 | 2026-01-05 | NAMS | Somaiya Mayur Ian | CFO | S - Sale | $33.25 | -5,118 | 32.9K | -13% | -$170.2K |
| DT | 2026-01-07 | 2026-01-05 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | S - Sale | $33.25 | -6,000 | 73.5K | -8% | -$199.5K |
| DT | 2026-01-07 | 2026-01-07 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | A - Grant | — | +25.5K | 99.0K | +35% | — |
| DT | 2026-01-07 | 2026-01-07 | NAMS | Kooij Louise Frederika | CAO | A - Grant | — | +12.0K | 24.4K | +97% | — |
| DT | 2026-01-07 | 2026-01-05 | NAMS | Kooij Louise Frederika | CAO | S - Sale | $33.25 | -2,647 | 12.4K | -18% | -$88.0K |
| DMT | 2025-12-29 | 2025-12-23+ | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $10.03 | +145.0K | 41.0K | New | +$1.45M |
| DMT | 2025-12-29 | 2025-12-23+ | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $35.84 | -145.0K | 15.0K | -91% | -$5.20M |
| I | 2025-09-17 | 2025-09-15 | NAMS | Topper James N | Dir | P - Purchase | $23.70 | +660 | 3.03M | +0.0% | +$15.6K |
| I | 2025-09-10 | 2025-09-08 | NAMS | Topper James N | Dir | P - Purchase | $24.99 | +1,260 | 3.03M | +0.0% | +$31.5K |
| DM | 2025-09-10 | 2025-09-09 | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $25.83 | -150.0K | 111.9K | -57% | -$3.87M |
| D | 2025-09-10 | 2025-09-09 | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $10.00 | +150.0K | 165.0K | +1,000% | +$1.50M |
| 2025-09-05 | 2025-09-03 | NAMS | Kooij Louise Frederika | CAO | S - Sale | $25.09 | -18.1K | 15.0K | -55% | -$453.5K | |
| D | 2025-09-04 | 2025-09-02 | NAMS | Kooij Louise Frederika | CAO | M - OptEx | — | +18.1K | 33.1K | +120% | — |
| 2025-08-27 | 2025-08-25 | NAMS | Kooij Louise Frederika | CAO | S - Sale | $24.86 | -8,269 | 15.0K | -36% | -$205.6K | |
| MI | 2025-08-25 | 2025-08-21+ | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | S - Sale | $24.72 | -100.0K | 77.0K | -57% | -$2.47M |
| I | 2025-08-13 | 2025-08-11 | NAMS | Topper James N | Dir | P - Purchase | $23.98 | +471 | 3.03M | +0.0% | +$11.3K |
| DMT | 2025-07-17 | 2025-07-15+ | NAMS | Kling Douglas F | COO | M - OptEx | $10.90 | +98.6K | 95.0K | New | +$1.07M |
| DMT | 2025-07-17 | 2025-07-15+ | NAMS | Kling Douglas F | COO | S - Sale+OE | $21.26 | -98.6K | 44.0K | -69% | -$2.10M |
| MI | 2025-06-26 | 2025-06-24+ | NAMS | Topper James N | Dir | P - Purchase | $18.37 | +3,780 | 3.03M | +0.1% | +$69.5K |
| DMT | 2025-06-18 | 2025-06-16 | NAMS | Kling Douglas F | COO | M - OptEx | $10.20 | +100.0K | 122.1K | +452% | +$1.02M |
| DMT | 2025-06-18 | 2025-06-16 | NAMS | Kling Douglas F | COO | S - Sale+OE | $19.29 | -100.0K | 62.1K | -62% | -$1.93M |
| I | 2025-06-18 | 2025-06-16 | NAMS | Topper James N | Dir | P - Purchase | $19.50 | +8,584 | 3.02M | +0.3% | +$167.4K |
| DI | 2025-06-03 | 2025-06-01 | NAMS | LANGE LOUIS G | Dir | M - OptEx | $0.00 | +68 | 28.2K | +0.2% | $0 |
| D | 2025-06-03 | 2025-06-01 | NAMS | Marino Michael F III | See Remarks | A - Grant | — | +55.0K | 55.0K | New | — |
| DT | 2025-05-19 | 2025-05-15 | NAMS | Kling Douglas F | COO | M - OptEx | $10.00 | +100.0K | 144.0K | +227% | +$1.00M |
| DT | 2025-05-19 | 2025-05-15 | NAMS | Kling Douglas F | COO | S - Sale+OE | — | -100.0K | 44.0K | -69% | — |
| DI | 2025-05-02 | 2025-05-01 | NAMS | LANGE LOUIS G | Dir | M - OptEx | $0.00 | +69 | 28.1K | +0.2% | $0 |
| DI | 2025-04-21 | 2025-04-14 | NAMS | LANGE LOUIS G | Dir | M - OptEx | $0.00 | +69 | 28.0K | +0.2% | $0 |
| D | 2025-04-17 | 2025-04-15 | NAMS | Gulfo Adele M. | Dir | A - Grant | — | +10.9K | 10.9K | New | — |
| DT | 2025-04-17 | 2025-04-15 | NAMS | Kling Douglas F | COO | M - OptEx | $10.00 | +100.0K | 144.0K | +227% | +$1.00M |
| DMT | 2025-04-17 | 2025-04-15 | NAMS | Kling Douglas F | COO | S - Sale+OE | — | -100.0K | 44.0K | -69% | — |
| D | 2025-03-28 | 2025-03-26 | NAMS | LANGE LOUIS G | Dir | M - OptEx | $0.00 | +3,102 | 10.1K | +45% | $0 |
| D | 2025-03-28 | 2025-03-26 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | M - OptEx | $0.00 | +45.5K | 79.5K | +134% | $0 |
| DI | 2025-03-28 | 2025-03-26 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | A - Grant | $0.00 | +19.3K | 169.3K | +13% | $0 |
| D | 2025-03-28 | 2025-03-26 | NAMS | Davidson Michael H. | CEO, Dir | M - OptEx | $0.00 | +38.4K | 402.7K | +11% | $0 |
| D | 2025-03-28 | 2025-03-26 | NAMS | Davidson Michael H. | CEO, Dir | S - Sale+OE | — | -12.3K | 390.4K | -3% | — |
| D | 2025-03-28 | 2025-03-26 | NAMS | Davidson Michael H. | CEO, Dir | A - Grant | $0.00 | +31.0K | 364.3K | +9% | $0 |
| I | 2025-03-28 | 2025-03-26 | NAMS | Topper James N | Dir | P - Purchase | $22.49 | +1,135 | 3.01M | +0.0% | +$25.5K |
| D | 2025-03-28 | 2025-03-26 | NAMS | Kooij Louise Frederika | CAO | M - OptEx | $0.00 | +8,269 | 23.3K | +55% | $0 |
| D | 2025-03-28 | 2025-03-26 | NAMS | Kling Douglas F | COO | S - Sale+OE | — | -16.5K | 44.0K | -27% | — |
| D | 2025-03-28 | 2025-03-26 | NAMS | Kling Douglas F | COO | M - OptEx | $0.00 | +16.5K | 60.5K | +38% | $0 |
| DI | 2025-03-26 | 2025-03-24 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | M - OptEx | — | +150.0K | 150.0K | New | — |
| DMT | 2025-03-19 | 2025-03-17 | NAMS | Kling Douglas F | COO | M - OptEx | $10.00 | +100.0K | 132.1K | +311% | +$1.00M |
| DT | 2025-03-19 | 2025-03-17 | NAMS | Kling Douglas F | COO | S - Sale+OE | — | -100.0K | 44.0K | -69% | — |
| I | 2025-03-06 | 2025-03-04 | NAMS | Topper James N | Dir | P - Purchase | $21.02 | +4,005 | 3.01M | +0.1% | +$84.2K |
| D | 2025-03-05 | 2025-03-04 | NAMS | Kooij Louise Frederika | CAO | M - OptEx | — | +150.0K | 165.0K | +1,000% | — |
| D | 2025-03-05 | 2025-03-04 | NAMS | Kooij Louise Frederika | CAO | S - Sale+OE | $20.37 | -150.0K | 15.0K | -91% | -$3.06M |
| DMT | 2025-02-20 | 2025-02-18+ | NAMS | Kling Douglas F | COO | M - OptEx | — | +100.0K | 53.2K | New | — |
| DMT | 2025-02-20 | 2025-02-18+ | NAMS | Kling Douglas F | COO | S - Sale+OE | — | -100.0K | 44.0K | -69% | — |
| DMT | 2025-01-31 | 2025-01-29+ | NAMS | Kling Douglas F | COO | M - OptEx | — | +70.4K | 100.9K | +232% | — |
| DMT | 2025-01-31 | 2025-01-29+ | NAMS | Kling Douglas F | COO | S - Sale+OE | — | -70.4K | 44.0K | -62% | — |
| DMT | 2025-01-29 | 2025-01-27+ | NAMS | Kling Douglas F | COO | S - Sale+OE | — | -129.6K | 49.1K | -72% | — |
| DMT | 2025-01-29 | 2025-01-27+ | NAMS | Kling Douglas F | COO | M - OptEx | — | +129.6K | 69.4K | New | — |
| DMT | 2025-01-29 | 2025-01-27+ | NAMS | Somaiya Mayur Ian | CFO | S - Sale+OE | — | -61.9K | 51.3K | -55% | — |
| DMT | 2025-01-29 | 2025-01-27+ | NAMS | Somaiya Mayur Ian | CFO | M - OptEx | $9.26 | +61.9K | 52.9K | New | +$573.0K |
| D | 2025-01-08 | 2025-01-07 | NAMS | Smither John W | Dir | A - Grant | — | +6,960 | 6,960 | New | — |
| D | 2025-01-08 | 2025-01-07 | NAMS | McKenna Mark C. | Dir | A - Grant | — | +6,960 | 6,960 | New | — |
| D | 2025-01-08 | 2025-01-07 | NAMS | Lewis William | Dir | A - Grant | — | +6,960 | 6,960 | New | — |
| D | 2025-01-08 | 2025-01-07 | NAMS | LANGE LOUIS G | Dir | A - Grant | — | +6,960 | 6,960 | New | — |
| D | 2025-01-08 | 2025-01-07 | NAMS | van der Kamp Hilde Johanna | Dir | A - Grant | — | +6,960 | 6,960 | New | — |
| 2025-01-07 | 2025-01-07 | NAMS | Kooij Louise Frederika | CAO | A - Grant | — | +15.0K | 15.0K | New | — | |
| D | 2025-01-07 | 2025-01-07 | NAMS | Davidson Michael H. | CEO, Dir | A - Grant | — | +123.5K | 123.5K | New | — |
| 2025-01-07 | 2025-01-07 | NAMS | Kastelein Johannes Jacob Pieter | CSO, Dir | A - Grant | — | +34.0K | 34.0K | New | — | |
| 2025-01-07 | 2025-01-07 | NAMS | JONES WILLIAM A JR | Chief Commercial Off | A - Grant | — | +43.0K | 43.0K | New | — |
Purchase Sale Sale after option exercise All abbreviations