NewAmsterdam Pharma Co N.V. (NAMS)
NewAmsterdam Pharma Co N.V. (NAMS) Insider Trading
Directors, officers and holders of more than 10% of NAMS report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 281 transactions on file: 1 with code P, 19 with code S and 30 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 30, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 50,246 | Not measured | Not measured |
| Sep 30, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | S Sale | 50,246 | $25.03 | $1,257,657 |
| Sep 30, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 50,246 | Not measured | Not measured |
| Sep 14, 2026 | Davidson Michael H. | Chief Executive Officer | P Purchase | 10,000 | $22.65 | $226,500 |
| Sep 4, 2026 | Smither John W | Director | S Sale | 1,600 | $25.32 | $40,512 |
| Sep 1, 2026 | Gunning Robert William | Vice President, Controller | A Award | 3,200 | Not measured | Not measured |
| Sep 1, 2026 | Gunning Robert William | Vice President, Controller | A Award | 14,000 | Not measured | Not measured |
| Aug 24, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 125,000 | Not measured | Not measured |
| Aug 24, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | S Sale | 125,000 | $26.91 | $3,363,750 |
| Aug 24, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 125,000 | Not measured | Not measured |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 25,000 | $11.90 | $297,500 |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | S Sale | 31,885 | $31.05 | $990,029 |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 80,000 | $11.17 | $893,600 |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | S Sale | 2,915 | $31.71 | $92,435 |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | S Sale | 70,200 | $29.96 | $2,103,192 |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 80,000 | Not measured | Not measured |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 25,000 | Not measured | Not measured |
| Jun 22, 2026 | Kooij Louise Frederika | Chief Accounting Officer | S Sale | 39,700 | $30.20 | $1,198,940 |
| Jun 22, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 25,000 | $10.90 | $272,500 |
| Jun 22, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 15,000 | $11.90 | $178,500 |
| Jun 22, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 25,000 | Not measured | Not measured |
| Jun 22, 2026 | Kooij Louise Frederika | Chief Accounting Officer | S Sale | 300 | $30.73 | $9,219 |
| Jun 22, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 15,000 | Not measured | Not measured |
| May 26, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 5,000 | Not measured | Not measured |
| May 26, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 60,000 | Not measured | Not measured |
| May 26, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 5,000 | $10.90 | $54,500 |
| May 26, 2026 | Kooij Louise Frederika | Chief Accounting Officer | S Sale | 65,000 | $35.69 | $2,319,850 |
| May 26, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M Exercise | 60,000 | $10.00 | $600,000 |
| Mar 11, 2026 | LANGE LOUIS G | Director | S Sale | 44,173 | $30.41 | $1,343,301 |
| Mar 11, 2026 | LANGE LOUIS G | Director | S Sale | 446 | $31.23 | $13,929 |
| Mar 9, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | S Sale | 101,409 | $30.29 | $3,071,679 |
| Mar 9, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 101,409 | Not measured | Not measured |
| Mar 9, 2026 | LANGE LOUIS G | Director | X In-the-Money | 44,619 | $11.50 | $513,119 |
| Mar 9, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 101,409 | Not measured | Not measured |
| Mar 9, 2026 | LANGE LOUIS G | Director | X In-the-Money | 44,619 | Not measured | Not measured |
| Mar 6, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | S Sale | 94,124 | $30.32 | $2,853,840 |
| Mar 6, 2026 | LANGE LOUIS G | Director | S Sale | 28,186 | $29.41 | $828,950 |
| Mar 6, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 94,124 | Not measured | Not measured |
| Mar 6, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 94,124 | Not measured | Not measured |
| Mar 5, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 104,467 | Not measured | Not measured |
| Mar 5, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M Exercise | 104,467 | Not measured | Not measured |
| Mar 5, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | S Sale | 104,467 | $30.30 | $3,165,350 |
| Mar 2, 2026 | Davidson Michael H. | Chief Executive Officer | M Exercise | 443,707 | Not measured | Not measured |
| Mar 2, 2026 | Davidson Michael H. | Chief Executive Officer | S Sale | 443,707 | $33.25 | $14,753,258 |
| Mar 2, 2026 | Davidson Michael H. | Chief Executive Officer | M Exercise | 443,707 | Not measured | Not measured |
| Feb 26, 2026 | Davidson Michael H. | Chief Executive Officer | M Exercise | 183,332 | Not measured | Not measured |
| Feb 26, 2026 | Davidson Michael H. | Chief Executive Officer | M Exercise | 183,332 | Not measured | Not measured |
| Feb 26, 2026 | Davidson Michael H. | Chief Executive Officer | S Sale | 17,924 | $34.44 | $617,303 |
| Feb 26, 2026 | Davidson Michael H. | Chief Executive Officer | S Sale | 165,408 | $33.63 | $5,562,671 |
| Feb 25, 2026 | Davidson Michael H. | Chief Executive Officer | S Sale | 46,517 | $35.11 | $1,633,212 |
The full Form 4 history is on the NAMS company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.