NAMS insider trading — NewAmsterdam Pharma Co N.V.
Over the last 90 days, insiders at NewAmsterdam Pharma Co N.V. (NAMS) made 1 open-market purchase worth $226K and 1 open-market sale worth $41K, making them net buyers by $186K. The largest purchase was by Davidson Michael H. (Chief Executive Officer), who bought 10,000 shares for $226K on Sep 14, 2026. The largest sale was by Smither John W (Director), who sold 1,600 shares for $41K on Sep 4, 2026.
Updated Oct 16, 2026.
Recent NAMS insider transactions
Every Form 4 filed by NewAmsterdam Pharma Co N.V. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 30, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M · Option exercise · 10b5-1 | Indirect | 50,246 | — | — | Form 4 |
| Sep 30, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | S · Sale · 10b5-1 | Indirect | 50,246 | $25.03 | $1.26M | Form 4 |
| Sep 14, 2026 | Davidson Michael H. | Chief Executive Officer | P · Purchase | Direct | 10,000 | $22.65 | $226K | Form 4 |
| Sep 4, 2026 | Smither John W | Director | S · Sale | Direct | 1,600 | $25.32 | $41K | Form 4 |
| Sep 1, 2026 | Gunning Robert William | Vice President, Controller | A · Grant/award | Direct | 3,200 | — | — | Form 4 |
| Aug 24, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | M · Option exercise · 10b5-1 | Indirect | 125,000 | — | — | Form 4 |
| Aug 24, 2026 | Kastelein Johannes Jacob Pieter | Chief Scientific Officer | S · Sale · 10b5-1 | Indirect | 125,000 | $26.91 | $3.36M | Form 4 |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | M · Option exercise · 10b5-1 | Direct | 105,000 | $11.34 | $1.19M | Form 4 |
| Jul 20, 2026 | Kooij Louise Frederika | Chief Accounting Officer | S · Sale · 10b5-1 | Direct | 105,000 | $30.34 | $3.19M | Form 4 |
NAMS insider trading FAQ
Are insiders buying NAMS stock?
Yes. In the last 90 days, NewAmsterdam Pharma Co N.V. insiders made 1 open-market purchase totaling $226K, and 1 open-market sale totaling $41K. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading NAMS?
Recent buyers: Davidson Michael H.. Recent sellers: Smither John W.
Where does NAMS insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.