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Insider selling
Johannes Jacob Pieter Kastelein sold $3.4M of NewAmsterdam Pharma Co N.V. (NAMS) stock
Johannes Jacob Pieter Kastelein, Chief Scientific Officer of NewAmsterdam Pharma Co N.V. (NAMS), sold 125,000 shares of NAMS stock worth $3.4M, per an SEC Form 4 filed Aug 25, 2026.
The sale was pre-arranged (a 10b5-1 plan or an option exercise), not a fresh decision.
The trade happened on Aug 24, 2026, 1 day before it was made public.
NAMS has moved -15.9% since the trade date, from $26.85 to $22.58 (Sep 21, 2026 close).
- Traded
- Aug 24, 2026
- Disclosed
- Aug 25, 2026
- Filing delay
- 1 day
- Price since
- -15.9%
- Role
- Chief Scientific Officer
- Source
- SEC Form 4
More NAMS insider and Congress trades
From a public SEC Form 4, linked above. Not investment advice, and not a recommendation to buy or sell.