Johannes Jacob Pieter Kastelein $NAMS SEC Form 4 Insider Trading

Johannes Jacob Pieter Kastelein has filed a total of 4 insider trades in $NAMS since 2021. Their most recent trade was a sale of 50,000 shares, made on Aug 21, 2025. Their largest trade was a sale of 190,476 shares, made on Mar 26, 2024. We estimate that they now own 148,783 shares of $NAMS, worth an estimated $3.7 million.

Insider Trading at $NAMS

There have been a total of 72 insider trades reported at $NAMS since 2021, with 44,428 shares purchased and 2.7 million shares sold. The most active insider traders in $NAMS stock have been Douglas F Kling, Louise Frederika Kooij, and Johannes Jacob Pieter Kastelein. The most recent trade was a purchase of 660 shares reported by James N Topper (None), made on Sep 15, 2025.

$NAMS Executives and Stock Owners with Insider Trades

• Douglas F Kling, Chief Operating Officer

• Louise Frederika Kooij, Chief Accounting Officer

• Johannes Jacob Pieter Kastelein, Chief Scientific Officer

• Mayur Ian Somaiya, Chief Financial Officer

• Michael H. Davidson, Chief Executive Officer

• Juliette Berangere Audet, Chief Business Officer

*This is only based off of information found in SEC filings, and may not reflect actual net worth. There may also be inaccuracies due to privately holdings filing errors, parsing errors, accidental double-counting of shares, incorrect classification of indirectly owned shares, sales prior to dataset start date, or any other number of issues.