Johannes Jacob Pieter Kastelein Net Worth
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Johannes Jacob Pieter Kastelein has an estimated net worth of at least $11.9 million*, as of Oct. 29, 2025. They own 168,283 shares of NAMS stock. They have sold 296,476 shares of NAMS stock since 2021, for an estimated $6.6 million.
Johannes Jacob Pieter Kastelein $NAMS SEC Form 4 Insider Trading
Johannes Jacob Pieter Kastelein has filed a total of 5 insider trades in $NAMS since 2021. Their most recent trade was a sale of 6,000 shares, made on Jan 05, 2026. Their largest trade was a sale of 190,476 shares, made on Mar 26, 2024. We estimate that they now own 168,283 shares of $NAMS, worth an estimated $5.3 million.
Insider Trading at $NAMS
There have been a total of 90 insider trades reported at $NAMS since 2021, with 44,428 shares purchased and 3.1 million shares sold. The most active insider traders in $NAMS stock have been Douglas F Kling, Louise Frederika Kooij, and Mayur Ian Somaiya. The most recent trade was a sale of 32,612 shares reported by Louise Frederika Kooij (Chief Accounting Officer), made on Jan 28, 2026.
History of Insider Stock Trades by Johannes Jacob Pieter Kastelein
| Company Ticker | Purchase / Sale | Shares | Date | Disclosed (EST) |
|---|---|---|---|---|
NAMS
|
Sale | 6,000 | Jan 05, 2026 | Jan. 7, 2026, 7:31 p.m. |
|
NAMS
|
Sale | 50,000 | Aug 21, 2025 | Aug. 25, 2025, 5:04 p.m. |
|
NAMS
|
Sale | 42,342 | Aug 22, 2025 | Aug. 25, 2025, 5:04 p.m. |
|
NAMS
|
Sale | 7,658 | Aug 22, 2025 | Aug. 25, 2025, 5:04 p.m. |
|
NAMS
|
Sale | 190,476 | Mar 26, 2024 | March 27, 2024, 4:30 p.m. |
$NAMS Executives and Stock Owners with Insider Trades
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Douglas F Kling, Chief Operating Officer
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Louise Frederika Kooij, Chief Accounting Officer
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Mayur Ian Somaiya, Chief Financial Officer
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Johannes Jacob Pieter Kastelein, Chief Scientific Officer
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Michael H. Davidson, Chief Executive Officer
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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.