Kastelein Johannes Jacob Pieter
CIK 2000389 · Chief Scientific Officer · last filed 2026-03-09
Kastelein Johannes Jacob Pieter is a Chief Scientific Officer who has filed 10 SEC Form 4 insider transactions across 1 company since 2024. The most recent filing, for NAMSW, was dated Mar 9, 2026. Across all open-market trades the lifetime net is −$17.5M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.9M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$2.86M
1
10
-$17.46M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| NAMSW | Chief Scientific Officer | 153,591 | $18.60 | $2.86M | -$17.46M | 10 | 2026-03-09 |
Recent Filings
10 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-09 | NAMSW | Mixed | — | -$9.09M | EDGAR |
| 2026-02-24 | NAMSW | Sell (S) | −45,481 | -$1.61M | EDGAR |
| 2026-01-07 | NAMSW | Mixed | +19,500 | -$199.5K | EDGAR |
| 2025-08-25 | NAMSW | Sell (S) | −100,000 | -$2.47M | EDGAR |
| 2025-03-28 | NAMSW | Mixed | +64,783 | $0 | EDGAR |
| 2025-03-26 | NAMSW | Exer (M) | +150,000 | $0 | EDGAR |
| 2025-01-07 | NAMSW | Grant (A) | +34,000 | $0 | EDGAR |
| 2025-01-06 | NAMSW | Grant (A) | — | $0 | EDGAR |
| 2024-03-27 | NAMSW | Mixed | — | -$4.35M | EDGAR |
| 2024-01-03 | NAMSW | Grant (A) | — | $0 | EDGAR |