The following table details the insider trading activities
(stock purchases, stock sales, and stock option exercises) of Kastelein Johannes Jacob Pieter since 2024.
This trader's CIK number is 2000389.
At the time of last reporting, Kastelein Johannes Jacob Pieter was the Chief Scientific Officer of Newamsterdam Pharma Co N.v.. (stock ticker symbol NAMS).
Also see all insider trading activities at Newamsterdam Pharma Co N.v..
| Insider Buying | Insider Sales | Option Exercises | |||||
|---|---|---|---|---|---|---|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
| 2025 | NAMS | 0 | $0 | 100,000 | $2,478,750 | 195,481 | $0 |
| 2024 | NAMS | 0 | $0 | 190,476 | $4,095,234 | 201,673 | $0 |
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|---|---|---|---|---|
| 2025-08-22 | NAMS | Sale | 50,000 | 25.29 | 1,264,250 |
| 2025-08-21 | NAMS | Sale | 50,000 | 24.29 | 1,214,500 |
| 2025-03-26 | NAMS | Option Ex | 45,481 | .00 | 0 |
| 2025-03-24 | NAMS | Option Ex | 150,000 | .00 | 0 |
| 2024-03-26 | NAMS | Sale | 190,476 | 21.50 | 4,095,234 |
| 2024-03-26 | NAMS | Option Ex | 201,673 | .00 | 0 |
Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Kastelein Johannes Jacob Pieter (Chief Scientific Officer of Newamsterdam Pharma Co N.v. at the time of this reporting) see the Securities and Exchange Commission (SEC) website.