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$NAMS All transactions

NewAmsterdam Pharma Co N.V.

M

$ Value

Shares

101,409

Price

Filed

Mar 9

Insider

Name

Kastelein Johannes Jacob Pieter

Title

Chief Scientific Officer

CIK

0002000389

Roles

Director Officer

Transaction Details

Transaction Date

2026-03-09

Code

M

Table

Non-Derivative

Ownership

Indirect

Equity Swap

No

Shares After

170,711

Footnotes

The exercise price of the option is EUR 1.16392. | The Ordinary Shares are held by Futurum B.V. ("Futurum") for the benefit of the Reporting Person. The Reporting Person exercises sole voting and investment control over the Ordinary Shares held by Futurum. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 per share to $30.55 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 per share to $30.42 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 per share to $30.80 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction. | The option was granted on November 22, 2022 to replace an option originally granted on July 6, 2021 which was cancelled in connection with the consummation of NewAmsterdam Pharma Company N.V.'s business combination with Frazier Lifesciences Acquisition Corporation. 292,214 of the shares underlying the option immediately vested on the grant date. 25% of the remaining shares underlying the option vested on January 1, 2021, the one-year anniversary of vesting start date, with the remaining shares vesting in equal monthly installments thereafter for three years, subject to the Reporting Person's continued service through each such date. | The option was granted to and is held by Futurum through NAP PoolCo B.V. ("PoolCo") for the benefit of the Reporting Person. The Reporting Person exercises sole voting and investment control over the securities held by Futurum through PoolCo. PoolCo has no voting or investment control or pecuniary interest in the securities held on behalf of Futurum. Upon exercise of the option, the Ordinary Shares were issued to Futurum directly, pursuant to a written agreement among Futurum, PoolCo and the Issuer.

Filing Info

Accession No.

0001193125-26-099073

Form Type

4

Issuer CIK

0001936258

Kastelein Johannes Jacob Pieter's History

Date Ticker Type Value
2026-03-09 NAMS M
2026-03-09 NAMS $3.1M
2026-03-09 NAMS M $0
2026-03-06 NAMS M
2026-03-06 NAMS $2.9M
2026-03-06 NAMS M $0
2026-03-05 NAMS M
2026-03-05 NAMS $3.2M
2026-03-05 NAMS M $0
2026-02-20 NAMS $514K

Other Insiders at NAMS (90d)

Insider Bought Sold Last
LANGE LOUIS G $2.2M 2026-03-11
Davidson Michael H.
Chief Executive Officer
$25.3M 2026-03-02
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
$10.7M 2026-03-09
Kooij Louise Frederika
Chief Accounting Officer
$4.8M 2026-01-28