NewAmsterdam Pharma Co Ownership & Insider Activity

NewAmsterdam Pharma Co (NAMS) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 0.5% of shares outstanding. Institutional investors hold 37.7%.

Shares Outstanding

119.537M

Shares Float

102.169M

Insider Shares Owned

533.543K

Insider % Owned

0.5%

Institutional Shares Held

44.378M

Institutional % Held

37.7%

Ownership Breakdown

Net Insider Activity by Month

NewAmsterdam Pharma Co Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Jul 20, 2026	Louise Kooij	CHIEF ACCOUNTING OFFICER	SELL-OPTIONS	—	$20.84	$2.0M
Jun 22, 2026	Louise Kooij	CHIEF ACCOUNTING OFFICER	SELL-OPTIONS	—	$20.74	$757K
May 26, 2026	Louise Kooij	CHIEF ACCOUNTING OFFICER	SELL-OPTIONS	—	$22.88	$1.7M
Mar 11, 2026	Louis G Lange	—	SELL	44.619K	$30.42	$1.4M
Mar 6, 2026	Louis G Lange	—	SELL-OPTIONS	16.433K	$20.45	$316K
Mar 5, 2026	Johannes Jacob Pieter Kastelein	CHIEF SCIENTIFIC OFFICER	SELL-OPTIONS	—	$30.30	$9.1M
Mar 2, 2026	Michael H Davidson	CHIEF EXECUTIVE OFFICER	SELL-OPTIONS	—	$33.25	$14.8M
Feb 24, 2026	Michael H Davidson	CHIEF EXECUTIVE OFFICER	SELL-OPTIONS	—	$34.53	$10.6M
Feb 20, 2026	Johannes Jacob Pieter Kastelein	CHIEF SCIENTIFIC OFFICER	SELL	45.481K	$35.31	$1.6M