Form 4 for NAMS NewAmsterdam Pharma Co N.V.

Accepted 2026-01-09 00:00:00 ET · period of report 2026-01-07 · accession 0001193125-26-009268 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-01-09	2026-01-07	NAMS	LANGE LOUIS G	Dir	A - Grant	—	+3,400	10.4K	+49%	—
D	2026-01-09	2026-01-07	NAMS	LANGE LOUIS G	Dir	A - Grant	$0.00	+15.3K	15.3K	New	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Ordinary Shares	2026-01-07	A	A	3,400	—	10,360	D	—	—	(F1) Represents restricted stock units (RSUs), each representing a contingent right to receive one ordinary share. All of the RSUs will vest on the one-year anniversary of the vesting start date, subject to the Reporting Person's continued service through such date. (F2) Each RSU was granted on January 7, 2026 for no consideration. (F3) The Reporting Person inadvertently reported the ownership of 3,102 ordinary shares issued upon vesting of RSUs on March 28, 2025 to his direct holdings. Such ordinary shares are held directly by LGLange III Trust DTD10 for the benefit of the Reporting Person. The Reporting Person subsequently corrected his indirect holdings on April 21, 2025, and the Reporting Person's indirect holdings reported on May 2, 2025 and June 3, 2025 are correct. This Form 4 reflects the Reporting Person's correct direct holdings.
2	Derivative	Option (right to buy)	2026-01-07	A	A	15,300	$0.00	15,300	D	$35.45 · — to 2036-01-07	15,300 Ordinary Shares	(F4) All of the ordinary shares underlying the option will vest on January 2, 2027, the one-year anniversary of the vesting start date, subject to the Reporting Person's continued service through such date.