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NAMS — NewAmsterdam Pharma Co N.V.

Materials · Pharmaceutical Preparations · Nasdaq

CIK 0001936258 · FYE 1231 · All Form 4 filings on EDGAR ↗

Formerly: NewAmsterdam Pharma Co B.V. (until 2022-11-22)

1Insiders filing

3Transactions

+$0Reported buys

−$3.4MReported sells

0Cluster events

Window in data: 2026-08-24 → 2026-08-24 · Data as of 2026-08-28

Insiders

Insider	Role	Txns	Reported value
Kastelein Johannes Jacob Pieter	Chief Scientific Officer	3	$3.4M

Transaction history

Filing date	Trade date	Ticker	Insider	Type	Shares	Price	Value	Cluster
2026-08-25	2026-08-24	NAMS	Kastelein Johannes Jacob Pieter Chief Scientific Officer 10b5-1	M routine	125,000	—	—	—
2026-08-25	2026-08-24	NAMS	Kastelein Johannes Jacob Pieter Chief Scientific Officer 10b5-1	S	125,000	$26.91	−$3.4M	—
2026-08-25	2026-08-24	NAMS	Kastelein Johannes Jacob Pieter Chief Scientific Officer 10b5-1	M routine	125,000	—	—	—

Known data limitations

Form 4 lag: insiders have 2 business days to file after a trade (weekends and holidays extend this), and this site re-ingests once daily — a transaction can appear here roughly three business days after it happened.
13F lag: quarterly 13F-HR holdings cover the prior quarter-end and are due 45 days after it — every institutional position shown here is at least 45 days old by construction, often more.
CUSIP→ticker gaps: 13F positions are reported by CUSIP; some holdings cannot be matched to a current ticker (delistings, corporate actions, thin metadata) and appear without one or are omitted from ticker-level views.
EDGAR timing variability: institutions file at different hours and days within their windows; amended filings (4/A, 13F-HR/A) can restate earlier periods, so historical aggregates may change between batches.

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