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NAMS SCHEDULE 13D/A: SEC filing

Frazier Life Sciences funds (FLSPF, FLS XI, FLS XII)

Filed with the SEC on · accession 0001231919-26-001215

NAMS filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Sep 22, 2026. Frazier Life Sciences funds (FLSPF, FLS XI, FLS XII) reported open-market purchases of NewAmsterdam Pharma ordinary shares over the past 60 days, acquiring shares at prices ranging from roughly $21.08 to $25.50. The stock moved +3.3% by the first close after the filing.

Summary of the filing

Frazier Life Sciences funds (FLSPF, FLS XI, FLS XII) reported open-market purchases of NewAmsterdam Pharma ordinary shares over the past 60 days, acquiring shares at prices ranging from roughly $21.08 to $25.50. The filing is an amendment to a Schedule 13D disclosing incremental insider/affiliate buying.

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Key details

Approximate total value of disclosed open-market purchases (sum of shares x weighted average price)$17.5M
Reporting person / purchaserFrazier Life Sciences Public Fund, L.P. (FLSPF)
Reporting person / purchaserFrazier Life Sciences XI, L.P. (FLS XI)
Reporting person / purchaserFrazier Life Sciences XII, L.P. (FLS XII)
IssuerNewAmsterdam Pharma Company N.V.

How NAMS stock reacted

Close before

$22.58

Sep 21, 2026

First close after

+3.28%

$23.32

5 trading days

+4.43%

$23.58

Since filing

-16.30%

$18.90

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Frequently asked questions

What did NAMS file with the SEC on Sep 22, 2026?

NAMS filed a SCHEDULE 13D/A (SEC filing). Frazier Life Sciences funds (FLSPF, FLS XI, FLS XII) reported open-market purchases of NewAmsterdam Pharma ordinary shares over the past 60 days, acquiring shares at prices ranging from roughly $21.08 to $25.50. The filing is an amendment to a Schedule 13D disclosing incremental insider/affiliate buying.

How do I read a SCHEDULE 13D/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

How did NAMS stock react to this filing?

NAMS closed at $22.58 before the filing and $23.32 on Sep 22, 2026 (+3.28%). Five trading days later: $23.58 (+4.43%).

Other NAMS SEC filings

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