Get email alerts when NAMS insiders make a move — free, no credit card

NAMS Insider Trading & Form 4 Activity

NewAmsterdam Pharma Co N.V.
Last filing: Mar 12, 2026·1mo ago· Data may be outdated
BEARISH · LAST 90 DAYS
0%
buyers
$0
0 buys
$18.5M
6 sells
-$18.5M
net selling
3
insiders
Tracking NAMS insiders takes 3 seconds. Get free alerts →
ACTIVE SELLING CLUSTER

3 insiders sold a combined $17.2M of NAMS between Feb 20, 2026 and Mar 6, 2026.

Kastelein Johannes Jacob Pieter, Davidson Michael H., LANGE LOUIS G

Don't miss the next NAMS cluster. Tracenotes detected this one — get the next alert free.

Net flow — last 12 months

Monthly net of insider buys minus sells. Green months indicate net buying; red months indicate net selling.

Most active insiders

Ranked by total transaction value over the last 90 days.

INSIDERBOUGHTSOLDNET
Davidson Michael H.
Chief Executive Officer
$25.3M
-$25.3M
Kastelein Johannes Jacob Pieter
Chief Scientific Officer
$10.7M
-$10.7M
LANGE LOUIS G
Director
$2.2M
-$2.2M

Recent transactions

Every Form 4 transaction for NAMS, newest first.

SELL
LANGE LOUIS G · Director
Tx Mar 11·Filed Mar 12·EDGAR ↗
446 sh @ $31.23
$14K
SELL
LANGE LOUIS G · Director
Tx Mar 11·Filed Mar 12·EDGAR ↗
44,173 sh @ $30.41
$1.3M
OTHER
LANGE LOUIS G · Director
Tx Mar 9·Filed Mar 10·EDGAR ↗
44,619 sh @ $11.50
$513K
SELL
LANGE LOUIS G · Director
Tx Mar 6·Filed Mar 10·EDGAR ↗
28,186 sh @ $29.41
$829K
SELL10b5-1
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Mar 9·Filed Mar 9·EDGAR ↗
101,409 sh @ $30.29
$3.1M
EXERCISE10b5-1
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Mar 9·Filed Mar 9·EDGAR ↗
101,409 sh
EXERCISE10b5-1
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Mar 6·Filed Mar 9·EDGAR ↗
94,124 sh
SELL10b5-1
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Mar 6·Filed Mar 9·EDGAR ↗
94,124 sh @ $30.32
$2.9M
SELL10b5-1
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Mar 5·Filed Mar 9·EDGAR ↗
104,467 sh @ $30.30
$3.2M
EXERCISE10b5-1
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Mar 5·Filed Mar 9·EDGAR ↗
104,467 sh
EXERCISE
Davidson Michael H. · Chief Executive Officer
Tx Mar 2·Filed Mar 2·EDGAR ↗
443,707 sh
SELL
Davidson Michael H. · Chief Executive Officer
Tx Mar 2·Filed Mar 2·EDGAR ↗
443,707 sh @ $33.25
$14.8M
EXERCISE10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 26·Filed Feb 26·EDGAR ↗
183,332 sh
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 26·Filed Feb 26·EDGAR ↗
165,408 sh @ $33.63
$5.6M
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 26·Filed Feb 26·EDGAR ↗
17,924 sh @ $34.44
$617K
EXERCISE10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 25·Filed Feb 26·EDGAR ↗
58,253 sh
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 25·Filed Feb 26·EDGAR ↗
46,517 sh @ $35.11
$1.6M
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 25·Filed Feb 26·EDGAR ↗
10,436 sh @ $35.96
$375K
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 25·Filed Feb 26·EDGAR ↗
1,300 sh @ $36.68
$48K
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 24·Filed Feb 26·EDGAR ↗
3,161 sh @ $36.46
$115K
EXERCISE10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 24·Filed Feb 26·EDGAR ↗
64,708 sh
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Feb 24·Filed Feb 26·EDGAR ↗
61,547 sh @ $36.13
$2.2M
SELL
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Feb 20·Filed Feb 24·EDGAR ↗
14,692 sh @ $35.00
$514K
SELL
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Feb 20·Filed Feb 24·EDGAR ↗
30,789 sh @ $35.46
$1.1M
EXERCISE10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 28·Filed Jan 29·EDGAR ↗
32,612 sh @ $10.90
$355K
SELL10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 28·Filed Jan 29·EDGAR ↗
32,612 sh @ $31.80
$1.0M
EXERCISE10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 27·Filed Jan 29·EDGAR ↗
39,816 sh @ $10.90
$434K
SELL10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 27·Filed Jan 29·EDGAR ↗
39,816 sh @ $32.62
$1.3M
EXERCISE10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 26·Filed Jan 27·EDGAR ↗
34,400 sh @ $10.90
$375K
SELL10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 26·Filed Jan 27·EDGAR ↗
34,091 sh @ $32.77
$1.1M
SELL10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 26·Filed Jan 27·EDGAR ↗
309 sh @ $33.45
$10K
EXERCISE10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 23·Filed Jan 27·EDGAR ↗
38,172 sh @ $10.90
$416K
SELL10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 23·Filed Jan 27·EDGAR ↗
25,405 sh @ $33.44
$850K
SELL10b5-1
Kooij Louise Frederika · Chief Accounting Officer
Tx Jan 23·Filed Jan 27·EDGAR ↗
12,767 sh @ $34.37
$439K
SELL10b5-1
Somaiya Mayur Ian · Chief Financial Officer
Tx Jan 21·Filed Jan 22·EDGAR ↗
15,422 sh @ $33.25
$513K
EXERCISE10b5-1
Somaiya Mayur Ian · Chief Financial Officer
Tx Jan 21·Filed Jan 22·EDGAR ↗
39,784 sh @ $9.26
$368K
SELL10b5-1
Somaiya Mayur Ian · Chief Financial Officer
Tx Jan 21·Filed Jan 22·EDGAR ↗
24,362 sh @ $33.80
$823K
SELL10b5-1
Somaiya Mayur Ian · Chief Financial Officer
Tx Jan 20·Filed Jan 22·EDGAR ↗
39,712 sh @ $31.78
$1.3M
EXERCISE10b5-1
Somaiya Mayur Ian · Chief Financial Officer
Tx Jan 20·Filed Jan 22·EDGAR ↗
60,216 sh @ $9.26
$558K
SELL10b5-1
Somaiya Mayur Ian · Chief Financial Officer
Tx Jan 20·Filed Jan 22·EDGAR ↗
19,604 sh @ $32.38
$635K
SELL10b5-1
Somaiya Mayur Ian · Chief Financial Officer
Tx Jan 20·Filed Jan 22·EDGAR ↗
900 sh @ $30.64
$28K
AWARD
McKenna Mark C. · Director
Tx Jan 7·Filed Jan 9·EDGAR ↗
3,400 sh
AWARD
LANGE LOUIS G · Director
Tx Jan 7·Filed Jan 9·EDGAR ↗
3,400 sh
AWARD
van der Kamp Hilde Johanna · Director
Tx Jan 7·Filed Jan 9·EDGAR ↗
3,400 sh
AWARD
Gulfo Adele M. · Director
Tx Jan 7·Filed Jan 9·EDGAR ↗
3,400 sh
SELL10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Jan 7·Filed Jan 9·EDGAR ↗
11,582 sh
AWARD10b5-1
Davidson Michael H. · Chief Executive Officer
Tx Jan 7·Filed Jan 9·EDGAR ↗
81,000 sh
AWARD
Lewis William · Director
Tx Jan 7·Filed Jan 9·EDGAR ↗
3,400 sh
AWARD
Smither John W · Director
Tx Jan 7·Filed Jan 9·EDGAR ↗
3,400 sh
AWARD10b5-1
Kastelein Johannes Jacob Pieter · Chief Scientific Officer
Tx Jan 7·Filed Jan 7·EDGAR ↗
25,500 sh

Track every ticker you care about

Free plan includes 3 tickers, daily insider scans, and cluster alerts. No credit card.

Start free (3 tickers)See plans

Join investors tracking SEC filings.

About NAMS insider trading data

Form 4 is the SEC filing required when an officer, director, or 10% owner of a public company buys or sells the company's stock. By law, these filings must be submitted within two business days of the trade. Tracenotes pulls every Form 4 filing for NAMS from EDGAR, parses it, and surfaces the activity on this page.

What insider buying tells you. Open-market purchases by insiders are widely studied as a meaningful signal. Unlike stock awards (which are compensation, not conviction), an executive spending their own money to buy shares of the company they run is a vote of confidence. Studies have found insider-buying clusters — three or more insiders buying within a short window — outperform the broader market over the following year.

What insider selling tells you. Selling is noisier. Many sales are pre-scheduled under SEC Rule 10b5-1 plans, which let insiders sell on a fixed schedule regardless of company news. We label these "10b5-1" so you can see them. Discretionary sales — sales not tied to a plan — are more meaningful, especially when multiple insiders sell in quick succession.

Tracenotes methodology. We scan EDGAR daily for new Form 4 filings, parse them into individual transactions, and detect clusters when three or more distinct insiders buy or sell within a 14-day window. The data on this page covers the last 12 months. For deeper analysis, Tracenotes also runs language-change detection on 10-K and 10-Q filings — that's our core product.

See this for every ticker.

Tracenotes covers the S&P 500 and beyond. Pick any ticker — get the same depth of insider trading data.

AAPLNVDAMSFTTSLA

Free plan available — no credit card. Sign up free →

Frequently asked questions

What is a Form 4 filing?

Form 4 is the SEC disclosure required when a company insider — an officer, director, or 10% owner — buys or sells the company's stock. By law these filings must be submitted within two business days of the trade.

Is insider buying NAMS always bullish?

Open-market purchases by insiders are widely viewed as a bullish signal because executives are spending their own money. Stock awards and option exercises are part of compensation and don't carry the same weight, which is why we treat them separately on this page.

What is a 10b5-1 trade?

A trade made under SEC Rule 10b5-1, which lets insiders pre-schedule sales weeks or months in advance. These sales execute on a fixed plan regardless of company news, so they're a weaker signal than discretionary sales. We label them with a "10b5-1" tag.

What is an insider cluster?

A cluster is when three or more distinct insiders buy or sell within a 14-day window. Clusters are studied as stronger signals than single trades because multiple people independently reach the same view. We surface active clusters on NewAmsterdam Pharma Co N.V. (NAMS) when they form.

Where does NAMS insider trading data come from?

Every Form 4 filing for NAMS is sourced directly from SEC EDGAR. Tracenotes scans EDGAR daily, parses each Form 4 into individual transactions, and updates this page within hours of new filings.

Other tickers with active clusters

Insider clusters detected elsewhere in the last 30 days.

JPMSELLING
$55.3M
8 insiders

Nothing on this page constitutes investment advice. Form 4 data is sourced from SEC EDGAR and provided for research purposes only.

© 2026 Tracenotes · tracenotes.ai