Kooij Louise Frederika — Insider Trades & Holdings | InsiderBid

Kooij Louise Frederika

Form 4 filings across 1 company. Net figures count open-market buys and sales only. EDGAR profile ↗

Lifetime net: -$21.3M

Positions by company

Reported holding is the most recent post-transaction share count on a Table I row.

Every company this insider has reported trading in, with the value bought and sold at each and the date they last traded.
Ticker	Company	Bought	Sold	Net	Shares held	Last trade
NAMS	NewAmsterdam Pharma Co N.V.	$0	$21.3M	-$21.3M	24,353	Jul 20

NewAmsterdam Pharma Co N.V.

-$21.3M

Bought

$0

Sold

$21.3M

Held

24,353

Filing record

How quickly this filer reports. Section 16 allows two business days from the transaction.

All 11 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Trade history

The 54 most recent Form 4 transactions.

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Ticker	Company	Type	Shares	Price	Value	Δ Own	Filing
Jul 20	NAMS	NewAmsterdam Pharma Co…	MEXER◷◆	80,000	—	—	—	Open the original filing on SEC.gov
Jul 20	NAMS	NewAmsterdam Pharma Co…	MEXER◷◆

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jul 20

80,000 sh

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jul 20

25,000 sh

NAMSSSELL◷$92.4K

NewAmsterdam Pharma Co N.V.Jul 20

2,915 sh @ $31.71 · -10.7% own

NAMSSSELL◷$990K

NewAmsterdam Pharma Co N.V.Jul 20

31,885 sh @ $31.05 · -53.9% own

NAMSSSELL◷$2.1M

NewAmsterdam Pharma Co N.V.Jul 20

70,200 sh @ $29.96 · -54.3% own

NAMSMEXER◷$893.6K

NewAmsterdam Pharma Co N.V.Jul 20

80,000 sh @ $11.17 · +162.1% own

NAMSMEXER◷$297.5K

NewAmsterdam Pharma Co N.V.Jul 20

25,000 sh @ $11.90 · +102.7% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jun 22

15,000 sh

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jun 22

25,000 sh

NAMSSSELL◷$9.2K

NewAmsterdam Pharma Co N.V.Jun 22

300 sh @ $30.73 · -1.2% own

NAMSSSELL◷$1.2M

NewAmsterdam Pharma Co N.V.Jun 22

39,700 sh @ $30.20 · -61.7% own

NAMSMEXER◷$178.5K

NewAmsterdam Pharma Co N.V.Jun 22

15,000 sh @ $11.90 · +30.4% own

NAMSMEXER◷$272.5K

NewAmsterdam Pharma Co N.V.Jun 22

25,000 sh @ $10.90 · +102.7% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.May 26

5,000 sh

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.May 26

60,000 sh

NAMSSSELL◷$2.3M

NewAmsterdam Pharma Co N.V.May 26

65,000 sh @ $35.69 · -72.8% own

NAMSMEXER◷$54.5K

NewAmsterdam Pharma Co N.V.May 26

5,000 sh @ $10.90 · +5.9% own

NAMSMEXER◷$600K

NewAmsterdam Pharma Co N.V.May 26

60,000 sh @ $10.00 · +246.4% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jan 28

32,612 sh

NAMSSSELL◷$1M

NewAmsterdam Pharma Co N.V.Jan 28

32,612 sh @ $31.80 · -57.3% own

NAMSMEXER◷$355.5K

NewAmsterdam Pharma Co N.V.Jan 28

32,612 sh @ $10.90 · +133.9% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jan 27

39,816 sh

NAMSSSELL◷$1.3M

NewAmsterdam Pharma Co N.V.Jan 27

39,816 sh @ $32.62 · -62.1% own

NAMSMEXER◷$434K

NewAmsterdam Pharma Co N.V.Jan 27

39,816 sh @ $10.90 · +163.5% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jan 26

34,400 sh

NAMSSSELL◷$10.3K

NewAmsterdam Pharma Co N.V.Jan 26

309 sh @ $33.45 · -1.3% own

NAMSSSELL◷$1.1M

NewAmsterdam Pharma Co N.V.Jan 26

34,091 sh @ $32.77 · -58.0% own

NAMSMEXER◷$375K

NewAmsterdam Pharma Co N.V.Jan 26

34,400 sh @ $10.90 · +141.3% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Jan 23

38,172 sh

NAMSSSELL◷$438.8K

NewAmsterdam Pharma Co N.V.Jan 23

12,767 sh @ $34.37 · -34.4% own

NAMSSSELL◷$849.5K

NewAmsterdam Pharma Co N.V.Jan 23

25,405 sh @ $33.44 · -40.6% own

NAMSMEXER◷$416.1K

NewAmsterdam Pharma Co N.V.Jan 23

38,172 sh @ $10.90 · +156.7% own

NAMSAGRANT◷◆—

NewAmsterdam Pharma Co N.V.Jan 7

53,500 sh

NAMSAGRANT◷—

NewAmsterdam Pharma Co N.V.Jan 7

12,000 sh · +97.1% own

NAMSSSELL◷$88K

NewAmsterdam Pharma Co N.V.Jan 5

2,647 sh @ $33.25 · -17.6% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Dec 26, 2025

5,000 sh

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Dec 26, 2025

38,872 sh

NAMSSSELL◷$1.5M

NewAmsterdam Pharma Co N.V.Dec 26, 2025

43,872 sh @ $35.30 · -74.5% own

NAMSMEXER◷$54.5K

NewAmsterdam Pharma Co N.V.Dec 26, 2025

5,000 sh @ $10.90 · +9.3% own

NAMSMEXER◷$388.7K

NewAmsterdam Pharma Co N.V.Dec 26, 2025

38,872 sh @ $10.00 · +259.1% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Dec 24, 2025

26,011 sh

NAMSSSELL◷$928.1K

NewAmsterdam Pharma Co N.V.Dec 24, 2025

26,011 sh @ $35.68 · -63.4% own

NAMSMEXER◷$260.1K

NewAmsterdam Pharma Co N.V.Dec 24, 2025

26,011 sh @ $10.00 · +173.4% own

NAMSMEXER◷◆—

NewAmsterdam Pharma Co N.V.Dec 23, 2025

75,117 sh

NAMSSSELL◷$2.7M

NewAmsterdam Pharma Co N.V.Dec 23, 2025

75,117 sh @ $36.21 · -83.4% own

NAMSMEXER◷$751.2K

NewAmsterdam Pharma Co N.V.Dec 23, 2025

75,117 sh @ $10.00 · +500.8% own

NAMSMEXER◆—

NewAmsterdam Pharma Co N.V.Sep 9, 2025

150,000 sh

NAMSSSELL$2.5M

NewAmsterdam Pharma Co N.V.Sep 9, 2025

96,896 sh @ $26.11 · -86.6% own

NAMSSSELL$1.3M

NewAmsterdam Pharma Co N.V.Sep 9, 2025

53,104 sh @ $25.31 · -32.2% own

NAMSMEXER$1.5M

NewAmsterdam Pharma Co N.V.Sep 9, 2025

150,000 sh @ $10.00 · +1,000% own

NAMSSSELL$453.5K

NewAmsterdam Pharma Co N.V.Sep 3, 2025

18,073 sh @ $25.09 · -54.6% own

NAMSMEXER◆—

NewAmsterdam Pharma Co N.V.Sep 2, 2025

18,073 sh

NAMSMEXER—

NewAmsterdam Pharma Co N.V.Sep 2, 2025

18,073 sh · +120.5% own

NAMSSSELL$205.6K

NewAmsterdam Pharma Co N.V.Aug 25, 2025

8,269 sh @ $24.86 · -35.5% own