Kooij Louise Frederika

Track record

How each disclosed position did against the S&P ~6 months later

No positions we can measure against the market yet — outcomes appear once a disclosed buy is ~6 months old.

Disclosed positions

Estimated from their latest filings — positions may have changed since

Estimated positions from their latest filingsPro →

Activity

Open-market buy & sell volume

BuySell

Total +$0.0000 bought · −$16.89M sold

All filings on record

Every Form 4 transaction we track for this filer

All10Buys0Sells5

Stock	Transaction	Date	~6mo vs S&P
NAMSWNewAmsterdam Pharma Co N.V.	Sell $2.32M · 65,000 sh	2026-05-26	—
NAMSWNewAmsterdam Pharma Co N.V.	Exercise $54.5K · 5,000 sh	2026-05-26	—
NAMSWNewAmsterdam Pharma Co N.V.	Exercise $600.0K · 60,000 sh	2026-05-26	—
NAMSWNewAmsterdam Pharma Co N.V.	Sell $1.04M · 32,612 sh	2026-01-28	—
NAMSWNewAmsterdam Pharma Co N.V.	Exercise $355.5K · 32,612 sh	2026-01-28	—
NAMSWNewAmsterdam Pharma Co N.V.	Sell $1.30M · 39,816 sh	2026-01-27	—
NAMSWNewAmsterdam Pharma Co N.V.	Exercise $434.0K · 39,816 sh	2026-01-27	—
NAMSWNewAmsterdam Pharma Co N.V.	Sell $10.3K · 309 sh	2026-01-26	—
NAMSWNewAmsterdam Pharma Co N.V.	Sell $1.12M · 34,091 sh	2026-01-26	—
NAMSWNewAmsterdam Pharma Co N.V.	Exercise $375.0K · 34,400 sh	2026-01-26	—

NAMSWSell

2026-05-26 · NewAmsterdam Pharma Co N.V.

$2.32M

—

NAMSWExercise

2026-05-26 · NewAmsterdam Pharma Co N.V.

$54.5K

—

NAMSWExercise

2026-05-26 · NewAmsterdam Pharma Co N.V.

$600.0K

—

NAMSWSell

2026-01-28 · NewAmsterdam Pharma Co N.V.

$1.04M

—

NAMSWExercise

2026-01-28 · NewAmsterdam Pharma Co N.V.

$355.5K

—

NAMSWSell

2026-01-27 · NewAmsterdam Pharma Co N.V.

$1.30M

—

NAMSWExercise

2026-01-27 · NewAmsterdam Pharma Co N.V.

$434.0K

—

NAMSWSell

2026-01-26 · NewAmsterdam Pharma Co N.V.

$10.3K

—

NAMSWSell

2026-01-26 · NewAmsterdam Pharma Co N.V.

$1.12M

—

NAMSWExercise

2026-01-26 · NewAmsterdam Pharma Co N.V.

$375.0K

—

Newest 10 of 28 filings·Every Form 4 on record, with outcomesPro →

Filing in the same companies

Other insiders active in these names in the last 3 years

DM

Davidson Michael H.

NAMSW · last 2026-03-02

KJ

Kastelein Johannes Jacob Pieter

NAMSW · last 2026-02-20

SM

Somaiya Mayur Ian

NAMSW · last 2026-01-21

GA

Gulfo Adele M.

NAMSW · last 2026-01-07

LL

Lange Louis G

NAMSW · last 2026-01-07

LW

Lewis William

NAMSW · last 2026-01-07

Outcomes measure each position — the first buy in a stock and every buy within 182 days — against the closing price ~6 months (120 trading days) later, with the S&P 500 over the same span for context. Pre-scheduled 10b5-1 plan trades are excluded from the record. Positions are estimated from the latest reported post-transaction holdings, split-adjusted, at the latest close. Built from SEC Form 4 filings and market prices — past outcomes, not predictions or advice.