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Louise Frederika Kooij

NAMS
CHIEF ACCOUNTING OFFICER · NEWAMSTERDAM PHARMA CO N.V. · CIK 0002004379
FILING MIX · LIFETIME39%/61%
BUYS
23
SELLS
36
TOTAL VALUE
$27.50M
COMPANIES
1
ACTIVE SINCE
Jan 2024
HOLDINGS NOW
43,134
AVG SELL PX
$28.43
TRADE KIND
SHOWING 59 / 59
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
16 backtested trades · 8 horizons · 36 pending
Forward-return performance of every backtestable P/S trade by Louise Frederika Kooij, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d16+68.75%-1.24%-0.05%-1.19%-1.62%—
14d16+31.25%+2.83%+0.37%+2.47%+1.66%—
30d16+37.50%+5.76%+0.16%+5.60%+7.02%—
60d16+56.25%+7.43%-1.66%+9.09%+1.10%—
90d16+62.50%+8.55%+1.46%+7.09%-8.37%—
180d16(6 pending)+30.00%+9.73%+6.50%+3.24%+5.54%—
1y16(14 pending)+0.00%+57.42%+18.72%+38.70%+38.70%—
2y16(16 pending)——————
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
NAMS · 43,134 shares · as of Jun 22, 2026
070,004140,008210,011280,015202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 23 buys / 36 sellsCOVERAGE · 10 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
39,700$30.20$1.20M24,653Jun 22, 2026Jun 24, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
25,000——43,134Jun 22, 2026Jun 24, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
25,000$10.90$272.5K49,353Jun 22, 2026Jun 24, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
15,000——35,000Jun 22, 2026Jun 24, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
300$30.73$9.2K24,353Jun 22, 2026Jun 24, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
15,000$11.90$178.5K64,353Jun 22, 2026Jun 24, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
65,000$35.69$2.32M24,353May 26, 2026May 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
60,000$10.00$600.0K84,353May 26, 2026May 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
5,000$10.90$54.5K89,353May 26, 2026May 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
5,000——68,134May 26, 2026May 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
60,000——80,015May 26, 2026May 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
32,612——73,134Jan 28, 2026Jan 29, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
32,612$31.80$1.04M24,353Jan 28, 2026Jan 29, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
32,612$10.90$355.5K56,965Jan 28, 2026Jan 29, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
39,816$32.62$1.30M24,353Jan 27, 2026Jan 29, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
39,816——105,746Jan 27, 2026Jan 29, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
39,816$10.90$434.0K64,169Jan 27, 2026Jan 29, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
34,400——145,562Jan 26, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
34,400$10.90$375.0K58,753Jan 26, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
309$33.45$10.3K24,353Jan 26, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
34,091$32.77$1.12M24,662Jan 26, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
25,405$33.44$849.5K37,120Jan 23, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
38,172$10.90$416.1K62,525Jan 23, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
12,767$34.37$438.8K24,353Jan 23, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
38,172——179,962Jan 23, 2026Jan 27, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASEGRANT
Stock grant
12,000——24,353Jan 7, 2026Jan 7, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASEGRANT
Stock grant
53,500——53,500Jan 7, 2026Jan 7, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
2,647$33.25$88.0K12,353Jan 5, 2026Jan 7, 2026 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
38,872——140,015Dec 26, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
38,872$10.00$388.7K53,872Dec 26, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
5,000$10.90$54.5K58,872Dec 26, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
5,000——218,134Dec 26, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
43,872$35.30$1.55M15,000Dec 26, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
26,011$10.00$260.1K41,011Dec 24, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
26,011——178,887Dec 24, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
26,011$35.68$928.1K15,000Dec 24, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
75,117——204,898Dec 23, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
75,117$10.00$751.2K90,117Dec 23, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE10b5-1
10b5-1 plan
75,117$36.21$2.72M15,000Dec 23, 2025Dec 29, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
53,104$25.31$1.34M111,896Sep 9, 2025Sep 10, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
96,896$26.11$2.53M15,000Sep 9, 2025Sep 10, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
150,000$10.00$1.50M165,000Sep 9, 2025Sep 10, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
150,000——280,015Sep 9, 2025Sep 10, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
18,073$25.09$453.5K15,000Sep 3, 2025Sep 5, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
18,073——33,073Sep 2, 2025Sep 4, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
18,073——0Sep 2, 2025Sep 4, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
8,269$24.86$205.6K15,000Aug 25, 2025Aug 27, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASEGRANT
Stock grant
8,269——8,269Mar 26, 2025Mar 28, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
8,269——0Mar 26, 2025Mar 28, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
8,269——23,269Mar 26, 2025Mar 28, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
150,000$20.37$3.06M15,000Mar 4, 2025Mar 5, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
150,000——165,000Mar 4, 2025Mar 5, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
150,000——18,073Mar 4, 2025Mar 5, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASEGRANT
Stock grant
15,000——15,000Jan 7, 2025Jan 7, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASEGRANT
Stock grant
80,000——80,000Jan 2, 2025Jan 6, 2025 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
45,000$15.72$707.4K0Oct 1, 2024Oct 1, 2024 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASE
Chief Accounting Officer
45,000——45,000Sep 27, 2024Oct 1, 2024 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
SALE
Chief Accounting Officer
45,000——168,073Sep 27, 2024Oct 1, 2024 ↗View →
NAMS
NEWAMSTERDAM PHARMA CO N.V.
PURCHASEGRANT
Stock grant
150,494——150,494Jan 1, 2024Jan 3, 2024 ↗View →
Other insiders · NAMS
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About this filer
CIK 0002004379
ROLE
Chief Accounting Officer
PRIMARY
NAMS
COMPANIES
1
ACTIVE SINCE
Jan 2024
MARKETPEEL · /INSIDER/0002004379DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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