Insider trades › Louise Frederika Kooij
Louise Frederika Kooij
A corporate insider: an officer, director or owner of more than 10% of a company. Insiders report their trades to the SEC on Form 4The form insiders use to report each purchase or sale of their company's stock. It is due within two business days of the trade. · Last filing Jul 22, 2026
Ask your AI about this
Connect Claude, ChatGPT, Gemini or Grok (Microsoft 365 Copilot coming soon) to 13F.ai and ask in plain English. Copy a question to get started:
Using 13F.ai, list Louise Frederika Kooij's open-market buys and sells across companies in the last two years, with the Form 4 links.
Using 13F.ai, how did the stocks Louise Frederika Kooij bought perform after the purchase compared with the S&P 500?
Using 13F.ai, are other insiders at the same companies buying or selling at the same time as Louise Frederika Kooij?
Connect your AI · Plans and the 7-day free trial (card required)
Buying and selling by quarter
Dollars bought and sold on the open market over the last two years.
Bought Sold
By trade date, using the shares and price reported for each trade. Stock grants, option exercises and shares withheld for tax are left out.
Roles
The companies where this person reports as an insider, and their position at each, most recent first.
| Company | Role | Last filed |
|---|---|---|
| NAMS NewAmsterdam Pharma Company N.V. | Chief Accounting Officer | Jul 22, 2026 |
Roles come from the filings themselves and can change over time.
Latest open-market trades
Purchases and sales at every company, most recent filing first.
| How the stock has done since the trade date, measured against the S&P 500 over the same days. It describes the stock, not the trader's actual gain or loss. | Filing | ||||||
|---|---|---|---|---|---|---|---|
| Jul 20, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 31,885 | $31.05 | $990.0K | -33.8% | Form 4 ↗ |
| Jul 20, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 70,200 | $29.96 | $2.1M | -33.8% | Form 4 ↗ |
| Jul 20, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 2,915 | $31.71 | $92.4K | -33.8% | Form 4 ↗ |
| Jun 22, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 300 | $30.73 | $9,219 | -36.0% | Form 4 ↗ |
| Jun 22, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 39,700 | $30.20 | $1.2M | -36.0% | Form 4 ↗ |
| May 26, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 65,000 | $35.69 | $2.3M | -44.7% | Form 4 ↗ |
| Jan 28, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 32,612 | $31.80 | $1.0M | -45.3% | Form 4 ↗ |
| Jan 27, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 39,816 | $32.62 | $1.3M | -46.7% | Form 4 ↗ |
| Jan 26, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 309 | $33.45 | $10.3K | -46.7% | Form 4 ↗ |
| Jan 26, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 34,091 | $32.77 | $1.1M | -46.7% | Form 4 ↗ |
| Jan 23, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 12,767 | $34.37 | $438.8K | -49.0% | Form 4 ↗ |
| Jan 23, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 25,405 | $33.44 | $849.5K | -49.0% | Form 4 ↗ |
| Jan 5, 2026 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 2,647 | $33.25 | $88.0K | -49.5% | Form 4 ↗ |
| Dec 26, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 43,872 | $35.30 | $1.5M | -52.2% | Form 4 ↗ |
| Dec 24, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 26,011 | $35.68 | $928.1K | -52.8% | Form 4 ↗ |
| Dec 23, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 75,117 | $36.21 | $2.7M | -53.6% | Form 4 ↗ |
| Sep 9, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 53,104 | $25.31 | $1.3M | -40.3% | Form 4 ↗ |
| Sep 9, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 96,896 | $26.11 | $2.5M | -40.3% | Form 4 ↗ |
| Sep 3, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 18,073 | $25.09 | $453.5K | -36.2% | Form 4 ↗ |
| Aug 25, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 8,269 | $24.86 | $205.6K | -35.9% | Form 4 ↗ |
| Mar 4, 2025 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 150,000 | $20.37 | $3.1M | -37.1% | Form 4 ↗ |
| Oct 1, 2024 | NAMS NewAmsterdam Pharma Company N.V. | Sale | 45,000 | $15.72 | $707.4K | -16.2% | Form 4 ↗ |
Each row links to its Form 4. Since trade compares the stock’s move from the close on the trade date (or the next trading day) to its latest close with the S&P 500 over the same days, adjusted for splits and excluding dividends. It describes the stock, not what the trader made: we don’t know their purchase price, position size or later sales. A dash means the trade isn’t matched to a listed stock, or there is no closing price after it yet.
When several people report on the same filing, we list it under the first one named, so trades by someone usually listed second may be missing here. Information, not investment advice: see the disclaimer.