Karen Firestone insider trades: Amylyx Pharmaceuticals (AMLX) stock purchases
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Karen reports to the SEC
Open-market buys and sales
5 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| May 21, 2026 | AMLX | ↑ Buy | 3,800 | $13.51 | $51K | Direct | May 26, 2026 (5d) |
| Dec 23, 2025 | AMLX | ↑ Buy | 8,100 | $12.45 | $101K | Direct | Dec 23, 2025 (0d) |
| Sep 5, 2024 | AMLX | ↑ Buy | 50,000 | $2.13 | $107K | Direct | Sep 9, 2024 (4d) |
| Dec 15, 2023 | AMLX | ↑ Buy | 4,000 | $14.97 | $60K | Direct | Dec 19, 2023 (4d) |
| Mar 16, 2023 | AMLX | ↑ Buy | 1,000 | $31.99 | $32K | Direct | Mar 20, 2023 (4d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other AMLX insiders
Open-market trades in the last 12 months
About Karen Firestone's insider trades
Karen Firestone is an insider at Amylyx Pharmaceuticals (AMLX). Since Mar 16, 2023, Karen has reported 5 open-market purchases worth $351K and no sales on SEC Form 4. In the last 12 months: 2 buys ($152K).
Their filings also include grants and awards (5 filings), option exercises (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every AMLX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.