Quick Takeaways
- Karen Firestone has 1 issuer position tracked on this page.
- Estimated disclosed ownership value: $785,595.
- Recent insider filing activity is available below.
Insider Trading & Ownership of Karen Firestone
- Location
- Cambridge, MA
- Summary
- The estimated net worth of Karen Firestone is at least $785,595 dollars as of 23 Dec 2025. Karen Firestone is the Director of Amylyx Pharmaceuticals, Inc. and owns shares of Amylyx Pharmaceuticals, Inc. (AMLX) stock worth about $785.6K.
- Signature
- /s/ Joshua B. Cohen, as Attorney in Fact
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Karen Firestone and return when a new Insider Trading filing changes the record on this page.
This uses the existing product follow flow to surface future filing-backed changes without guessing what they mean.
What Changed
- Largest disclosed position: Amylyx Pharmaceuticals, Inc. ($785,595).
- Past-year value change for that position: +$100,845.
Why This Matters
- This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
- You can cross-check role, issuer, and filing chronology directly against the SEC source.
Source Evidence
Filed on Form 4
See Original Filing
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
Ownership of Karen Firestone
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| AMLX | Amylyx Pharmaceuticals, Inc. | Director | $785,595 | +$100,845 | +15% | 23 Dec 2025 |
Insider Transactions Reported by Karen Firestone:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.