Key facts
- This page summarizes Karen Firestone's Form 4 filing for Amylyx Pharmaceuticals, Inc. (AMLX).
- 3 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 02 Sep 2026, 16:00.
Karen Firestone - 31 Aug 2026 Form 4 Insider Report for Amylyx Pharmaceuticals, Inc. (AMLX)
- Reporting relationship
- Director
- Issuer ticker
- AMLX
- Reported as of
- 31 Aug 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 02 Sep 2026, 16:00:27 UTC
- Prior SEC filing
- 08 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Joshua B. Cohen, as Attorney in Fact
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Karen Firestone filed Form 4 for Amylyx Pharmaceuticals, Inc. (AMLX) on 02 Sep 2026.
Change
- Previous filing in this sequence was filed on 08 Jun 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001969821
Primary reporting owner
Firestone Karen
- Relationship
- Director
- Address
- C/O AMYLYX PHARMACEUTICALS, INC., 55 CAMBRIDGE PARKWAY, SUITE 6W, CAMBRIDGE
- Signature
- /s/ Joshua B. Cohen, as Attorney in Fact
- Signature date
- 02 Sep 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
AMLX
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +25,000
- Change %
- +37%
- Price
- $1.76*
- Shares after
- 91,900
- Date
- 31 Aug 2026
- Ownership
- Direct
AMLX
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +25,000
- Change %
- +27%
- Price
- $5.05*
- Shares after
- 116,900
- Date
- 31 Aug 2026
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
AMLX
transaction
Derivative
Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -25,000
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 31 Aug 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 25,000
- Exercise price
- $1.76
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote F1
This option is fully vested and exercisable.