AMLX insider files Form 144 to sell 57,529 shares

Justin B. Klee filed a Form 144 proposing the sale of 57,529 common shares tied to the vesting of restricted stock units through Morgan Stanley Smith Barney LLC on 03/02/2026.

Accepted by SEC EDGAR 03/02/2026 - 04:30 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Justin B. Klee filed a Form 144 proposing the sale of 57,529 common shares tied to the vesting of restricted stock units through Morgan Stanley Smith Barney LLC on 03/02/2026. The filing lists prior open‑market sales by Mr. Klee in January–February 2026, including sales of 136,193 shares on 01/15/2026 and 15,500 shares on 02/02/2026.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did the AMLX Form 144 disclose?

The Form 144 discloses a proposed sale of 57,529 common shares tied to RSU vesting through Morgan Stanley Smith Barney LLC on 03/02/2026. It also lists prior insider sales in January–February 2026 by Justin B. Klee.

Who is the reporting insider on the AMLX Form 144?

The reporting person is Justin B. Klee, with address information shown. The filing lists sales and the proposed transaction executed via Morgan Stanley Smith Barney LLC on 03/02/2026.

How many shares are proposed for sale in the AMLX filing?

The filing proposes the sale of 57,529 common shares associated with the vesting of restricted stock units on 03/02/2026. The transaction is presented as a brokered sale through Morgan Stanley Smith Barney LLC.

Does the Form 144 show recent insider sales for AMLX?

Yes; the filing lists prior sales by Justin B. Klee, including a sale of 136,193 shares on 01/15/2026 and a sale of 15,500 shares on 02/02/2026, among other January 2026 transactions.

Which broker is handling the proposed AMLX sale?

The proposed sale is listed as handled by Morgan Stanley Smith Barney LLC at 1 New York Plaza, with the transaction date shown as 03/02/2026 in the filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001898314
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Amylyx Pharmaceuticals, Inc.
SEC File Number	001-41199
Address of Issuer	55 Cambridge Parkway Suite 6W Cambridge MASSACHUSETTS 02142
Phone	617-682-0917
Name of Person for Whose Account the Securities are To Be Sold	Klee Justin B.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC 1 New York Plaza 8th Floor New York NY 10004	29282	423760	3334616	03/02/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/02/2026	Vesting of Restricted Stock Units	Issuer			57529	03/02/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Klee Justin B. 55 Cambridge Parkway Suite 6W Cambridge MA 02142	Common	01/16/2026	1995	27701
Klee Justin B. 55 Cambridge Parkway Suite 6W Cambridge MA 02142	Common	01/15/2026	136193	1849869
Klee Justin B. 55 Cambridge Parkway Suite 6W Cambridge MA 02142	Common	01/06/2026	7715	85590
Klee Justin B. 55 Cambridge Parkway Suite 6W Cambridge MA 02142	Common	02/02/2026	15500	227617

144: Remarks and Signature

Remarks	This sale represents shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. Such sales were automatic and not at the discretion of the Reporting Person.
Date of Notice	03/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Joshua B. Cohen, as Attorney in Fact
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)