Amylyx (AMLX) director Karen Firestone receives 24,372 stock options grant

Rhea-AI Filing Summary

Amylyx Pharmaceuticals director Karen Firestone received a grant of stock options covering 24,372 shares of common stock at an exercise price of $14.31 per share. These options vest in full on the earlier of June 4, 2027 or the next annual meeting, provided she remains in continuous service, and bring her directly held option position reported in this filing to 24,372 shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Firestone Karen

Role null

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy)	24,372	$0.00	--

Holdings After Transaction: Stock Option (right to buy) — 24,372 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Option grant size: 24,372 shares Exercise price: $14.31 per share Post-grant options held: 24,372 options +2 more

5 metrics

Option grant size 24,372 shares Stock Option (right to buy) granted to director

Exercise price $14.31 per share Conversion or exercise price of stock option

Post-grant options held 24,372 options Total shares following transaction, direct ownership

Option expiration June 3, 2036 Expiration date of the stock option grant

Underlying shares 24,372 common shares Underlying Amylyx common stock for the option

Key Terms

Stock Option (right to buy), Common Stock, exercise price, expiration date, +1 more

5 terms

Stock Option (right to buy) financial

"security_title: "Stock Option (right to buy)""

Common Stock financial

"underlying_security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

exercise price financial

"conversion_or_exercise_price: "14.3100""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

expiration date financial

"expiration_date: "2036-06-03T00:00:00.000Z""

The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.

vest in full financial

"The shares subject to this option shall vest in full upon the earlier of"

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Firestone Karen

(Last) (First) (Middle)

C/O AMYLYX PHARMACEUTICALS, INC.

55 CAMBRIDGE PARKWAY, SUITE 6W

(Street)

CAMBRIDGE MASSACHUSETTS 02142

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Amylyx Pharmaceuticals, Inc. [ AMLX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$14.31	06/04/2026		A		24,372		(1)	06/03/2036	Common Stock	24,372	$0	24,372	D

Explanation of Responses:

1. The shares subject to this option shall vest in full upon the earlier of (i) June 4, 2027 or (ii) the date of the next annual meeting, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

	/s/ Joshua B. Cohen, as Attorney in Fact	06/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Amylyx Pharmaceuticals (AMLX) director Karen Firestone report on this Form 4?

Karen Firestone reported receiving a grant of stock options for 24,372 Amylyx common shares. The options were awarded at an exercise price of $14.31 per share as compensation, not through an open-market stock purchase or sale.

What is the size and exercise price of the Amylyx (AMLX) stock options granted to Karen Firestone?

The grant covers 24,372 shares of Amylyx common stock with an exercise price of $14.31 per share. This means she can buy those shares at $14.31 once the options vest, regardless of the future market price.

When do Karen Firestone’s Amylyx (AMLX) stock options vest?

The options vest in full on the earlier of June 4, 2027 or the date of the next annual meeting. Vesting is conditioned on her continuous service with Amylyx through that vesting date, according to the filing footnote.

How many Amylyx (AMLX) options does Karen Firestone hold after this transaction?

After this grant, the Form 4 shows Karen Firestone holding 24,372 stock options directly. These options are all tied to Amylyx common stock and reflect compensation-based equity rather than shares acquired on the open market.

Is Karen Firestone’s Amylyx (AMLX) Form 4 transaction a stock purchase or sale?

The transaction is a grant of stock options, not a market trade. The Form 4 uses code “A” for a grant, award, or other acquisition, meaning she received options as compensation instead of buying or selling existing shares.