Alkermes executive Gaffin sells 2,035 shares

The sale by the EVP, CLO of Alkermes, Inc. was effected pursuant to a Rule 10b5-1 plan adopted on November 19, 2025.

Available on EDGAR 11/03/2026 - 07:18 PM EST Accepted by SEC EDGAR 11/03/2026 - 07:18 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Alkermes plc. reported a sale by David Joseph Gaffin, EVP, CLO of Alkermes, Inc.: 2,035 Ordinary Shares at $46.17 per share on November 3, 2026. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted on November 19, 2025. Gaffin directly held 219,353 shares after the transaction. The transaction description characterizes it as a sale in the open market or a private transaction.

Insider Trade Summary 10b5-1

Net Seller: 2,035 shares

Net Sell 1 txn

Insider Gaffin David Joseph

Role EVP, CLO, Alkermes, Inc.

Sold 2,035 shs ($94K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1	2,035	$46.17	$94K

Holdings After Transaction: Ordinary Shares — 219,353 shares (Direct)

Footnotes (1)

1. F1. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 11/19/2025.

Key Figures

Ordinary Shares Sold: 2,035 shares Sale Price: $46.17 per share Direct Shares Following Sale: 219,353 shares

3 metrics

Ordinary Shares Sold 2,035 shares Sale on November 3, 2026

Sale Price $46.17 per share Sale on November 3, 2026

Direct Shares Following Sale 219,353 shares After the November 3, 2026 transaction

Key Terms

Rule 10b5-1 trading plan, Ordinary Shares, sale in open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Ordinary Shares financial

"2,035 Ordinary Shares"

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

sale in open market or private transaction financial

"Sale in open market or private transaction"

FAQ

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How many ALKS shares did David Joseph Gaffin sell, and at what price?

David Joseph Gaffin sold 2,035 Ordinary Shares at $46.17 per share on November 3, 2026. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted on November 19, 2025; he directly held 219,353 shares after the transaction.

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

Form 4 Insider Transactions: What Each Field Means →

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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).

X

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^*

Gaffin David Joseph

(Last) (First) (Middle)

900 WINTER STREET

(Street)

WALTHAM MASSACHUSETTS 02451

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Alkermes plc. [ ALKS ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, CLO, Alkermes, Inc.

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/03/2026

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
Ordinary Shares	11/03/2026		S(1)		2,035	D	$46.17	219,353	D

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

Explanation of Responses:

1. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 11/19/2025.

	/s/ Shantale Greenson, attorney-in-fact for David Joseph Gaffin	11/03/2026
	** 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)