Alkermes (ALKS) EVP Gaffin exercises RSUs, withholds 3,049 shares for tax

Rhea-AI Filing Summary

Alkermes plc executive David Joseph Gaffin reported equity award activity. On 2/26/2026, he acquired 6,866 restricted stock units and 6,866 ordinary shares through an exercise or conversion of derivative securities. A separate transaction disposed of 3,049 ordinary shares at $30.73 per share to satisfy tax obligations.

After these transactions, Gaffin directly held 13,732 restricted stock units and 239,694 ordinary shares. Each restricted stock unit represents a contingent right to receive one ordinary share, and the award vests in four equal annual installments beginning on 2/26/2025.

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
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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^*

Gaffin David Joseph

(Last) (First) (Middle)

900 WINTER STREET

(Street)

WALTHAM MA 02451

(City) (State) (Zip)

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.

3. Date of Earliest Transaction (Month/Day/Year)
02/26/2026

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

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

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

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	02/26/2026		M		6,866	A	(1)	242,743	D
Ordinary Shares	02/26/2026		F		3,049	D	$30.73	239,694	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
Restricted Stock Unit Award	(1)	02/26/2026		M			6,866	(2)	(2)	Ordinary Shares	6,866	(1)	13,732	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one ordinary share.

2. Shares subject to the restricted stock unit award vest in four equal annual installments, commencing on 2/26/2025.

	/s/ Shantale Greenson, attorney-in-fact for David Joseph Gaffin	02/27/2026
	** 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.

FAQ

What insider transactions did Alkermes (ALKS) executive David Joseph Gaffin report?

David Joseph Gaffin reported acquiring 6,866 restricted stock units and 6,866 ordinary shares through a derivative exercise, and disposing of 3,049 ordinary shares to cover tax obligations. All positions are held directly in Alkermes equity as of the reported date.

How many Alkermes (ALKS) shares does David Joseph Gaffin hold after these transactions?

Following the reported transactions, David Joseph Gaffin directly holds 239,694 ordinary shares of Alkermes and 13,732 restricted stock units. Each restricted stock unit represents a contingent right to receive one ordinary share upon vesting under the award’s terms.

What was the purpose of the 3,049 Alkermes (ALKS) shares disposed by David Joseph Gaffin?

The 3,049 ordinary shares were disposed of at $30.73 per share to pay the exercise price or tax liability related to the equity award. This tax-withholding disposition is not an open-market sale but an administrative transaction tied to the award.

How do the Alkermes (ALKS) restricted stock units reported by Gaffin work?

Each restricted stock unit represents a contingent right to receive one Alkermes ordinary share. The award vests in four equal annual installments, starting on 2/26/2025, meaning additional units can settle into shares over the remaining scheduled vesting dates.

What role does David Joseph Gaffin hold at Alkermes (ALKS)?

David Joseph Gaffin serves as Executive Vice President and Chief Legal Officer of Alkermes, Inc. His Form 4 transactions reflect equity compensation and related tax-withholding activity associated with this senior executive officer role at the company.