Alkermes plc (ALKS) EVP Gaffin gets 25,352 shares, disposes 7,619

Rhea-AI Filing Summary

Alkermes plc executive David Joseph Gaffin reported equity compensation activity. On February 5, 2026, he acquired 25,352 ordinary shares at no cost when performance-vesting RSUs granted on February 23, 2023 vested after a three-year performance period ending December 31, 2025.

The same day, he disposed of 7,619 ordinary shares at $33.55 per share in a transaction coded “F.” After these transactions, he directly beneficially owned 223,107 ordinary shares of Alkermes plc.

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

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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)
02/05/2026

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	02/05/2026		A		25,352	A	(1)	230,726	D
Ordinary Shares	02/05/2026		F		7,619	D	$33.55	223,107	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. These ordinary shares were acquired by the reporting person as a result of the vesting of performance-vesting restricted stock unit awards granted to the reporting person on February 23, 2023 with a three-year performance period that ended on December 31, 2025 (the "2023 PRSUs"). The vesting of this portion of the 2023 PRSUs was triggered by the determination of achievement of certain pre-specified performance goals and application of a relative total shareholder return modifier and represents the final vesting event under the 2023 PRSUs.

	/s/ Shantale Greenson, attorney-in-fact for David Joseph Gaffin	02/06/2026
	** 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.
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FAQ

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

David Joseph Gaffin reported routine equity compensation activity. He received 25,352 Alkermes ordinary shares from vesting performance-vesting RSUs, and on the same date disposed of 7,619 shares at $33.55 each, ending with 223,107 directly owned ordinary shares.

How many Alkermes (ALKS) shares does David Gaffin hold after this Form 4?

After the reported transactions, David Joseph Gaffin directly beneficially owned 223,107 Alkermes ordinary shares. This figure reflects both the 25,352 shares acquired from vesting performance-based RSUs and the 7,619 shares disposed of in the transaction coded “F” on February 5, 2026.

What triggered David Gaffin’s share acquisition in Alkermes (ALKS)?

The acquisition came from vesting of 2023 performance-vesting RSUs. These RSUs, granted February 23, 2023, vested after a three-year performance period ending December 31, 2025, based on achievement of pre-specified performance goals and a relative total shareholder return modifier.

What does the 7,619-share disposition on Alkermes (ALKS) Form 4 represent?

The Form 4 shows a disposition of 7,619 Alkermes ordinary shares on February 5, 2026 at $33.55 per share, reported under transaction code “F.” The filing classifies this as a non-derivative transaction and shows Gaffin’s direct beneficial ownership decreasing to 223,107 shares afterward.

What is David Gaffin’s role at Alkermes (ALKS) in this Form 4?

In this filing, David Joseph Gaffin is identified as an officer of Alkermes, serving as Executive Vice President and Chief Legal Officer of Alkermes, Inc. He is not listed as a director or 10% owner, and the Form 4 is filed by one reporting person.