Alkermes (ALKS) EVP Gaffin converts RSUs and withholds shares for taxes

Rhea-AI Filing Summary

Alkermes plc executive David Joseph Gaffin, EVP and CLO of Alkermes, Inc., reported equity award activity involving restricted stock units and ordinary shares. On February 23, 2026, 7,689 restricted stock units were exercised or converted at $0.00 per unit into 7,689 ordinary shares, increasing his directly held ordinary shares to 239,291 before a related tax transaction. In a separate transaction the same day, 3,414 ordinary shares were disposed of at $32.19 per share to cover tax withholding, leaving him with 235,877 directly owned ordinary shares. Each restricted stock unit represents one ordinary share, and the award vests in four equal annual installments beginning on February 23, 2024.

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)
02/23/2026

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	02/23/2026		M		7,689	A	(1)	239,291	D
Ordinary Shares	02/23/2026		F		3,414	D	$32.19	235,877	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)	02/23/2026		M			7,689	(2)	(2)	Ordinary Shares	7,689	(1)	7,690	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 2/23/2024.

	/s/ Shantale Greenson, attorney-in-fact for David Joseph Gaffin	02/25/2026
	** 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).
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FAQ

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

Alkermes reported that EVP and CLO David Joseph Gaffin exercised 7,689 restricted stock units into ordinary shares and had 3,414 ordinary shares withheld to satisfy tax obligations, all on February 23, 2026, as part of his equity compensation.

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

After these transactions, David Joseph Gaffin directly owns 235,877 Alkermes ordinary shares. This reflects the conversion of 7,689 restricted stock units into shares and the tax-withholding disposition of 3,414 shares reported for February 23, 2026.

What does the RSU transaction for Alkermes (ALKS) executive Gaffin involve?

The restricted stock unit transaction involves converting 7,689 RSUs into 7,689 ordinary shares at no purchase price. Each RSU equals one ordinary share, and the award vests over four years in equal annual installments starting February 23, 2024.

Why were 3,414 Alkermes (ALKS) shares disposed of in Gaffin’s Form 4?

The 3,414 ordinary shares were disposed of to cover tax withholding obligations tied to the RSU vesting and conversion. This disposition occurred at a reported price of $32.19 per share on February 23, 2026, and is characterized as a tax-withholding transaction.

How do Alkermes (ALKS) restricted stock units vest for executive David Gaffin?

Gaffin’s restricted stock unit award vests in four equal annual installments. The vesting schedule began on February 23, 2024, with each vested unit automatically representing the right to receive one Alkermes ordinary share upon settlement.

Is the Alkermes (ALKS) Form 4 for David Gaffin an open-market stock purchase or sale?

The Form 4 reflects an exercise or conversion of 7,689 restricted stock units into ordinary shares and a tax-withholding share disposition. It does not describe an open-market purchase or sale but rather equity award settlement and related tax withholding.