Alkermes (ALKS) COO logs RSU share gain and tax-related share disposal

Rhea-AI Filing Summary

Alkermes plc EVP and COO Jackson Blair Curtis reported equity compensation-related transactions. On February 26, 2026, he acquired 8,322 ordinary shares upon the exercise of a restricted stock unit award, with each unit representing one ordinary share. On the same date, 3,695 ordinary shares were disposed of at $30.73 per share to satisfy tax withholding obligations. Following these transactions, Curtis directly owned 241,308 ordinary shares. The underlying restricted stock units vest in four equal annual installments beginning on February 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

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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^*

Jackson Blair Curtis

(Last) (First) (Middle)

900 WINTER ST.

(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, Chief Operating Officer

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		8,322	A	(1)	245,003	D
Ordinary Shares	02/26/2026		F		3,695	D	$30.73	241,308	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			8,322	(2)	(2)	Ordinary Shares	8,322	(1)	16,645	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 Blair C. Jackson	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).
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FAQ

What insider transactions did Alkermes (ALKS) COO Jackson Blair Curtis report?

Jackson Blair Curtis reported an RSU vesting and related tax share disposition. He acquired 8,322 ordinary shares through a restricted stock unit conversion and had 3,695 shares withheld and disposed of at $30.73 per share to satisfy tax obligations.

How many Alkermes (ALKS) shares does Jackson Blair Curtis own after this Form 4?

After the reported transactions, Curtis directly owns 241,308 Alkermes ordinary shares. This reflects shares received from the restricted stock unit conversion, net of the 3,695 shares disposed of to cover tax withholding on February 26, 2026.

What did the restricted stock unit transaction involve for Alkermes (ALKS) COO Curtis?

The transaction involved exercising a restricted stock unit award into ordinary shares. Each restricted stock unit converted into one Alkermes ordinary share, resulting in 8,322 shares acquired with no cash price per share reported for the conversion event.

Why were 3,695 Alkermes (ALKS) shares disposed of in Curtis’s Form 4?

The 3,695 shares were disposed of to satisfy tax withholding obligations. The shares were valued at $30.73 each and used to pay the tax liability associated with the restricted stock unit vesting, rather than representing an open-market sale.

How do Jackson Blair Curtis’s restricted stock units in Alkermes (ALKS) vest over time?

The restricted stock unit award vests in four equal annual installments. Vesting begins on February 26, 2025, meaning a quarter of the RSUs vest each year over four years, contingent on the applicable award terms and continued service.

Does this Alkermes (ALKS) Form 4 indicate an open-market stock purchase or sale?

No open-market purchase or sale is indicated in this Form 4. Curtis acquired 8,322 shares via restricted stock unit conversion and disposed of 3,695 shares solely to cover tax withholding tied to that equity compensation event.