[Form 4/A] Alkermes plc. Amended Insider Trading Activity

Rhea-AI Filing Summary

Alkermes plc director Richard Gaynor reported an amended insider filing reflecting equity awards granted as compensation. He received a restricted stock unit award for 5,409 units, each representing a contingent right to receive one ordinary share.

He was also granted a non-qualified stock option for 11,538 ordinary shares with an exercise price of $36.98 per share, expiring on May 20, 2036. All shares subject to these awards vest, and for the option become exercisable, in full on the earlier of the one-year anniversary of the grant date or the issuer’s next annual general meeting of shareholders that occurs at least 50 weeks after the grant date. The amendment corrects previously misreported vesting terms.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider GAYNOR RICHARD

Role null

Type	Security	Shares	Price	Value
Grant/Award	Non Qualified Stock Option (Right to Buy)	11,538	$0.00	--
Grant/Award	Restricted Stock Unit Award	5,409	$0.00	--

Holdings After Transaction: Non Qualified Stock Option (Right to Buy) — 11,538 shares (Direct, null); Restricted Stock Unit Award — 5,409 shares (Direct, null)

Footnotes (1)

1. Shares subject to the award vest (and if applicable, become exercisable) in full on the earlier of the one-year anniversary of the date of grant or the date of the issuer's next annual general meeting of shareholders that occurs at least 50 weeks after the date of grant. This amendment is being filed to reflect the vesting terms applicable to this award, which were reported incorrectly on the original Form 4. The correct vesting schedule is set forth in Footnote 1 above. Each restricted stock unit represents a contingent right to receive one ordinary share.

Key Figures

Restricted stock units granted: 5,409 units Stock options granted: 11,538 options Option exercise price: $36.98 per share +3 more

6 metrics

Restricted stock units granted 5,409 units Award to director Richard Gaynor

Stock options granted 11,538 options Non-qualified stock option award

Option exercise price $36.98 per share Non-qualified stock option strike price

Option expiration date May 20, 2036 Non-qualified stock option term end

Shares underlying RSUs 5,409 ordinary shares Each RSU equals one share

Shares underlying options 11,538 ordinary shares Underlying security for stock options

Key Terms

Restricted Stock Unit Award, Non Qualified Stock Option, contingent right, annual general meeting of shareholders

4 terms

Restricted Stock Unit Award financial

"security_title: Restricted Stock Unit Award"

A restricted stock unit award is a promise by a company to give an employee a specified number of company shares at a future date if certain conditions are met, such as staying with the company or hitting performance goals. For investors, these awards matter because they can increase the total number of shares outstanding when converted, diluting existing holders, and they align employees’ incentives with shareholders’ interests much like giving a rising bonus that becomes real only after conditions are satisfied.

Non Qualified Stock Option financial

"security_title: Non Qualified Stock Option (Right to Buy)"

contingent right financial

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

annual general meeting of shareholders financial

"the issuer's next annual general meeting of shareholders that occurs at least 50 weeks after the date of grant."

Form 4 Insider Transactions: What Each Field Means →

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).

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^*

GAYNOR RICHARD

(Last) (First) (Middle)

CONNAUGHT HOUSE

1 BURLINGTON ROAD

(Street)

DUBLIN 4 Ireland

(City) (State) (Zip)

IRELAND

(Country)

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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)
05/22/2026

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

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
Non Qualified Stock Option (Right to Buy)	$36.98	05/20/2026		A		11,538		(1)(2)	05/20/2036	Ordinary Shares	11,538	$0	11,538	D
Restricted Stock Unit Award	(3)	05/20/2026		A		5,409		(1)(2)	(1)(2)	Ordinary Shares	5,409	$0	5,409	D

Explanation of Responses:

1. Shares subject to the award vest (and if applicable, become exercisable) in full on the earlier of the one-year anniversary of the date of grant or the date of the issuer's next annual general meeting of shareholders that occurs at least 50 weeks after the date of grant.

2. This amendment is being filed to reflect the vesting terms applicable to this award, which were reported incorrectly on the original Form 4. The correct vesting schedule is set forth in Footnote 1 above.

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

	/s/ Shantale Greenson, attorney-in-fact for Richard Gaynor	05/22/2026
	** 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)