Washington, D.C. 20549


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 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).
1. Name and Address of Reporting Person*
Nichols Christian Todd

(Last) (First) (Middle)


(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)
SVP, Chief Commercial Officer
3. Date of Earliest Transaction (Month/Day/Year)
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
Rule 10b5-1(c) Transaction Indication

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
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 02/08/2024 A 27,012 A (1) 69,941 D
Ordinary Shares 02/08/2024 F 8,135 D $26.77 61,806 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 22, 2021 with a three-year performance period that ended on December 31, 2023 (the "2021 PRSUs"). The vesting of this portion of the 2021 PRSUs was triggered by the determination of achievement of certain pre-specified performance goals and application of a total shareholder return modifier and represents the final vesting event under the 2021 PRSUs.
/s/ Shantale Greenson, attorney-in-fact for Christian Todd Nichols 02/12/2024
** 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.


KNOW ALL BY THESE PRESENTS, that the undersigned hereby revokes all powers of
attorney relating to the following matters and constitutes and appoints each of
 Samuel Parisi, Shantale Greenson, Stephanie Roche, Rob Puopolo and
 Jeffrey Geary, and any one of them acting singly, as true and lawful
 attorneys-in-fact and agents, with the full power of substitution and
 resubstitution, for the undersigned and in the undersigned?s name, place and
 stead, in any and all capacities (until revoked in writing) to:

(1) prepare, execute in the undersigned?s name and on the undersigned?s behalf,
and submit to the U.S. Securities and Exchange Commission (?SEC?) a Form ID,
including amendments thereto, and any other documents necessary or appropriate
to obtain codes and passwords enabling the undersigned to make electronic
filings with the SEC of reports required by Section 16(a) of the Securities
Exchange Act of 1934, as amended (the ?Exchange Act?) or any rules or
regulations of the SEC;

(2) 	prepare, execute, acknowledge, deliver and file for and on behalf of the
undersigned, in the undersigned?s capacity as an officer and/or director of
Alkermes plc, an Irish corporation, or its subsidiaries
(together, the ?Company?), Forms 3, 4, and 5 (including any amendments thereto)
 in accordance with Section 16(a) of the Exchange Act and the rules thereunder;

(3) 	do and perform any and all acts for and on behalf of the undersigned which
 may be necessary or desirable to prepare, execute, acknowledge, deliver and
 file any such Form 3, 4, or 5, complete and execute any amendment or amendments
 thereto, and timely file such form with the SEC and any stock exchange or
 similar authority including, if necessary, non-U.S. regulators;

(4) 	seek or obtain, as the undersigned?s representative and on the
undersigned?s behalf, information on transactions in the Company?s securities
from any third party, including without limitation brokers, employee benefit
plan administrators and trustees, and the undersigned hereby authorizes any such
 person to release any such information to the undersigned and approves and
ratifies any such release of information; and

(5) 	perform any and all other acts which in the discretion of such
attorney-in-fact are necessary or desirable for and on behalf of the undersigned
 in connection with the foregoing.

The undersigned acknowledges that: (1) this Power of Attorney authorizes, but
does not require, each such attorney-in-fact to act in his or her discretion on
information provided to such attorney-in-fact without independent verification
of such information; (2) any documents prepared and/or executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney
 will be in such form and will contain such information and disclosure as such
 attorney-in-fact, in his or her discretion, deems necessary or desirable;
 (3) neither the Company nor such attorneys-in-fact assume any liability or
 obligation for the undersigned in connection with the matters covered hereby,
 including without limitation (i) any liability for the undersigned?s
 responsibility to comply with the requirements of the Exchange Act,
 (ii) any liability of the undersigned for any failure to comply with such
 requirements, or (iii) any obligation or liability of the undersigned for
 profit disgorgement under Section 16(b) of the Exchange Act; and
 (4) this Power of Attorney does not relieve the undersigned from responsibility
 for compliance with the undersigned?s obligations under the Exchange Act,
 including without limitation the reporting requirements under Section 16 of the
 Exchange Act.

The undersigned undertakes and agrees to indemnify the attorneys-in-fact against
 all actions, claims, demands, proceedings, costs, charges, expenses and other
 liabilities whatsoever which may be made against the attorneys-in-fact, or for
which the attorneys-in-fact may become liable, by reason of acting pursuant to
this Power of Attorney and the attorneys-in-fact shall not be liable to the
undersigned for any loss or damage occurring as a result of any act or omission
made by the attorneys-in-fact in good faith by reason of acting pursuant to this
 Power of Attorney.

The undersigned hereby gives and grants the foregoing attorneys-in-fact full
power and authority to do and perform all and every act and thing whatsoever
requisite, necessary or appropriate to be done in and about the foregoing
matters as fully to all intents and purposes as the undersigned might or could
do if present, hereby ratifying all that such attorneys-in-fact of, for and on
behalf of the undersigned, will lawfully do or cause to be done by virtue of
this Power of Attorney.

This Power of Attorney will remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned?s holdings of and transactions in securities issued by Alkermes plc,
 unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact. This Power of Attorney will be governed by the laws
 of the State of New York, without regard to its choice of law provisions.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of the date set forth below.

Date: 	February 5, 2024

Signed: /s/ Christian Todd Nichols

Name: 	Christian Todd Nichols