    <SEC-DOCUMENT>0001387131-23-006923-index.html : 20230525
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    <ACCEPTANCE-DATETIME>20230525172906
    ACCESSION NUMBER:		0001387131-23-006923
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		25
    FILED AS OF DATE:		20230525
    DATE AS OF CHANGE:		20230525

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Alkermes plc.
    		CENTRAL INDEX KEY:			0001520262
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		IRS NUMBER:				981007018
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-35299
    		FILM NUMBER:		23962132

    	BUSINESS ADDRESS:
    		STREET 1:		CONNAUGHT HOUSE
    		STREET 2:		1 BURLINGTON ROAD
    		CITY:			DUBLIN 4
    		STATE:			L2
    		ZIP:			00000
    		BUSINESS PHONE:		00-353-1-772-8000

    	MAIL ADDRESS:
    		STREET 1:		CONNAUGHT HOUSE
    		STREET 2:		1 BURLINGTON ROAD
    		CITY:			DUBLIN 4
    		STATE:			L2
    		ZIP:			00000

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ANTLER SCIENCE TWO PLC
    		DATE OF NAME CHANGE:	20110804

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Antler Science Two Ltd
    		DATE OF NAME CHANGE:	20110509
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    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>alks-defa14a_052523.htm
    <DESCRIPTION>ADDITIONAL DEFINITIVE PROXY
    <TEXT>
    Document 1 - file: alks-defa14a_052523.htm

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>alks-01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: alks-01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>alks-02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: alks-02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>alks-03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: alks-03.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>alks-04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: alks-04.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>alks-05.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: alks-05.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>alks-06.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: alks-06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>alks-07.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: alks-07.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>alks-08.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: alks-08.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>alks-09.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: alks-09.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>alks-10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: alks-10.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>alks-11.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: alks-11.jpg

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    <SEQUENCE>13
    <FILENAME>alks-12.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: alks-12.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>alks-13.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: alks-13.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>alks-14.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: alks-14.jpg

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    <SEQUENCE>16
    <FILENAME>alks-15.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: alks-15.jpg

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    <DOCUMENT>
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    <SEQUENCE>17
    <FILENAME>alks-16.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: alks-16.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>alks-17.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: alks-17.jpg

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    <DOCUMENT>
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    <SEQUENCE>19
    <FILENAME>alks-18.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: alks-18.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
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    <FILENAME>alks-19.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: alks-19.jpg

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    <SEQUENCE>21
    <FILENAME>alks-20.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: alks-20.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>alks-21.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: alks-21.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>alks-22.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: alks-22.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>alks-23.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: alks-23.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>alks-24.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: alks-24.jpg

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