    <SEC-DOCUMENT>0001839882-23-015388-index.html : 20230613
    <SEC-HEADER>0001839882-23-015388.hdr.sgml : 20230613
    <ACCEPTANCE-DATETIME>20230613165505
    ACCESSION NUMBER:		0001839882-23-015388
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		5
    FILED AS OF DATE:		20230613
    DATE AS OF CHANGE:		20230613

    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:		231011960

    	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
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>alkermes-defa14a_061323.htm
    <DESCRIPTION>ADDITIONAL DEFINITIVE MATERIAL
    <TEXT>
    Document 1 - file: alkermes-defa14a_061323.htm

    </DOCUMENT>
    <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

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

    </DOCUMENT>
    </SEC-DOCUMENT>