<SEC-DOCUMENT>0001964306-25-000255.txt : 20250610
<SEC-HEADER>0001964306-25-000255.hdr.sgml : 20250610
<ACCEPTANCE-DATETIME>20250610162953
ACCESSION NUMBER:		0001964306-25-000255
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250610
DATE AS OF CHANGE:		20250610

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Alkermes plc.
		CENTRAL INDEX KEY:			0001520262
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				981007018
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-35299
		FILM NUMBER:		251037500

	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

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Nichols Christian Todd
		CENTRAL INDEX KEY:			0001813312
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		852 WINTER STREET
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
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  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001813312</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001520262</issuerCik>
      <issuerName>Alkermes plc.</issuerName>
      <secFileNumber>001-35299</secFileNumber>
      <issuerAddress>
        <com:street1>CONNAUGHT HOUSE</com:street1>
        <com:street2>1 BURLINGTON ROAD</com:street2>
        <com:city>DUBLIN 4</com:city>
        <com:stateOrCountry>L2</com:stateOrCountry>
        <com:zipCode>00000</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>00-353-1-772-8000</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Nichols Christian Todd</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Ordinary shares</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Merrill Lynch</name>
        <address>
          <com:street1>225 Liberty St</com:street1>
          <com:street2>Floor 37</com:street2>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10281</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>3334</noOfUnitsSold>
      <aggregateMarketValue>103654.06</aggregateMarketValue>
      <noOfUnitsOutstanding>164901285</noOfUnitsOutstanding>
      <approxSaleDate>06/10/2025</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Ordinary shares</securitiesClassTitle>
      <acquiredDate>02/18/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Alkermes plc.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3334</amountOfSecuritiesAcquired>
      <paymentDate>02/18/2025</paymentDate>
      <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Christian Todd Nichols</name>
        <address>
          <com:street1>CONNAUGHT HOUSE</com:street1>
          <com:street2>1 BURLINGTON ROAD</com:street2>
          <com:city>DUBLIN 4</com:city>
          <com:stateOrCountry>L2</com:stateOrCountry>
          <com:zipCode>00000</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Ordinary shares</securitiesClassTitle>
      <saleDate>06/09/2025</saleDate>
      <amountOfSecuritiesSold>3333</amountOfSecuritiesSold>
      <grossProceeds>106489.35</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/10/2025</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>03/10/2025</planAdoptionDate>
      </planAdoptionDates>
      <signature>Christian Todd Nichols</signature>
    </noticeSignature>
  </formData>
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</SEC-DOCUMENT>
