<SEC-DOCUMENT>0001973141-24-000376.txt : 20240731
<SEC-HEADER>0001973141-24-000376.hdr.sgml : 20240731
<ACCEPTANCE-DATETIME>20240731172444
ACCESSION NUMBER:		0001973141-24-000376
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20240731
DATE AS OF CHANGE:		20240731

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Amphastar Pharmaceuticals, Inc.
		CENTRAL INDEX KEY:			0001297184
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				330702205
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-36509
		FILM NUMBER:		241163096

	BUSINESS ADDRESS:	
		STREET 1:		11570 SIXTH STREET
		CITY:			RANCHO CUCAMONGA
		STATE:			CA
		ZIP:			91730
		BUSINESS PHONE:		909-980-9484

	MAIL ADDRESS:	
		STREET 1:		11570 SIXTH STREET
		CITY:			RANCHO CUCAMONGA
		STATE:			CA
		ZIP:			91730

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PETERS WILLIAM J
		CENTRAL INDEX KEY:			0001263136
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		C/O AMPHASTAR PHARMACEUTICALS, INC.
		STREET 2:		11570 6TH STREET
		CITY:			RANCHO CUCAMONGA
		STATE:			CA
		ZIP:			91730
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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    <submissionType>144</submissionType>
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      <filer>
        <filerCredentials>
          <cik>0001263136</cik>
          <ccc>XXXXXXXX</ccc>
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      <liveTestFlag>LIVE</liveTestFlag>



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    <issuerInfo>
      <issuerCik>0001297184</issuerCik>
      <issuerName>Amphastar Pharmaceuticals, Inc.</issuerName>
      <secFileNumber>001-36509</secFileNumber>
      <issuerAddress>
        <com:street1>11570 SIXTH STREET</com:street1>
        <com:city>RANCHO CUCAMONGA</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>91730</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>909-980-9484</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>PETERS WILLIAM J</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>UBS Financial Services, Inc.</name>
        <address>
          <com:street1>1000 Harbor Blvd</com:street1>
          <com:street2>3rd Floor</com:street2>
          <com:city>Weehawken</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07086</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>10282</noOfUnitsSold>
      <aggregateMarketValue>454772.00</aggregateMarketValue>
      <noOfUnitsOutstanding>48901965</noOfUnitsOutstanding>
      <approxSaleDate>07/31/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>07/31/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Exercise of stock options</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>10282</amountOfSecuritiesAcquired>
      <paymentDate>07/31/2024</paymentDate>
      <natureOfPayment>CASH</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>William Peters</name>
        <address>
          <com:street1>11570 SIXTH STREET</com:street1>
          <com:city>RANCHO CUCAMONGA</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>91730</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>06/27/2024</saleDate>
      <amountOfSecuritiesSold>3596</amountOfSecuritiesSold>
      <grossProceeds>147169.18</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>07/31/2024</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>03/14/2024</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ UBS Financial Services Inc, as attorney-in-fact for William J Peters</signature>
    </noticeSignature>
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</SEC-DOCUMENT>
