<SEC-DOCUMENT>0001973141-23-000323.txt : 20231201
<SEC-HEADER>0001973141-23-000323.hdr.sgml : 20231201
<ACCEPTANCE-DATETIME>20231201161138
ACCESSION NUMBER:		0001973141-23-000323
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20231201
DATE AS OF CHANGE:		20231201

SUBJECT COMPANY:	

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

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-36509
		FILM NUMBER:		231459617

	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:			Petersen Floyd F.
		CENTRAL INDEX KEY:			0001611286

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		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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  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001611286</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <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>Petersen Floyd F.</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</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>500</noOfUnitsSold>
      <aggregateMarketValue>28445.00</aggregateMarketValue>
      <noOfUnitsOutstanding>47907411</noOfUnitsOutstanding>
      <approxSaleDate>12/01/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/18/2022</acquiredDate>
      <natureOfAcquisitionTransaction>ESOP</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>500</amountOfSecuritiesAcquired>
      <paymentDate>05/18/2022</paymentDate>
      <natureOfPayment>N/A</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Floyd Petersen</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>10/02/2023</saleDate>
      <amountOfSecuritiesSold>500</amountOfSecuritiesSold>
      <grossProceeds>22889.55</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Floyd Petersen</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>11/01/2023</saleDate>
      <amountOfSecuritiesSold>500</amountOfSecuritiesSold>
      <grossProceeds>22651.05</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>12/01/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>06/13/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ UBS Financial Services Inc, as attorney-in-fact for Floyd Petersen</signature>
    </noticeSignature>
  </formData>
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</SEC-DOCUMENT>
