<SEC-DOCUMENT>0000814133-25-000048.txt : 20250513
<SEC-HEADER>0000814133-25-000048.hdr.sgml : 20250513
<ACCEPTANCE-DATETIME>20250513153753
ACCESSION NUMBER:		0000814133-25-000048
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250513
DATE AS OF CHANGE:		20250513

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INNOSPEC INC.
		CENTRAL INDEX KEY:			0001054905
		STANDARD INDUSTRIAL CLASSIFICATION:	CHEMICALS & ALLIED PRODUCTS [2800]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				981081725
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-54153
		FILM NUMBER:		25939591

	BUSINESS ADDRESS:	
		STREET 1:		8310 SOUTH VALLEY HIGHWAY
		STREET 2:		SUITE 350
		CITY:			ENGLEWOOD
		STATE:			CO
		ZIP:			80112
		BUSINESS PHONE:		7203556451

	MAIL ADDRESS:	
		STREET 1:		8310 SOUTH VALLEY HIGHWAY
		STREET 2:		SUITE 350
		CITY:			ENGLEWOOD
		STATE:			CO
		ZIP:			80112

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	OCTEL CORP
		DATE OF NAME CHANGE:	19980209

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WASATCH ADVISORS LP
		CENTRAL INDEX KEY:			0000814133
		ORGANIZATION NAME:           	
		EIN:				870319391
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		505 WAKARA WAY
		STREET 2:		3RD FLOOR
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84108
		BUSINESS PHONE:		8015330777

	MAIL ADDRESS:	
		STREET 1:		505 WAKARA WAY
		STREET 2:		3RD FLOOR
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84108

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WASATCH ADVISORS INC
		DATE OF NAME CHANGE:	19990611
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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    <submissionType>SCHEDULE 13G/A</submissionType>
    <previousAccessionNumber>0000814133-23-000024</previousAccessionNumber>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0000814133</cik>
          <ccc>XXXXXXXX</ccc>
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      <liveTestFlag>LIVE</liveTestFlag>


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  </headerData>
  <formData>
    <coverPageHeader>
      <amendmentNo>3</amendmentNo>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>03/31/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001054905</issuerCik>
        <issuerName>INNOSPEC INC.</issuerName>
        <issuerCusip>45768S105</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>8310 SOUTH VALLEY HIGHWAY</com:street1>
          <com:street2>8310 SOUTH VALLEY HIGHWAY</com:street2>
          <com:city>ENGLEWOOD</com:city>
          <com:stateOrCountry>CO</com:stateOrCountry>
          <com:zipCode>80112</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>WASATCH ADVISORS LP</reportingPersonName>
      <memberGroup>a</memberGroup>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>416111.00</soleVotingPower>
        <sharedVotingPower>0.00</sharedVotingPower>
        <soleDispositivePower>528144.00</soleDispositivePower>
        <sharedDispositivePower>0.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>528144.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <classPercent>2.1</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
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        <issuerName>INNOSPEC INC.</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>8310 SOUTH VALLEY HIGHWAY, 8310 SOUTH VALLEY HIGHWAY, ENGLEWOOD, COLORADO, 80112</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>Wasatch Advisors LP</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>505 Wakara Way, 3rd Floor, Salt Lake City, 84108, United States</principalBusinessOfficeOrResidenceAddress>
        <citizenship>DELAWARE</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
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      <item4>
        <amountBeneficiallyOwned>528,144</amountBeneficiallyOwned>
        <classPercent>2.1</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>416,111</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>0</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>528,144</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>0</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
      </item5>
      <item6>
        <notApplicableFlag>Y</notApplicableFlag>
      </item6>
      <item7>
        <notApplicableFlag>Y</notApplicableFlag>
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        <notApplicableFlag>Y</notApplicableFlag>
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      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
      </item9>
      <item10>
        <notApplicableFlag>N</notApplicableFlag>
        <certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under &amp;#167; 240.14a-11.

</certifications>
      </item10>
    </items>
    <signatureInformation>
      <reportingPersonName>WASATCH ADVISORS LP</reportingPersonName>
      <signatureDetails>
        <signature>Mike Yeates</signature>
        <title>CEO</title>
        <date>03/31/2025</date>
      </signatureDetails>
    </signatureInformation>
  </formData>
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</SEC-DOCUMENT>
