    <SEC-DOCUMENT>0001999371-25-003291-index.html : 20250327
    <SEC-HEADER>0001999371-25-003291.hdr.sgml : 20250327
    <ACCEPTANCE-DATETIME>20250327162436
    ACCESSION NUMBER:		0001999371-25-003291
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		73
    CONFORMED PERIOD OF REPORT:	20250509
    FILED AS OF DATE:		20250327
    DATE AS OF CHANGE:		20250327

    FILER:

    	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:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-13879
    		FILM NUMBER:		25779715

    	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
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>innospec_def14a.htm
    <DESCRIPTION>DEFINITIVE PROXY STATEMENT
    <TEXT>
    Document 1 - file: innospec_def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>2
    <FILENAME>iosp-20241231.xsd
    <DESCRIPTION>XBRL SCHEMA FILE
    <TEXT>
    Document 2 - file: iosp-20241231.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>3
    <FILENAME>iosp-20241231_def.xml
    <DESCRIPTION>XBRL DEFINITION FILE
    <TEXT>
    Document 3 - file: iosp-20241231_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>4
    <FILENAME>iosp-20241231_lab.xml
    <DESCRIPTION>XBRL LABEL FILE
    <TEXT>
    Document 4 - file: iosp-20241231_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>iosp-20241231_pre.xml
    <DESCRIPTION>XBRL PRESENTATION FILE
    <TEXT>
    Document 5 - file: iosp-20241231_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>innospec_def14aimg001.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: innospec_def14aimg001.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>innospec_def14aimg002.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: innospec_def14aimg002.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>innospec_def14aimg003.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: innospec_def14aimg003.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>innospec_def14aimg004.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: innospec_def14aimg004.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>innospec_def14aimg005.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: innospec_def14aimg005.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>innospec_def14aimg006.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: innospec_def14aimg006.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>innospec_def14aimg007.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: innospec_def14aimg007.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>innospec_def14aimg008.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: innospec_def14aimg008.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>innospec_def14aimg009.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: innospec_def14aimg009.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>innospec_def14aimg010.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: innospec_def14aimg010.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>innospec_def14aimg011.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: innospec_def14aimg011.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>innospec_def14aimg012.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: innospec_def14aimg012.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>innospec_def14aimg013.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: innospec_def14aimg013.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>innospec_def14aimg014.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: innospec_def14aimg014.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>innospec_def14aimg015.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: innospec_def14aimg015.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>innospec_def14aimg016.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: innospec_def14aimg016.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>innospec_def14aimg017.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: innospec_def14aimg017.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>innospec_def14aimg018.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: innospec_def14aimg018.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>innospec_def14aimg019.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: innospec_def14aimg019.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>innospec_def14aimg020.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: innospec_def14aimg020.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>innospec_def14aimg021.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: innospec_def14aimg021.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>innospec_def14aimg022.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: innospec_def14aimg022.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>innospec_def14aimg023.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: innospec_def14aimg023.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>innospec_def14aimg024.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: innospec_def14aimg024.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>innospec_def14aimg025.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: innospec_def14aimg025.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>innospec_def14aimg026.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: innospec_def14aimg026.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>innospec_def14aimg027.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: innospec_def14aimg027.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>innospec_def14aimg028.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 33 - file: innospec_def14aimg028.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>innospec_def14aimg029.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 34 - file: innospec_def14aimg029.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>innospec_def14aimg030.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 35 - file: innospec_def14aimg030.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>innospec_def14aimg031.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 36 - file: innospec_def14aimg031.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>innospec_def14aimg032.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 37 - file: innospec_def14aimg032.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>innospec_def14aimg033.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 38 - file: innospec_def14aimg033.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>innospec_def14aimg034.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 39 - file: innospec_def14aimg034.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>innospec_def14aimg035.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 40 - file: innospec_def14aimg035.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>innospec_def14aimg036.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 41 - file: innospec_def14aimg036.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>42
    <FILENAME>innospec_def14aimg037.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 42 - file: innospec_def14aimg037.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>43
    <FILENAME>innospec_def14aimg038.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 43 - file: innospec_def14aimg038.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>44
    <FILENAME>innospec_def14aimg039.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 44 - file: innospec_def14aimg039.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>45
    <FILENAME>innospec_def14aimg040.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 45 - file: innospec_def14aimg040.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>46
    <FILENAME>innospec_def14aimg041.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 46 - file: innospec_def14aimg041.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>47
    <FILENAME>innospec_def14aimg042.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 47 - file: innospec_def14aimg042.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>48
    <FILENAME>innospec_def14aimg043.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 48 - file: innospec_def14aimg043.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>49
    <FILENAME>innospec_def14aimg044.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 49 - file: innospec_def14aimg044.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>50
    <FILENAME>innospec_def14aimg045.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 50 - file: innospec_def14aimg045.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>51
    <FILENAME>innospec_def14aimg046.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 51 - file: innospec_def14aimg046.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>52
    <FILENAME>innospec_def14aimg047.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 52 - file: innospec_def14aimg047.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>53
    <FILENAME>innospec_def14aimg048.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 53 - file: innospec_def14aimg048.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>54
    <FILENAME>proxycard001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 54 - file: proxycard001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>55
    <FILENAME>proxycard002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 55 - file: proxycard002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>56
    <FILENAME>proxycard003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 56 - file: proxycard003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>57
    <FILENAME>proxycard004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 57 - file: proxycard004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>58
    <FILENAME>proxycard005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 58 - file: proxycard005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>59
    <FILENAME>proxycard006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 59 - file: proxycard006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>60
    <FILENAME>proxycard007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 60 - file: proxycard007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>61
    <FILENAME>proxycard008.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 61 - file: proxycard008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>62
    <FILENAME>proxycard009.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 62 - file: proxycard009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>63
    <FILENAME>proxycard010.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 63 - file: proxycard010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>64
    <FILENAME>proxycard011.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 64 - file: proxycard011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>66
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 66 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>67
    <FILENAME>R2.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 67 - file: R2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>68
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 68 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>69
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 69 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>71
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 71 - file: FilingSummary.html

    Document 71 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>73
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 73 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>74
    <FILENAME>0001999371-25-003291-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 74 - file: 0001999371-25-003291-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>75
    <FILENAME>innospec_def14a_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 75 - file: innospec_def14a_htm.html

    Document 75 - RAW XML: innospec_def14a_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>