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Disclosery

IOSP INNOSPEC INC

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COM (common), issuer CIK 1054905

265 managers (267 13F filers) reported a position in IOSP shares at 2025-09-30, 23,961,237 shares in all. 31 filers opened a position and 25 filers sold out during the quarter.

Managers
265
13F filers
267
New
31
Added
108
Reduced
97
Sold out
25
Shares held by filers
23,961,237

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

Each filer's latest stake. The shares are the aggregate the reporting persons state, which can include entities that file no 13F.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.3,632,985$280M<0.01%-29,42713F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC3,143,422$243M<0.01%-19,51913F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …2,391,749$184M0.29%-91,43613F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP1,166,975$90M0.02%-1,95013F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP929,123$71.7M<0.01%-41,10213F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC835,895$64.5M0.04%-122,59113F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP640,562$49.4M0.04%-161,94213F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC614,212$47.4M<0.01%-105,38613F-HRTimelineGroup
ROYCE & ASSOCIATES LP492,614$38M0.38%-134,88813F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC481,488$37.2M0.03%+131,48313F-HRTimelineGroup
WESTWOOD HOLDINGS GROUP INCin group WESTWOOD HOLDINGS GROUP INC447,962$34.6M0.25%+35,65213F-HRTimelineGroup
Nuveen, LLCin group TIAA411,277$31.7M0.01%+115,26513F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/375,331$29M<0.01%+79,83313F-HR/ATimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co360,590$27.8M<0.01%+4,41313F-HRTimelineGroup
Qube Research & Technologies Ltd354,012$27.3M0.04%+47,25113F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC349,972$27M0.04%-76,57213F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO320,982$24.8M<0.01%-18213F-HR/ATimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding306,405$23.6M+87,666Timeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP299,050$23.1M<0.01%-3,45213F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC282,643$21.8M<0.01%+177,97213F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.273,905$21.1M0.02%+102,16713F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson258,107$19.9M0.01%+2,68813F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY253,753$19.6M<0.01%-10,08213F-HR/ATimelineGroup
UBS Group AGgroup of 2 filers holding242,405$18.7M+10,972Timeline
Medina Value Partners, LLC235,956$18.2M4.25%new13F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp215,185$16.6M<0.01%-15,82213F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC181,209$14M0.01%+109,18513F-HRTimelineGroup
GENDELL JEFFREY Lin group GENDELL JEFFREY L174,949$13.5M0.25%+95,16813F-HRTimelineGroup
Cubist Systematic Strategies, LLC154,165$11.9M0.17%-64,92313F-HRTimeline
Walleye Capital LLCin group Walleye Capital LLC150,806$11.6M0.09%+110,68613F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC146,500$11.3M0.01%-10013F-HRTimeline
Assenagon Asset Management S.A.129,397$9.98M0.01%+108,25413F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC126,086$9.73M0.03%-34,07713F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC119,935$9.25M<0.01%-17,28113F-HRTimelineGroup
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC111,506$8.6M0.03%+41,27113F-HRTimeline
Public Sector Pension Investment Board96,866$7.47M0.03%+11,90713F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC92,766$7.16M0.01%-24,43313F-HRTimelineGroup
HRT FINANCIAL LP89,537$6.91M0.03%+57,29513F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC83,389$6.43M0.01%-11,18713F-HRTimelineGroup
Numerai GP LLC81,541$6.29M0.89%+18,64913F-HRTimeline
Invesco Ltd.in group Invesco Ltd.80,845$6.24M<0.01%-142,91813F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC79,459$6.13M0.02%+30113F-HRTimeline
ProShare Advisors LLC77,261$5.96M0.01%+2,20513F-HRTimeline
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…75,695$5.84M0.06%-1,56013F-HRTimelineGroup
RHUMBLINE ADVISERS72,488$5.59M<0.01%-8,99313F-HRTimeline
Leeward Investments, LLC - MA72,124$5.57M0.28%-1,61013F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO66,521$5.13M0.01%+11,04913F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc65,187$5.03M<0.01%-4,48613F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC62,702$4.84M<0.01%+6,84113F-HRTimelineGroup
TEACHER RETIREMENT SYSTEM OF TEXAS62,398$4.81M0.02%+2,38813F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC60,015$4.63M<0.01%-25,26213F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS52,033$4.01M<0.01%+32,04813F-HRTimelineGroup
ExodusPoint Capital Management, LP48,560$3.75M0.05%-8,24813F-HRTimeline
Swiss National Bank48,403$3.73M<0.01%+40013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC46,341$3.58M<0.01%-5,16913F-HR/ATimelineGroup
AlphaQuest LLC45,174$3.49M0.23%+16,36013F-HRTimeline
ZWJ INVESTMENT COUNSEL INC44,830$3.46M0.12%+5,41013F-HRTimeline
Moran Wealth Management, LLC44,357$3.42M0.1%+1,75413F-HRTimeline
PDT Partners, LLC42,876$3.31M0.21%+29,43313F-HRTimeline
Verition Fund Management LLC42,515$3.28M0.02%+9,89713F-HRTimeline
Edgestream Partners, L.P.41,522$3.2M0.09%-5,54613F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\41,030$3.17M<0.01%+24,63513F-HRTimelineGroup
Engineers Gate Manager LP40,710$3.14M0.04%+1,64813F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC40,233$3.1M<0.01%-107,10513F-HRTimelineGroup
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…38,971$3.01M0.01%new13F-HRTimeline
ALGERT GLOBAL LLC34,728$2.68M0.04%+4,18013F-HR/ATimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN33,891$2.62M<0.01%-14,35513F-HRTimelineGroup
DARK FOREST CAPITAL MANAGEMENT LP33,798$2.61M0.1%+4,60113F-HR/ATimeline
CONNORS INVESTOR SERVICES INC33,673$2.6M0.22%+12,10713F-HRTimeline
Y-Intercept (Hong Kong) Ltd30,152$2.33M0.06%-11,09313F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co29,631$2.28M<0.01%+36313F-HRTimelineGroup
INGALLS & SNYDER LLC28,927$2.23M0.07%013F-HRTimeline
GSA CAPITAL PARTNERS LLP28,274$2.18M0.18%+8,97413F-HRTimeline
Jump Financial, LLCin group Jump Financial, LLC27,889$2.15M0.03%+15,63013F-HR/ATimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources27,868$2.15M<0.01%+19613F-HRTimelineGroup
Bahl & Gaynor LLC27,306$2.11M0.01%+73113F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC27,314$2.1M<0.01%+22,62913F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.27,223$2.1M<0.01%013F-HRTimeline
Western Standard LLC27,000$2.08M1.11%new13F-HRTimeline
IEQ CAPITAL, LLC26,390$2.04M0.01%+16,41313F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD26,000$2.01M<0.01%new13F-HRTimeline
Trexquant Investment LP25,666$1.98M0.02%-33,75813F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…25,325$1.95M0.01%+3,46313F-HRTimelineGroup
Schonfeld Strategic Advisors LLC25,264$1.95M0.01%-4,16713F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC25,159$1.94M<0.01%-89013F-HRTimelineGroup
Holocene Advisors, LP24,530$1.89M<0.01%+5,08913F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/23,362$1.8M<0.01%+98113F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…23,063$1.78M<0.01%+113F-HRTimeline
Huber Capital Management LLC22,548$1.74M0.28%+2,40013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC22,251$1.72M<0.01%-6,04013F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC21,533$1.66M0.01%+56413F-HRTimeline
Cerity Partners LLCin group Cerity Partners LLC21,042$1.62M<0.01%+6,20913F-HRTimelineGroup
SG Americas Securities, LLC19,389$1.5M0.01%-31,53513F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…18,184$1.4M0.02%+9,13113F-HRTimelineGroup
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…17,915$1.38M<0.01%-17,84213F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…17,334$1.34M<0.01%+2,37713F-HRTimeline
Quantbot Technologies LP16,971$1.31M0.04%-14,08113F-HRTimeline
WEDGE CAPITAL MANAGEMENT L L P/NC16,345$1.26M0.02%+1,39313F-HRTimeline
OCCUDO QUANTITATIVE STRATEGIES LP16,274$1.26M0.15%-2,83513F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC15,031$1.16M<0.01%+3,17413F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…14,889$1.15M0.01%013F-HRTimelineGroup
State of Tennessee, Department of Treas…14,566$1.12M<0.01%-2,01613F-HRTimeline
Illinois Municipal Retirement Fund13,785$1.06M0.01%+86813F-HRTimeline
Creative Planningin group Creative Planning13,631$1.05M<0.01%+9,61613F-HRTimelineGroup
State of Alaska, Department of Revenue13,627$1.05M0.01%-1,21813F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC13,542$1.04M<0.01%-3,71113F-HRTimelineGroup
JACOBS LEVY EQUITY MANAGEMENT, INC13,089$1.01M<0.01%-8,96713F-HRTimeline
CAPITAL FUND MANAGEMENT S.A.12,583$971K0.01%new13F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …12,378$955K<0.01%-74913F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC12,216$943K<0.01%+4,48913F-HRTimelineGroup
QSV Equity Investors LLC12,165$939K0.96%013F-HRTimeline
CM Management, LLC12,000$926K0.77%+2,00013F-HRTimeline
Round Hill Asset Management11,974$924K0.61%013F-HRTimeline
COMERICA BANK11,838$913K<0.01%-25713F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.11,793$910K<0.01%+74513F-HRTimelineGroup
Linden Thomas Advisory Services, LLC11,772$908K0.09%+3613F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…11,674$901K<0.01%-2,09813F-HRTimelineGroup
Louisiana State Employees Retirement Sy…11,400$880K0.01%-30013F-HRTimeline
Vest Financial, LLC11,210$865K0.01%-7,04313F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management11,000$849K<0.01%-36,23913F-HRTimelineGroup
EntryPoint Capital, LLC10,685$824K0.32%+8,08913F-HRTimeline
CWM, LLCin group CWM, LLC10,172$785K<0.01%+4,68013F-HRTimelineGroup
JAMES INVESTMENT RESEARCH, INC.9,949$768K0.08%+1,61513F-HRTimeline
Quantinno Capital Management LP9,814$757K<0.01%new13F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…9,679$747K<0.01%-27,18213F-HRTimelineGroup
Freestone Grove Partners LP9,277$716K0.01%013F-HRTimeline
Entropy Technologies, LP9,179$708K0.05%-1,20013F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND8,911$688K<0.01%013F-HRTimeline
Aquatic Capital Management LLC8,758$676K0.01%-4,26613F-HRTimeline
NEW YORK STATE TEACHERS RETIREMENT SYST…7,962$614K<0.01%-3,63413F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC7,694$594K0.01%-1,58113F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…7,331$573K<0.01%+3,43813F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM7,373$569K<0.01%+5513F-HRTimeline
Semanteon Capital Management, LP7,324$565K0.71%new13F-HRTimeline
AMALGAMATED BANK7,223$557K<0.01%+9613F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…7,114$549K<0.01%+1,76613F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…7,082$546K<0.01%-25713F-HRTimeline
Police & Firemen's Retirement System of…6,949$536K<0.01%+1,32113F-HRTimeline
LPL Financial LLC6,846$528K<0.01%+15313F-HRTimeline
CAPSTONE INVESTMENT ADVISORS, LLCin group CAPSTONE INVESTMENT ADVISORS,…6,792$524K<0.01%new13F-HRTimelineGroup
Aigen Investment Management, LP6,743$520K0.08%+32113F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…6,727$519K<0.01%-2913F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…6,649$513K<0.01%013F-HRTimeline
Connor, Clark & Lunn Investment Managem…6,359$491K<0.01%new13F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…6,324$488K<0.01%-8413F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV6,309$487K<0.01%new13F-HRTimeline
MEEDER ASSET MANAGEMENT INCin group Meeder Advisory Services, Inc.6,238$481K0.03%+3,01313F-HRTimelineGroup
Inspire Investing, LLCin group Inspire Investing, LLC5,872$453K0.04%+1,25213F-HRTimelineGroup
R Squared Ltd5,841$451K0.19%+33013F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND5,631$434K0.01%-10013F-HRTimeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC5,567$430K<0.01%+1513F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC5,562$429K<0.01%new13F-HRTimelineGroup
Tredje AP-fonden5,478$423K<0.01%-9,56913F-HRTimeline
NewEdge Advisors, LLC5,363$414K<0.01%+86013F-HRTimeline
OXFORD ASSET MANAGEMENT LLP5,237$404K0.13%+2,00413F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Ensign Peak Advisors, Inc5,009$386K<0.01%-6,15013F-HR/ATimeline
KLP KAPITALFORVALTNING AS5,000$386K<0.01%013F-HRTimeline
Bell & Brown Wealth Advisors, LLC4,967$383K0.13%+113F-HRTimeline
Man Group plcin group Man Group plc4,918$379K<0.01%+37413F-HRTimelineGroup
Polymer Capital Management (US) LLC4,910$379K0.05%+1,55213F-HRTimeline
KEYBANK NATIONAL ASSOCIATION/OHin group KEYBANK NATIONAL ASSOCIATION/…4,615$356K<0.01%-28413F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA4,604$355K<0.01%-13,89713F-HRTimelineGroup
HUDSON EDGE INVESTMENT PARTNERS INC.4,593$354K0.06%+6813F-HRTimeline
Amundiin group Amundi4,490$354K<0.01%+21413F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL4,215$325K<0.01%-18,55813F-HR/ATimeline
BAILARD, INC.4,200$324K0.01%new13F-HRTimeline
Legacy Wealth Asset Management, LLC4,063$314K0.08%-8913F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…4,052$313K<0.01%013F-HRTimelineGroup
DRW Securities, LLC3,929$299K0.02%-1,18013F-HRTimeline
DIVERSIFIED TRUST CO3,798$293K0.01%+28813F-HRTimeline
Petrus Trust Company, LTA3,738$288K0.03%-2,39713F-HRTimeline
TWINBEECH CAPITAL LP3,656$282K0.01%-28,59313F-HRTimeline
Arax Advisory Partners3,611$279K<0.01%+3,50613F-HRTimeline
Maryland State Retirement & Pension Sys…3,570$275K0.01%-3,70613F-HRTimeline
Atom Investors LP3,425$264K0.02%new13F-HRTimeline
INCEPTIONR LLC3,275$253K0.06%new13F-HRTimeline
MACKENZIE FINANCIAL CORP3,156$244K<0.01%-40313F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…3,018$233K<0.01%013F-HRTimeline
CAPTRUST FINANCIAL ADVISORS2,954$228K<0.01%new13F-HRTimeline
MQS Management LLC2,954$228K0.13%-1,35713F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD2,920$225K<0.01%-6,67213F-HRTimeline
Farringdon Capital, Ltd.2,746$212K0.05%new13F-HRTimeline
CIBC Bancorp USA Inc.in group CIBC Bancorp USA Inc.2,679$207K<0.01%13F-HR/ATimelineGroup
Dynamic Technology Lab Private Ltd2,640$204K0.03%-14,16113F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,517$194K0.01%-4,19313F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,099$162K<0.01%-50913F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC1,917$148K<0.01%+15513F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…1,669$129K<0.01%-8713F-HRTimelineGroup
Sterling Capital Management LLC1,654$128K<0.01%+1,00713F-HRTimeline
Smartleaf Asset Management LLC1,317$101K0.01%+56613F-HRTimeline
FMR LLCin group FMR LLC1,006$77.6K<0.01%-98113F-HRTimelineGroup
Murphy & Mullick Capital Management Corp962$74.2K0.06%013F-HRTimeline
HM PAYSON & CO909$70.1K<0.01%013F-HRTimeline
Essential Partners LLC901$69.5K0.02%+79913F-HRTimeline
MAI Capital Management900$69.4K<0.01%+10613F-HRTimeline
KBC Group NVin group KBC Group NV860$66K<0.01%013F-HRTimelineGroup
Vestcor Inc813$63K<0.01%-1,32813F-HRTimeline
Point72 (DIFC) Ltd765$59K<0.01%new13F-HRTimeline
DANSKE BANK A/S600$46.3K<0.01%013F-HR/ATimeline
SIGNATUREFD, LLC600$46.3K<0.01%-413F-HRTimeline

Events

  • Allspring Global Investments Holdings, LLC reported 1,161,421 IOSP shares, 4.7% of the class, as of 2026-09-30, in a 13G/A filed 2026-10-07. 0001890906-26-000074

    Accepted , ingested

  • Allspring Global Investments Holdings, LLC reported 1,161,421 IOSP shares, 4.7% of the class, as of 2026-09-30, in a 13G filed 2026-10-07. 0001890906-26-000068

    Accepted , ingested