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IOSP INNOSPEC INC

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COM (common), issuer CIK 1054905

259 managers (261 13F filers) reported a position in IOSP shares at 2025-12-31, 24,299,538 shares in all. 25 filers opened a position and 30 filers sold out during the quarter.

Managers
259
13F filers
261
New
25
Added
105
Reduced
92
Sold out
30
Shares held by filers
24,299,538

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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.3,662,323$280M<0.01%+29,33813F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC3,121,151$239M<0.01%-22,27113F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …2,356,503$180M0.29%-35,24613F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP1,175,122$89.9M0.02%+8,14713F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC950,074$72.7M0.04%+114,17913F-HRTimeline
STATE STREET CORPin group STATE STREET CORP949,038$72.6M<0.01%+19,91513F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC609,220$46.6M<0.01%-4,99213F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC533,312$40.8M0.03%+51,82413F-HRTimelineGroup
Nuveen, LLCin group TIAA502,603$38.5M0.01%+91,32613F-HRTimelineGroup
WESTWOOD HOLDINGS GROUP INCin group WESTWOOD HOLDINGS GROUP INC491,451$37.6M0.31%+43,48913F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC484,968$37.1M0.01%+202,32513F-HR/ATimelineGroup
Medina Value Partners, LLC378,769$29M6.77%+142,81313F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co373,540$28.6M<0.01%+12,95013F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/322,358$24.7M<0.01%-52,97313F-HRTimelineGroup
Qube Research & Technologies Ltd320,504$24.5M0.04%-33,50813F-HRTimeline
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding318,714$24.4M+12,309Timeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.309,927$23.7M0.02%+36,02213F-HRTimelineGroup
BROWN ADVISORY INCin group BROWN ADVISORY INC305,977$23.4M0.03%-43,99513F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO305,875$23.4M<0.01%-15,10713F-HRTimelineGroup
ROYCE & ASSOCIATES LP305,226$23.4M0.24%-187,38813F-HRTimeline
GENDELL JEFFREY Lin group GENDELL JEFFREY L285,351$21.8M0.38%+110,40213F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP274,689$21M<0.01%-24,36113F-HRTimelineGroup
Western Standard LLC268,367$20.5M9.48%+241,36713F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC268,151$20.5M0.01%+86,94213F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY243,535$18.6M<0.01%-10,21813F-HR/ATimelineGroup
UBS Group AGgroup of 2 filers holding220,727$16.9M-21,678Timeline
Assenagon Asset Management S.A.178,204$13.6M0.02%+48,80713F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson150,851$11.5M0.01%-107,25613F-HRTimelineGroup
NORGES BANK139,200$10.7M<0.01%new13F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC138,401$10.6M0.04%+12,31513F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp137,828$10.5M<0.01%-77,35713F-HRTimelineGroup
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC125,062$9.57M0.03%+13,55613F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC120,300$9.21M0.01%-26,20013F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC118,107$9.04M<0.01%-1,82813F-HRTimelineGroup
HRT FINANCIAL LP116,932$8.95M0.03%+27,39513F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC108,961$8.34M0.01%+16,19513F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.104,639$8.01M<0.01%+23,79413F-HRTimelineGroup
Walleye Capital LLCin group Walleye Capital LLC103,935$7.96M0.05%-46,87113F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO103,702$7.94M0.01%+37,18113F-HRTimelineGroup
FIRST WILSHIRE SECURITIES MANAGEMENT INC100,574$7.7M1.94%new13F-HRTimeline
Numerai GP LLC98,269$7.52M0.91%+16,72813F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.95,775$7.33M0.01%+83,98213F-HRTimelineGroup
ZWJ INVESTMENT COUNSEL INC94,535$7.24M0.26%+49,70513F-HRTimeline
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…87,921$6.73M0.07%+12,22613F-HRTimelineGroup
Public Sector Pension Investment Board85,714$6.56M0.02%-11,15213F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS84,425$6.46M0.02%+22,02713F-HRTimeline
ProShare Advisors LLC83,739$6.41M0.01%+6,47813F-HRTimeline
PANAGORA ASSET MANAGEMENT INC82,098$6.28M0.02%+2,63913F-HRTimeline
SG Americas Securities, LLC75,814$5.8M0.01%+56,42513F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC72,694$5.56M<0.01%-10,69513F-HRTimelineGroup
Leeward Investments, LLC - MA71,687$5.49M0.28%-43713F-HRTimeline
RHUMBLINE ADVISERS70,197$5.37M<0.01%-2,29113F-HRTimeline
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…68,049$5.21M0.01%+29,07813F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc62,461$4.78M<0.01%-2,72613F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC60,287$4.61M<0.01%+27213F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC54,316$4.16M<0.01%-8,38613F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC51,556$3.95M0.04%+30,02313F-HRTimeline
Engineers Gate Manager LP49,862$3.82M0.05%+9,15213F-HRTimeline
Swiss National Bank49,003$3.75M<0.01%+60013F-HRTimeline
Edgestream Partners, L.P.46,434$3.55M0.1%+4,91213F-HRTimeline
Trexquant Investment LP46,073$3.53M0.03%+20,40713F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC45,848$3.51M<0.01%-49313F-HRTimelineGroup
Creative Planningin group Creative Planning44,693$3.42M<0.01%+31,06213F-HRTimelineGroup
DARK FOREST CAPITAL MANAGEMENT LP44,524$3.41M0.16%+10,72613F-HRTimeline
PDT Partners, LLC42,876$3.28M0.21%013F-HRTimeline
AlphaQuest LLC42,228$3.23M0.18%-2,94613F-HRTimeline
Moran Wealth Management, LLC42,035$3.22M0.1%-2,32213F-HRTimeline
IEQ CAPITAL, LLC39,774$3.04M0.01%+13,38413F-HRTimeline
FMR LLCin group FMR LLC36,921$2.83M<0.01%+35,91513F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN35,091$2.69M<0.01%+1,20013F-HRTimelineGroup
ALGERT GLOBAL LLC34,278$2.62M0.04%-45013F-HR/ATimeline
CONNORS INVESTOR SERVICES INC32,525$2.49M0.21%-1,14813F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…30,314$2.32M0.01%+4,98913F-HRTimelineGroup
INGALLS & SNYDER LLC28,927$2.21M0.08%013F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources28,511$2.18M<0.01%+64313F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/28,383$2.17M<0.01%+5,02113F-HRTimeline
ALLIANCEBERNSTEIN L.P.26,923$2.06M<0.01%-30013F-HRTimeline
Verition Fund Management LLC26,664$2.04M0.01%-15,85113F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD26,000$1.99M<0.01%013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC25,264$1.93M<0.01%-14,96913F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd24,614$1.88M0.04%-5,53813F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…23,800$1.82M<0.01%+73713F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC23,464$1.8M<0.01%-1,69513F-HRTimelineGroup
Atom Investors LP22,830$1.75M0.14%+19,40513F-HRTimeline
Huber Capital Management LLC22,548$1.73M0.25%013F-HRTimeline
Jump Financial, LLCin group Jump Financial, LLC22,300$1.71M0.02%-5,58913F-HRTimelineGroup
Jain Global LLC22,159$1.7M0.02%new13F-HRTimeline
CAPITAL FUND MANAGEMENT S.A.21,877$1.67M0.02%+9,29413F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co21,279$1.63M<0.01%-8,35213F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…20,136$1.54M<0.01%+2,80213F-HRTimeline
CM Management, LLC20,000$1.53M1.29%+8,00013F-HRTimeline
WEDGE CAPITAL MANAGEMENT L L P/NC19,699$1.51M0.03%+3,35413F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\19,665$1.51M<0.01%-21,36513F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC19,309$1.48M<0.01%-1,73313F-HRTimelineGroup
Holocene Advisors, LP19,045$1.46M<0.01%-5,48513F-HRTimeline
CITIGROUP INCin group CITIGROUP INC17,713$1.36M<0.01%-4,53813F-HRTimelineGroup
Schonfeld Strategic Advisors LLC17,677$1.35M0.01%-7,58713F-HRTimeline
ExodusPoint Capital Management, LP17,622$1.35M0.02%-30,93813F-HRTimeline
GSA CAPITAL PARTNERS LLP17,422$1.33M0.11%-10,85213F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…17,026$1.3M<0.01%-88913F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC15,683$1.21M<0.01%+10,12113F-HRTimelineGroup
Entropy Technologies, LP14,979$1.15M0.06%+5,80013F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC14,847$1.14M<0.01%-18413F-HR/ATimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…14,256$1.09M0.01%-63313F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC14,159$1.08M<0.01%-13,15513F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS14,005$1.07M<0.01%-38,02813F-HRTimelineGroup
State of Alaska, Department of Revenue13,747$1.05M0.01%+12013F-HRTimeline
Freestone Grove Partners LP13,475$1.03M0.01%+4,19813F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…13,462$1.03M0.02%-4,72213F-HRTimelineGroup
Illinois Municipal Retirement Fund12,767$977K0.01%-1,01813F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP12,276$940K<0.01%-628,28613F-HRTimelineGroup
Round Hill Asset Management11,974$916K0.58%013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…11,628$890K<0.01%+4,51413F-HRTimelineGroup
JACOBS LEVY EQUITY MANAGEMENT, INC11,622$890K<0.01%-1,46713F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …11,594$887K<0.01%-78413F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…11,555$884K<0.01%-11913F-HRTimelineGroup
Louisiana State Employees Retirement Sy…11,400$873K0.01%013F-HRTimeline
Linden Thomas Advisory Services, LLC11,361$870K0.09%-41113F-HRTimeline
CAPSTONE INVESTMENT ADVISORS, LLCin group CAPSTONE INVESTMENT ADVISORS,…11,352$869K0.01%+4,56013F-HRTimelineGroup
COMERICA BANK11,236$860K<0.01%-60213F-HRTimeline
State of Tennessee, Department of Treas…10,163$831K<0.01%-4,40313F-HRTimeline
QSV Equity Investors LLC10,694$819K1.21%-1,47113F-HRTimeline
EntryPoint Capital, LLC10,685$818K0.32%013F-HRTimeline
CWM, LLCin group CWM, LLC10,452$800K<0.01%+28013F-HRTimelineGroup
Legato Capital Management LLC10,049$769K0.07%new13F-HRTimeline
JAMES INVESTMENT RESEARCH, INC.9,949$761K0.08%013F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd9,737$745K0.02%new13F-HRTimelineGroup
Aquatic Capital Management LLC9,659$739K0.02%+90113F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…9,223$725K<0.01%+1,89213F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…9,465$724K<0.01%+2,81613F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP9,228$706K<0.01%new13F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND8,911$682K<0.01%013F-HRTimeline
INCEPTIONR LLC8,582$657K0.18%+5,30713F-HRTimeline
Vident Advisory, LLCin group Vident Advisory, LLC8,503$651K0.01%new13F-HRTimelineGroup
Brooklyn Investment Group7,847$616K0.03%new13F-HRTimeline
NEW YORK STATE TEACHERS RETIREMENT SYST…7,962$609K<0.01%013F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV7,535$577K<0.01%+1,22613F-HRTimeline
Quantinno Capital Management LP7,297$559K<0.01%-2,51713F-HRTimeline
AMALGAMATED BANK7,215$552K<0.01%-813F-HRTimeline
Police & Firemen's Retirement System of…6,951$532K<0.01%+213F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC6,713$532K0.01%-98113F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM6,885$527K<0.01%-48813F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…6,727$515K<0.01%013F-HRTimeline
NewEdge Advisors, LLC6,511$498K<0.01%+1,14813F-HRTimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …6,238$477K<0.01%new13F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…6,230$476K<0.01%-85213F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…6,134$469K<0.01%-19013F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…6,123$469K<0.01%-3,55613F-HRTimelineGroup
Inspire Investing, LLCin group Inspire Investing, LLC6,086$466K0.04%+21413F-HRTimelineGroup
KEYBANK NATIONAL ASSOCIATION/OHin group KEYBANK NATIONAL ASSOCIATION/…6,001$459K<0.01%+1,38613F-HRTimelineGroup
Quadrature Capital Ltdin group Quadrature Capital Ltd5,955$456K<0.01%new13F-HRTimelineGroup
R Squared Ltd5,883$450K0.21%+4213F-HRTimeline
Man Group plcin group Man Group plc5,717$438K<0.01%+79913F-HRTimelineGroup
OREGON PUBLIC EMPLOYEES RETIREMENT FUND5,631$431K0.01%013F-HRTimeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC5,589$428K<0.01%+2213F-HRTimelineGroup
Ethic Inc.5,351$410K0.01%new13F-HRTimeline
KLP KAPITALFORVALTNING AS5,300$406K<0.01%+30013F-HRTimeline
Amundiin group Amundi5,189$397K<0.01%+69913F-HRTimelineGroup
LPL Financial LLC5,077$389K<0.01%-1,76913F-HRTimeline
Bell & Brown Wealth Advisors, LLC4,966$380K0.12%-113F-HR/ATimeline
Cetera Investment Advisers4,859$372K<0.01%new13F-HRTimeline
HUDSON EDGE INVESTMENT PARTNERS INC.4,316$330K0.05%-27713F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA4,176$319K<0.01%-42813F-HRTimelineGroup
Quantbot Technologies LP4,103$314K0.01%-12,86813F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…4,052$310K<0.01%013F-HRTimelineGroup
DIVERSIFIED TRUST CO3,823$293K0.01%+2513F-HRTimeline
OXFORD ASSET MANAGEMENT LLP3,632$278K0.1%-1,60513F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Maryland State Retirement & Pension Sys…3,612$276K0.01%+4213F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC3,461$265K<0.01%-10,08113F-HRTimelineGroup
Polymer Capital Management (US) LLC3,458$265K0.03%-1,45213F-HRTimeline
MEEDER ASSET MANAGEMENT INCin group Meeder Advisory Services, Inc.3,425$262K0.01%-2,81313F-HRTimelineGroup
CAPTRUST FINANCIAL ADVISORS3,360$257K<0.01%+40613F-HRTimeline
PROFUND ADVISORS LLC3,042$233K0.01%new13F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…3,018$231K<0.01%013F-HRTimeline
MACKENZIE FINANCIAL CORP2,960$231K<0.01%-19613F-HRTimeline
Aigen Investment Management, LP2,980$228K0.05%-3,76313F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC2,834$217K<0.01%new13F-HRTimelineGroup
PharVision Advisers, LLC2,817$216K0.11%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…2,361$181K<0.01%+69213F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,330$178K<0.01%-18713F-HRTimelineGroup
State of Wyoming2,186$167K0.02%+2,01413F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,099$161K<0.01%013F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC1,934$148K<0.01%+1713F-HRTimeline
Smartleaf Asset Management LLC1,665$130K<0.01%+34813F-HRTimeline
Sterling Capital Management LLC1,367$105K<0.01%-28713F-HRTimeline
Ensign Peak Advisors, Inc1,209$92.5K<0.01%-3,80013F-HR/ATimeline
SIGNATUREFD, LLC993$76K<0.01%+39313F-HRTimeline
Murphy & Mullick Capital Management Corp962$73.6K0.05%013F-HRTimeline
MAI Capital Management956$73.2K<0.01%+5613F-HRTimeline
HM PAYSON & CO909$69.6K<0.01%013F-HRTimeline
DekaBank Deutsche Girozentrale515$68K<0.01%013F-HRTimeline
Allworth Financial LP880$67.4K<0.01%+29213F-HRTimeline
KBC Group NVin group KBC Group NV860$66K<0.01%013F-HRTimelineGroup
Eurizon Capital SGR S.p.A.804$62.8K<0.01%13F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…728$55.7K<0.01%+40513F-HR/ATimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…683$52.3K<0.01%+9013F-HRTimelineGroup
Caitong International Asset Management …662$50.7K0.01%+50313F-HR/ATimeline
DANSKE BANK A/S600$45.9K<0.01%013F-HRTimeline
HANTZ FINANCIAL SERVICES, INC.575$44K<0.01%+42013F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Essential Partners LLC477$36.5K0.01%-42413F-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