IOSP · Innospec Inc. · Holdings
One customer — 13.6% of revenue (2023)
“In 2023, the Company had a significant customer in the Oilfield Services segment which accounted for $265.2 million and 13.6% of the group's net sales.”
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding IOSP
All superinvestors →Holder Concentration
Across 281 13F filersWho Holds IOSP
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 281 filers, like-for-like change -1.3%; actively managed books -7.4%; index-like books +9.5%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 42.6% | 145 | +2.4% |
| Exempt adviser | 1.4% | 4 | -32.9% |
| Adviser | 0.9% | 5 | +11.0% |
| Bank | 9.3% | 17 | -16.2% |
| Insurer | 0.6% | 2 | -0.8% |
| Broker-dealer | 0.0% | 1 | +5.6% |
| Benefit plan | 0.5% | 6 | -8.4% |
| Non-US | 1.0% | 9 | -12.3% |
| Holding company | 30.1% | 9 | +3.6% |
| Unknown | 13.4% | 83 | -5.2% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 40.1% | 34 | +9.5% |
| Systematic-like | 6.5% | 25 | -33.6% |
| Concentrated | 3.0% | 48 | +17.5% |
| Diversified active | 50.5% | 174 | -3.7% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 54.3% | 162 | +9.7% |
| Medium turnover | 22.4% | 53 | -6.1% |
| High turnover | 9.8% | 44 | -32.3% |
| Unknown | 13.5% | 22 | +0.5% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 15.7% | 39 | -0.1% |
| Medium horizon | 22.0% | 45 | +11.3% |
| Long horizon | 56.9% | 182 | -2.8% |
| Unknown | 5.4% | 15 | -25.7% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 2.0% | 50 | -4.2% |
| $1B to $10B | 3.8% | 73 | -6.1% |
| $10B to $100B | 23.2% | 94 | -6.3% |
| $100B or more | 71.0% | 64 | +0.9% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 2.5% | 67 | +21.4% |
| Pooled investment vehicles | 7.4% | 33 | -6.1% |
| Registered funds and BDCs | 27.5% | 18 | +0.4% |
| Pension and profit sharing plans | 0.0% | 2 | +76.6% |
| Insurance companies | 0.2% | 3 | +3.9% |
| Charitable organizations | 0.0% | 1 | new |
| Governments and sovereign funds | 1.3% | 3 | +1.9% |
| Other investment advisers | 0.0% | 4 | -24.6% |
| Other | 0.1% | 1 | -2.2% |
| Diversified | 3.5% | 12 | +35.0% |
| Unknown | 57.5% | 137 | -3.8% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 13.2% | 47 | -3.3% |
| Private equity funds | 3.4% | 11 | -13.4% |
| Venture capital funds | 0.0% | 1 | +12.6% |
| Real estate funds | 0.0% | 4 | +158.7% |
| Securitized asset funds | 0.3% | 1 | -1.3% |
| Other private funds | 8.0% | 14 | +14.1% |
| Mixed private funds | 0.1% | 1 | +8.0% |
| No private funds | 18.9% | 69 | +1.7% |
| Private funds, type not stated | 0.0% | 0 | -100.0% |
| Unknown | 56.1% | 133 | -2.8% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 94.3% | 237 | +1.8% |
| Outside the US | 5.7% | 44 | -33.9% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 2 holders with no observed 2026-03-31 13F and 2 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
281 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 22.0% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies IOSP's active holders also own, quarter ended Jun 30, 2026Shareholder Targets
13F filers that own its peers but not IOSP, quarter ended Jun 30, 2026Found through its holder-overlap peers: AVNW, ORN, EZPW, POR, J, DTE, HAL, CRS, EQT, Q, YUM, NOC, AEP, EOG, PFE, C, MSFT, SBUX, HD, WFC. 6,447 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Capital Research Global Investors Adviser, Diversified active | $64,543,435,734 11 held | MSFT, SBUX, WFC |
| 2 | NORGES BANK Non-US, Index-like | $54,878,164,968 11 held | MSFT, HD, WFC |
| 3 | Capital World Investors Adviser, Diversified active | $52,481,387,115 15 held | MSFT, SBUX, EOG |
| 4 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $31,952,485,144 15 held | MSFT, WFC, HD |
| 5 | Capital International Investors Adviser, Diversified active | $30,014,752,627 9 held | MSFT, NOC, YUM |
| 6 | Fisher Asset Management, LLC Adviser, Diversified active | $22,889,504,220 16 held | MSFT, C, HD |
| 7 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser, Diversified active | $14,727,686,558 15 held | MSFT, C, PFE |
| 8 | RAYMOND JAMES FINANCIAL INC Unknown, Diversified active | $12,399,414,286 18 held | MSFT, HD, WFC |
| 9 | Sumitomo Mitsui Trust Group, Inc. Bank, Index-like | $9,997,294,847 15 held | MSFT, HD, C |
| 10 | California Public Employees Retirement System Unknown, Diversified active | $9,399,126,204 17 held | MSFT, C, HD |
Fund Ownership of IOSP by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 30.09% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 5.07% | 1,247,671 |
| Index ETFs | 25.02% | 6,162,818 |
| Active ETFs | 2.28% | 562,011 |
| Active funds | 21.08% | 5,192,011 |
| Unclassified | 0.34% | 83,743 |
| All registered funds | 53.79% | 13,248,254 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $356,595,872 | 17.44% | 4,381,323 | Shares | 2026-08-07 | |
| Large Allspring Global Investments Holdings, LLC Holding company | $154,028,213 | 7.53% | 1,892,471 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $153,358,619 | 7.50% | 1,884,244 | Shares | 2026-08-13 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $106,217,042 | 5.19% | 1,305,038 | Shares | 2026-08-11 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $90,188,828 | 4.41% | 1,108,107 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP Bank | $81,066,637 | 3.96% | 996,027 | Shares | 2026-09-22 | |
| Mega Nuveen, LLC | $61,508,293 | 3.01% | 755,723 | Shares | 2026-08-11 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $54,253,677 | 2.65% | 666,589 | Shares | 2026-08-12 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $53,897,270 | 2.64% | 662,210 | Shares | 2026-08-14 | |
| Mega VICTORY CAPITAL MANAGEMENT INC Registered adviser | $53,726,352 | 2.63% | 660,110 | Shares | 2026-08-07 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $46,287,225 | 2.26% | 568,709 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $39,274,334 | 1.92% | 482,545 | Shares | 2026-08-14 | |
| Large BROWN ADVISORY INC | $33,245,210 | 1.63% | 408,468 | Shares | 2026-08-14 | |
| Large WASATCH ADVISORS LP Registered adviser | $31,970,137 | 1.56% | 335,398 | Shares | 2026-10-13 | |
| Large Assenagon Asset Management S.A. | $30,467,417 | 1.49% | 319,633 | Shares | 2026-10-15 | |
| Mega JPMORGAN CHASE & CO Bank | $30,161,016 | 1.47% | 370,574 | Shares | 2026-08-12 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $28,947,004 | 1.42% | 355,658 | Shares | 2026-08-14 | |
| Large GENDELL JEFFREY L | $26,411,380 | 1.29% | 324,504 | Shares | 2026-08-14 | |
| Large ROYCE & ASSOCIATES LP Registered adviser | $25,127,209 | 1.23% | 308,726 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $24,664,749 | 1.21% | 303,044 | Shares | 2026-08-13 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $23,265,250 | 1.14% | 285,849 | Shares | 2026-08-14 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $22,300,778 | 1.09% | 273,999 | Shares | 2026-08-13 | |
| Small Western Standard LLC Registered adviser | $19,275,837 | 0.94% | 236,833 | Shares | 2026-08-10 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $19,187,039 | 0.94% | 235,742 | Shares | 2026-08-14 | |
| Mega MORGAN STANLEY Holding company | $18,784,239 | 0.92% | 230,793 | Shares | 2026-08-13 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $15,057,150 | 0.74% | 185,000 | Shares | 2026-08-13 | |
| Large PANAGORA ASSET MANAGEMENT INC Registered adviser | $14,856,767 | 0.73% | 182,538 | Shares | 2026-08-06 | |
| Mega D. E. Shaw & Co., Inc. | $13,490,066 | 0.66% | 165,746 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $13,324,763 | 0.65% | 163,715 | Shares | 2026-08-13 | |
| Mega SEI INVESTMENTS CO Holding company | $12,700,990 | 0.62% | 156,051 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $12,534,140 | 0.61% | 154,001 | Shares | 2026-08-13 | |
| Small FIRST WILSHIRE SECURITIES MANAGEMENT INC Registered adviser | $11,973,445 | 0.59% | 147,112 | Shares | 2026-08-14 | |
| Large MACKENZIE FINANCIAL CORP Registered adviser | $11,775,261 | 0.58% | 144,677 | Shares | 2026-08-13 | |
| Mega Bank of New York Mellon Corp Bank | $11,171,669 | 0.55% | 137,261 | Shares | 2026-08-06 | |
| Large HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC Registered adviser | $11,047,878 | 0.54% | 135,740 | Shares | 2026-08-14 | |
| Mid ZWJ INVESTMENT COUNSEL INC Registered adviser | $10,955,413 | 0.54% | 114,933 | Shares | 2026-10-15 | |
| Mega Jupiter Topco LLC | $10,415,965 | 0.51% | 127,976 | Shares | 2026-08-14 | |
| Mid Leeward Investments, LLC - MA Registered adviser | $10,198,818 | 0.50% | 125,308 | Shares | 2026-07-30 | |
| Mega PRINCIPAL FINANCIAL GROUP INC Insurer | $9,689,723 | 0.47% | 119,053 | Shares | 2026-08-04 | |
| Mega Russell Investments Group, Ltd. | $9,653,991 | 0.47% | 118,614 | Shares | 2026-08-06 | |
| Mega Invesco Ltd. Adviser | $9,638,772 | 0.47% | 118,427 | Shares | 2026-08-14 | |
| Mid DEPRINCE RACE & ZOLLO INC Registered adviser | $8,493,202 | 0.42% | 89,102 | Shares | 2026-10-13 | |
| Mega Creative Planning Registered adviser | $8,482,791 | 0.41% | 104,224 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $8,020,902 | 0.39% | 98,549 | Shares | 2026-09-02 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $7,426,999 | 0.36% | 91,252 | Shares | 2026-08-11 | |
| Large TEACHER RETIREMENT SYSTEM OF TEXAS Benefit plan | $6,955,833 | 0.34% | 85,463 | Shares | 2026-08-14 | |
| Large Public Sector Pension Investment Board Non-US | $6,883,722 | 0.34% | 84,577 | Shares | 2026-08-13 | |
| Large HRT FINANCIAL LP | $6,865,165 | 0.34% | 84,349 | Shares | 2026-08-14 | |
| Large MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC Registered adviser | $6,748,858 | 0.33% | 82,920 | Shares | 2026-08-11 | |
| Mega FMR LLC Holding company | $6,735,754 | 0.33% | 82,759 | Shares | 2026-08-13 | |
| Large ProShare Advisors LLC Registered adviser | $6,611,472 | 0.32% | 81,232 | Shares | 2026-08-11 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $5,978,661 | 0.29% | 73,457 | Shares | 2026-08-13 | |
| Mid SG Capital Management LLC Registered adviser | $5,780,480 | 0.28% | 71,022 | Shares | 2026-08-07 | |
| Mid Numerai GP LLC Registered adviser | $5,447,514 | 0.27% | 66,931 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $5,294,826 | 0.26% | 65,055 | Shares | 2026-08-12 | |
| Large Trexquant Investment LP Registered adviser | $4,926,373 | 0.24% | 60,528 | Shares | 2026-08-14 | |
| Large Balyasny Asset Management L.P. Registered adviser | $4,863,133 | 0.24% | 59,751 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $4,789,067 | 0.23% | 58,841 | Shares | 2026-08-14 | |
| Mega AMERICAN CENTURY COMPANIES INC | $4,484,019 | 0.22% | 55,093 | Shares | 2026-08-12 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $4,437,138 | 0.22% | 54,517 | Shares | 2026-08-14 | |
| Mega Swiss National Bank | $4,061,605 | 0.20% | 49,903 | Shares | 2026-08-11 | |
| Large IEQ CAPITAL, LLC Registered adviser | $3,690,466 | 0.18% | 45,343 | Shares | 2026-08-11 | |
| Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Non-US | $3,580,753 | 0.18% | 43,995 | Shares | 2026-08-13 | |
| Large Point72 Asset Management, L.P. Registered adviser | $3,471,120 | 0.17% | 42,648 | Shares | 2026-08-14 | |
| Mid Atom Investors LP Registered adviser | $3,326,409 | 0.16% | 40,870 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $3,216,044 | 0.16% | 39,514 | Shares | 2026-08-13 | |
| Mid DARK FOREST CAPITAL MANAGEMENT LP Registered adviser | $3,162,978 | 0.15% | 38,862 | Shares | 2026-08-14 | |
| Mega FRANKLIN RESOURCES INC Adviser | $3,153,697 | 0.15% | 38,748 | Shares | 2026-08-13 | |
| Large INTECH INVESTMENT MANAGEMENT LLC Registered adviser | $3,116,585 | 0.15% | 38,292 | Shares | 2026-08-10 | |
| Mega SG Americas Securities, LLC Non-US | $3,065,554 | 0.15% | 37,665 | Shares | 2026-08-07 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $3,039,509 | 0.15% | 37,345 | Shares | 2026-08-14 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $2,838,557 | 0.14% | 34,876 | Shares | 2026-08-13 | |
| Small CM Management, LLC | $2,604,480 | 0.13% | 32,000 | Shares | 2026-08-13 | |
| Large VOLORIDGE INVESTMENT MANAGEMENT, LLC Registered adviser | $2,592,841 | 0.13% | 31,857 | Shares | 2026-08-14 | |
| Large Cerity Partners LLC Registered adviser | $2,548,726 | 0.12% | 31,315 | Shares | 2026-08-14 | |
| Mid PDT Partners, LLC Registered adviser | $2,537,414 | 0.12% | 31,176 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $2,459,686 | 0.12% | 30,221 | Shares | 2026-08-14 | |
| Mid Edgestream Partners, L.P. | $2,377,239 | 0.12% | 29,208 | Shares | 2026-08-11 | |
| Small Huber Capital Management LLC Registered adviser | $2,372,355 | 0.12% | 29,148 | Shares | 2026-08-12 | |
| Mid INGALLS & SNYDER LLC Registered adviser | $2,354,368 | 0.12% | 28,927 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $2,329,544 | 0.11% | 28,622 | Shares | 2026-08-14 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $2,259,793 | 0.11% | 27,765 | Shares | 2026-08-24 | |
| Mega DEUTSCHE BANK AG\ Non-US | $2,243,515 | 0.11% | 27,565 | Shares | 2026-08-07 | |
| Large Mariner, LLC Registered adviser | $2,192,239 | 0.11% | 26,935 | Shares | 2026-08-13 | |
| Mega VOYA INVESTMENT MANAGEMENT LLC Registered adviser | $2,109,221 | 0.10% | 25,915 | Shares | 2026-08-12 | |
| Mega CITIGROUP INC Bank | $2,091,070 | 0.10% | 25,692 | Shares | 2026-08-03 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $2,077,805 | 0.10% | 25,529 | Shares | 2026-08-12 | |
| Mega BARCLAYS PLC Bank | $2,011,390 | 0.10% | 24,713 | Shares | 2026-08-14 | |
| Large ExodusPoint Capital Management, LP Registered adviser | $1,937,895 | 0.09% | 23,810 | Shares | 2026-08-14 | |
| Large Holocene Advisors, LP Registered adviser | $1,933,826 | 0.09% | 23,760 | Shares | 2026-08-14 | |
| Mega HSBC HOLDINGS PLC | $1,928,373 | 0.09% | 23,693 | Shares | 2026-08-14 | |
| Mid Moran Wealth Management, LLC Registered adviser | $1,923,977 | 0.09% | 23,639 | Shares | 2026-08-05 | |
| Mid CONNORS INVESTOR SERVICES INC Registered adviser | $1,901,514 | 0.09% | 23,363 | Shares | 2026-08-14 | |
| Large KLP KAPITALFORVALTNING AS | $1,896,387 | 0.09% | 23,300 | Shares | 2026-08-12 | |
| Mega MARSHALL WACE, LLP Exempt adviser | $1,878,073 | 0.09% | 23,075 | Shares | 2026-08-13 | |
| Mid Linden Thomas Advisory Services, LLC Registered adviser | $1,870,940 | 0.09% | 19,628 | Shares | 2026-10-19 | |
| Mid WEDGE CAPITAL MANAGEMENT L L P/NC | $1,827,284 | 0.09% | 19,170 | Shares | 2026-10-13 | |
| Mid XTX Topco Ltd | $1,643,101 | 0.08% | 20,188 | Shares | 2026-08-14 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $1,591,988 | 0.08% | 19,560 | Shares | 2026-08-13 | |
| Large CANADA LIFE ASSURANCE Co | $1,587,756 | 0.08% | 19,508 | Shares | 2026-08-13 |
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