IOSP · Innospec Inc. · Shareholders & Ownership
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.”
Every disclosed holder of IOSP in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns IOSP
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 24,963,980 | 101.35% |
| Insiders (Forms 3, 4, 5) | 357,779 | 1.45% |
| 13D/G-only blocks | 0 | 0.00% |
| Remaining | 690,712 | -2.80% |
| Registered funds (N-PORT, not summed) | 13,320,747 | 54.08% |
Shares outstanding: 24,631,047, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of IOSP
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,381,323 | ||
| 1.1 |
iShares Core S&P Small-Cap ETF
Fund
S000004313 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,484,268 | ||
| 1.2 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
653,783 | ||
| 1.3 |
iShares Russell 2000 Value ETF
Fund
S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
236,176 | ||
| 1.4 |
iShares S&P Small-Cap 600 Value ETF
Fund
S000004316 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
212,067 | ||
| 1.5 |
BlackRock Advantage Small Cap Core Fund
Fund
S000039982 · Registered fund · May 29, 2026
BlackRock Funds, not summed
|
87,320 | ||
| 2 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,884,244 | ||
| 3 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,305,038 | ||
| 3.1 |
DIMENSIONAL FUND ADVISORS LP
13G
CIK 354204 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
1,305,038 | ||
| 3.2 |
U.S. Targeted Value Portfolio
Fund
S000000970 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
201,662 | ||
| 3.3 |
U.S. SMALL CAP VALUE PORTFOLIO
Fund
S000000987 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
200,522 | ||
| 3.4 |
Dimensional U.S. Targeted Value ETF
Fund
S000070901 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
161,183 | ||
| 3.5 |
Dimensional US Small Cap Value ETF
Fund
S000075151 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
112,508 | ||
| 4 |
Allspring Global Investments Holdings, LLC
13G
CIK 1890906 · Holding company · Sep 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
1,161,421 | ||
| 4.1 |
Allspring Global Investments Holdings, LLC
13F
CIK 1890906 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,892,471 | ||
| 4.2 |
Allspring Special Small Cap Value Fund
Fund
S000029108 · Registered fund · Jun 30, 2026
ALLSPRING FUNDS TRUST, not summed
|
1,207,431 | ||
| 4.3 |
Allspring Special Global Small Cap Fund
Fund
S000029113 · Registered fund · Jul 31, 2026
ALLSPRING FUNDS TRUST, not summed
|
32,450 | ||
| 5 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,108,107 | ||
| 6 |
|
996,027 | ||
| 6.1 |
State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF
Fund
S000041317 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
226,547 | ||
| 6.2 |
State Street(R) SPDR(R) S & P 600(TM) Small Cap Value ETF
Fund
S000006974 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
127,709 | ||
| 6.3 |
State Street(R) SPDR(R) US Small Cap Low Volatility Index ETF
Fund
S000039795 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
8,948 | ||
| 6.4 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
7,595 | ||
| 6.5 |
State Street(R) SPDR(R) Portfolio S&P 1500(R) Composite Stock Market ETF
Fund
S000006973 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
5,326 | ||
| 7 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
782,414 | ||
| 8 |
|
755,723 | ||
| 8.1 |
College Retirement Equities Fund - Total Global Stock Account
Fund
S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
|
282,945 | ||
| 8.2 |
Nuveen Quant Small Cap Equity Fund
Fund
S000005386 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
139,740 | ||
| 8.3 |
Nuveen Multi Cap Value Fund
Fund
S000000605 · Registered fund · Jun 30, 2026
Nuveen Investment Trust, not summed
|
108,679 | ||
| 8.4 |
Nuveen Quant Small/Mid Cap Equity Fund
Fund
S000054623 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
91,820 | ||
| 8.5 |
Nuveen Small Cap Blend Index Fund
Fund
S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
31,838 | ||
| 9 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
666,589 | ||
| 10 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
662,210 | ||
| 10.1 |
Goldman Sachs Small Cap Value Insights Fund
Fund
S000014929 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
91,304 | ||
| 10.2 |
Goldman Sachs Small Cap Equity Insights Fund
Fund
S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
52,514 | ||
| 10.3 |
Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund
Fund
S000009355 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
|
15,415 | ||
| 10.4 |
Goldman Sachs Small Cap Growth Insights Fund
Fund
S000014930 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
9,028 | ||
| 10.5 |
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund
S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
6,953 | ||
| 11 |
VICTORY CAPITAL MANAGEMENT INC
13F
CIK 1040188 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
660,110 | ||
| 11.1 |
Victory Sycamore Small Company Opportunity Fund
Fund
S000000800 · Registered fund · Jun 30, 2026
Victory Portfolios, not summed
|
490,000 | ||
| 11.2 |
Victory Extended Market Index Fund
Fund
S000012941 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
|
2,801 | ||
| 12 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
568,709 | ||
| 13 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
564,509 | ||
| 14 |
AQR CAPITAL MANAGEMENT LLC
13F
CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
482,545 | ||
| 14.1 |
AQR Small Cap Multi-Style Fund
Fund
S000040064 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
4,611 | ||
| 15 |
BROWN ADVISORY INC
13F
CIK 1345929 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
408,468 | ||
| 15.1 |
Brown Advisory Small-Cap Fundamental Value Fund
Fund
S000038484 · Registered fund · Jun 30, 2026
Brown Advisory Funds, not summed
|
218,227 | ||
| 16 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
370,574 | ||
| 17 |
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund
S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
357,834 | ||
| 18 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
355,658 | ||
| 18.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
118,809 | ||
| 18.2 |
Schwab Fundamental U.S. Small Company ETF
Fund
S000040878 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
105,322 | ||
| 18.3 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
61,215 | ||
| 18.4 |
Schwab Fundamental U.S. Small Company Index Fund
Fund
S000016767 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
26,821 | ||
| 18.5 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
14,629 | ||
| 19 |
WASATCH ADVISORS LP
13F
CIK 814133 · Registered investment adviser · Sep 30, 2026
|
335,398 | ||
| 20 |
GENDELL JEFFREY L
13F
CIK 1056581 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
324,504 | ||
| 21 |
Assenagon Asset Management S.A.
13F
CIK 1546007 · Unknown · Sep 30, 2026
|
319,633 | ||
| 22 |
ROYCE & ASSOCIATES LP
13F
CIK 906304 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
308,726 | ||
| 22.1 |
Royce Small-Cap Fund
Fund
S000009507 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
|
94,266 | ||
| 22.2 |
Royce Premier Fund
Fund
S000009505 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
|
72,524 | ||
| 22.3 |
Royce Small-Cap Special Equity Fund
Fund
S000009513 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
|
21,000 | ||
| 23 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
303,044 | ||
| 23.1 |
Small Cap Value Fund
Fund
S000001246 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
23,995 | ||
| 23.2 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
12,775 | ||
| 23.3 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
2,941 | ||
| 23.4 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
1,458 | ||
| 24 |
Brighthouse Small Cap Value Portfolio
Fund
S000011105 · Registered fund · Jun 30, 2026
Brighthouse Funds Trust I, not summed
|
288,354 | ||
| 25 |
Qube Research & Technologies Ltd
13F
CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
285,849 | ||
| 26 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
282,511 | ||
| 27 |
ACADIAN ASSET MANAGEMENT LLC
13F
CIK 916542 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
273,999 | ||
| 28 |
Western Standard LLC
13F
CIK 1517666 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
236,833 | ||
| 29 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
235,742 | ||
| 30 |
|
231,535 | ||
| 31 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
230,793 | ||
| 31.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
4 | ||
| 32 |
RENAISSANCE TECHNOLOGIES LLC
13F
CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
185,000 | ||
| 33 |
PANAGORA ASSET MANAGEMENT INC
13F
CIK 883677 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
182,538 | ||
| 34 |
VANGUARD TAX-MANAGED SMALL-CAP FUND
Fund
S000004387 · Registered fund · Jun 30, 2026
VANGUARD TAX-MANAGED FUNDS, not summed
|
166,911 | ||
| 35 |
D. E. Shaw & Co., Inc.
13F
CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
165,746 | ||
| 36 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
163,715 | ||
| 37 |
SEI INVESTMENTS CO
13F
CIK 350894 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
156,051 | ||
| 37.1 |
SIIT EXTENDED MARKET INDEX FUND
Fund
S000035814 · Registered fund · May 31, 2026
SEI INSTITUTIONAL INVESTMENTS TRUST, not summed
|
3,813 | ||
| 37.2 |
SIIT SMALL CAP II FUND
Fund
S000036633 · Registered fund · May 31, 2026
SEI INSTITUTIONAL INVESTMENTS TRUST, not summed
|
2,158 | ||
| 37.3 |
Catholic Values Equity Fund
Fund
S000048320 · Registered fund · May 31, 2026
SEI CATHOLIC VALUES TRUST, not summed
|
1,185 | ||
| 37.4 |
New Covenant Growth Fund
Fund
S000024941 · Registered fund · Jun 30, 2026
NEW COVENANT FUNDS, not summed
|
499 | ||
| 38 |
|
154,001 | ||
| 39 |
FIRST WILSHIRE SECURITIES MANAGEMENT INC
13F
CIK 732847 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
147,112 | ||
| 40 |
MACKENZIE FINANCIAL CORP
13F
CIK 919859 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
144,677 | ||
| 41 |
VANGUARD DIVIDEND APPRECIATION INDEX FUND
Fund
S000011322 · Registered fund · Jul 31, 2026
VANGUARD SPECIALIZED FUNDS, not summed
|
139,314 | ||
| 42 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
137,261 | ||
| 43 |
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC
13F
CIK 1164833 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
135,740 | ||
| 43.1 |
Hotchkis and Wiley Small Cap Diversified Value Fund
Fund
S000045868 · Registered fund · Jun 30, 2026
HOTCHKIS & WILEY FUNDS/DE/, not summed
|
37,500 | ||
| 43.2 |
Hotchkis & Wiley SMID Cap Diversified Value Fund
Fund
S000091359 · Registered fund · Jun 30, 2026
HOTCHKIS & WILEY FUNDS/DE/, not summed
|
104 | ||
| 44 |
Jupiter Topco LLC
13F
CIK 2146052 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
127,976 | ||
| 44.1 |
Janus Henderson Small Cap Value Fund
Fund
S000010480 · Registered fund · Jun 30, 2026
Janus Investment Fund, not summed
|
105,607 | ||
| 45 |
VANGUARD RUSSELL 2000 INDEX FUND
Fund
S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
|
127,602 | ||
| 46 |
Leeward Investments, LLC - MA
13F
CIK 1923173 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
125,308 | ||
| 47 |
PRINCIPAL FINANCIAL GROUP INC
13F
CIK 1126328 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
119,053 | ||
| 47.1 |
SmallCap Value Fund II
Fund
S000007169 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
21,905 | ||
| 47.2 |
SmallCap S&P 600 Index Fund
Fund
S000007203 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
18,147 | ||
| 48 |
Russell Investments Group, Ltd.
13F
CIK 1692234 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
118,614 | ||
| 48.1 |
U.S. Small Cap Equity Fund
Fund
S000001586 · Registered fund · Jul 31, 2026
RUSSELL INVESTMENT CO, not summed
|
33,680 | ||
| 48.2 |
U.S. Small Cap Equity Fund
Fund
S000006864 · Registered fund · Jun 30, 2026
RUSSELL INVESTMENT FUNDS, not summed
|
8,050 | ||
| 48.3 |
Tax-Managed U.S. Mid & Small Cap Fund
Fund
S000001571 · Registered fund · Jul 31, 2026
RUSSELL INVESTMENT CO, not summed
|
4,161 | ||
| 48.4 |
Russell Investments U.S. Small Cap Equity ETF
Fund
S000089990 · Registered fund · Jun 30, 2026
Russell Investments Exchange Traded Funds, not summed
|
2,006 | ||
| 49 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
118,427 | ||
| 49.1 |
Invesco S&P SmallCap 600 Revenue ETF
Fund
S000064596 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
28,374 | ||
| 49.2 |
Invesco RAFI US 1500 Small-Mid ETF
Fund
S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
26,371 | ||
| 49.3 |
Invesco S&P SmallCap Low Volatility ETF
Fund
S000030965 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
25,502 | ||
| 49.4 |
Invesco S&P SmallCap Materials ETF
Fund
S000028302 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
6,838 | ||
| 49.5 |
Invesco S&P SmallCap High Dividend Low Volatility ETF
Fund
S000055539 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
6,261 | ||
| 50 |
ZWJ INVESTMENT COUNSEL INC
13F
CIK 842782 · Registered investment adviser · Sep 30, 2026
|
114,933 |
48 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
Showing 1–50 of 415 holders
Create a free account to page through every holder, filter by source and group by ultimate parent.