Innospec Inc. (IOSP) Ownership
IOSP ownership summary
as of October 18, 2026- Institutions
- 100.8% of shares outstanding
- Insiders
- 1.35% of shares outstanding
- Shares outstanding
- 24.6M
- Float
- 24.3M shares available to trade
- Short interest
- 2.78% 492K shares short
- Days to cover
- 2.35 short interest down 3.7% vs prior month
- Institutions 100.84%
- Insiders 1.35%
IOSP top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 17.79% | 4.4M | $424.2M | +502,348 (+13.0%) | June 30, 2026 |
| 2 | Allspring Global Investments Holdings, LLC | 7.68% | 1.9M | $183.2M | −423,471 (−18.3%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 7.65% | 1.9M | $182.4M | +24,153 (+1.3%) | June 30, 2026 |
| 4 | Dimensional Fund Advisors, Inc. | 5.30% | 1.3M | $126.3M | +62,949 (+5.1%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 4.50% | 1.1M | $107.3M | −6,491 (−0.6%) | June 30, 2026 |
| 6 | State Street Corp | 4.04% | 996K | $96.4M | +31,692 (+3.3%) | June 30, 2026 |
| 7 | Nuveen, LLC | 3.07% | 756K | $73.2M | +112,475 (+17.5%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 2.71% | 667K | $64.5M | +35,997 (+5.7%) | June 30, 2026 |
| 9 | The Goldman Sachs Group Inc | 2.69% | 662K | $64.1M | +170,199 (+34.6%) | June 30, 2026 |
| 10 | Victory Capital Management Inc. | 2.68% | 660K | $63.9M | −204,884 (−23.7%) | June 30, 2026 |
| 11 | Two Sigma Investments LLC | 2.31% | 569K | $55.1M | −24,330 (−4.1%) | June 30, 2026 |
| 12 | Assenagon Asset Management SA | 2.21% | 546K | $52.8M | +54,680 (+11.1%) | June 30, 2026 |
| 13 | AQR Capital Management LLC | 1.96% | 483K | $46.7M | +170,480 (+54.6%) | June 30, 2026 |
| 14 | Brown Advisory Holdings Inc | 1.66% | 408K | $39.5M | +112,003 (+37.8%) | June 30, 2026 |
| 15 | JPMorgan Chase & Co | 1.50% | 371K | $35.9M | −55,476 (−13.0%) | June 30, 2026 |
| 16 | Charles Schwab Investment Management Inc | 1.44% | 356K | $34.4M | −10,216 (−2.8%) | June 30, 2026 |
| 17 | Gendell Jeffrey L | 1.32% | 325K | $31.4M | +30,000 (+10.2%) | June 30, 2026 |
| 18 | Royce & Associates, LP | 1.25% | 309K | $29.9M | +47,390 (+18.1%) | June 30, 2026 |
| 19 | Northern Trust Corp | 1.23% | 303K | $29.3M | +18,805 (+6.6%) | June 30, 2026 |
| 20 | Qube Research & Technologies | 1.16% | 286K | $27.7M | −120,775 (−29.7%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 1.4M shares and 7 cut 846K.
IOSP top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.95% | 1.5M | $142.0M | +348 (+0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.19% | 785K | $76.0M | −1,762 (−0.2%) | August 31, 2026 |
| 3 | Allspring Special Small Cap Value A | 2.92% | 720K | $69.7M | −185,141 (−20.5%) | September 30, 2026 |
| 4 | iShares Russell 2000 ETF | 2.62% | 645K | $62.4M | −7,424 (−1.1%) | September 30, 2026 |
| 5 | Vanguard Small Cap Index | 2.25% | 555K | $53.7M | −11,796 (−2.1%) | September 30, 2026 |
| 6 | Victory Sycamore Small Company Opp R | 2.03% | 500K | $48.4M | −125,000 (−20.0%) | June 30, 2026 |
| 7 | Vanguard MStar Small Cap Value Index | 1.46% | 361K | $34.9M | +887 (+0.2%) | September 30, 2026 |
| 8 | CREF Total Global Stock Account R3 | 1.23% | 302K | $29.2M | +19,191 (+6.8%) | August 31, 2026 |
| 9 | Brighthouse Small Cap Value A | 1.17% | 288K | $27.9M | −25,024 (−8.0%) | June 30, 2026 |
| 10 | Fidelity Small Cap Index | 1.12% | 276K | $26.7M | +2,119 (+0.8%) | July 31, 2026 |
| 11 | Brown Advisory Small-Cap Fdmtl Val Inv | 1.00% | 246K | $23.8M | −3,135 (−1.3%) | September 30, 2026 |
| 12 | iShares Russell 2000 Value ETF | 0.95% | 233K | $22.6M | +354 (+0.2%) | September 30, 2026 |
| 13 | State Street SPDR Port S&P 600 Sm CpETF | 0.91% | 224K | $21.6M | — | September 30, 2026 |
| 14 | DFA US Small Cap Value I | 0.90% | 222K | $21.5M | +20,382 (+10.1%) | August 31, 2026 |
| 15 | iShares S&P Small-Cap 600 Value ETF | 0.85% | 208K | $20.2M | — | September 30, 2026 |
| 16 | DFA US Targeted Value I | 0.82% | 202K | $19.5M | — | August 31, 2026 |
| 17 | Vanguard Tax-Managed Small Cap Adm | 0.68% | 167K | $16.2M | — | September 30, 2026 |
| 18 | Dimensional US Targeted Value ETF | 0.65% | 161K | $15.6M | — | September 30, 2026 |
| 19 | Vanguard Russell 2000 ETF | 0.59% | 145K | $14.0M | +77 (+0.1%) | September 30, 2026 |
| 20 | Nuveen Quant Small Cap Equity R6 | 0.57% | 140K | $13.5M | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
IOSP insider transactions
latest 9| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-03 | David B Jones | Sell | $75.64 | 1,028 | $77,758 |
| 2026-02-27 | Claudia Poccia | Sell | $76.56 | 119 | $9,111 |
| 2026-02-27 | David Landless | Sell | $76.56 | 594 | $45,477 |
| 2026-02-27 | Larry Padfield | Sell | $76.56 | 594 | $45,477 |
| 2026-02-27 | Milton C Blackmore | Sell | $76.56 | 594 | $45,477 |
| 2026-02-20 | Larry Padfield | Sell | $81.84 | 1,030 | $84,295 |
| 2026-02-20 | Milton C Blackmore | Sell | $81.84 | 1,030 | $84,295 |
| 2025-11-14 | Leslie J Parrette | Buy | $74.09 | 340 | $25,191 |
| 2025-05-13 | Leslie J Parrette | Sell | $90.63 | 446 | $40,421 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
IOSP shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns IOSP
Institutional investors own 100.8% of Innospec's shares and insiders 1.35%. The largest holder is BlackRock Inc with 17.79% of the shares (4.4M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 7 reduced their stake in the latest filings. Short interest is 2.78% of the float, or 2.35 days of average trading volume. The share count fell 1.1% since 2014.
Related: IOSP analyst forecast, IOSP key metrics, IOSP dividend history. See the IOSP stock overview for the latest quote and news.
IOSP ownership FAQ
Who owns the most Innospec stock?
The largest shareholders of Innospec are BlackRock Inc (17.79%), Allspring Global Investments Holdings, LLC (7.68%), Vanguard Portfolio Management, LLC (7.65%), Dimensional Fund Advisors, Inc. (5.30%), Vanguard Capital Management, LLC (4.50%).
What percentage of Innospec is owned by institutions?
Institutions hold 100.8% of Innospec's shares outstanding; insiders hold 1.35%.
Which funds own Innospec?
The largest fund holders of Innospec are iShares Core S&P Small-Cap ETF (5.95%), Vanguard MStar Total Stk Mkt Idx Invest (3.19%), Allspring Special Small Cap Value A (2.92%), iShares Russell 2000 ETF (2.62%), Vanguard Small Cap Index (2.25%).
What is Innospec's short interest?
492K shares of Innospec were sold short, 2.78% of the float; at the average daily volume it would take 2.35 days to cover.
Are insiders buying or selling Innospec?
Of the latest 9 reported insider transactions in Innospec (since May 13, 2025), 1 were purchases and 8 were sales.
How many shares of Innospec are outstanding?
Innospec has 24.6M shares outstanding, of which 24.3M are in the public float.