Innospec Inc
Ownership
Ownership Structure
Who owns Innospec Inc (IOSP)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.7% of the shares are freely tradable; institutional investors hold 104.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 15.75 | 3,878,975 | +5.9 | 03/31/2026 |
| Allspring Global Investments Holdings, LLC | 7.68 | 1,892,471 | -18.3 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 7.55 | 1,860,091 | +0.0 | 03/31/2026 |
| Dimensional Fund Advisors, Inc. | 5.30 | 1,305,038 | +5.1 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.53 | 1,114,598 | +0.0 | 03/31/2026 |
| State Street Corp | 3.92 | 964,335 | +1.6 | 03/31/2026 |
| Victory Capital Management Inc. | 2.68 | 660,110 | -23.7 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 6.10 | 1,501,474 | +0.0 | 08/31/2026 |
| Allspring Special Small Cap Value A | 3.68 | 905,228 | -18.3 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.19 | 786,944 | +0.5 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.