Innospec Inc. SEC filings IOSP
Innospec Inc. has 1,009 filings in SEC EDGAR's recent list, going back to Feb 28, 2011. Its latest annual report, Form ARS, was filed on Mar 24, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 3, 2026 (results of operations, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 7, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 7, 2026 | — |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 31, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 14, 2026 | — |
| 3 | Initial insider ownership | Jul 1, 2026 | Jul 1, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| 4/A | Filing | Mar 6, 2026 | Feb 27, 2026 |
| 4/A | Filing | Mar 6, 2026 | Feb 27, 2026 |
| 4/A | Filing | Mar 6, 2026 | Feb 27, 2026 |
| 4/A | Filing | Mar 6, 2026 | Feb 27, 2026 |
| 4/A | Filing | Mar 6, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 16, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 16, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 16, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 16, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 16, 2026 |
| 5 | Annual insider ownership | Feb 17, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Nov 17, 2025 | Nov 14, 2025 |
| 4 | Insider transaction | May 15, 2025 | May 13, 2025 |
| 4 | Insider transaction | May 15, 2025 | May 13, 2025 |
| 4 | Insider transaction | May 15, 2025 | May 13, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 13, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 30, 2025 | — |
| 4 | Insider transaction | Mar 4, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 27, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2025 | — |
| 4 | Insider transaction | Jan 30, 2025 | Nov 18, 2024 |
| 4 | Insider transaction | Jan 30, 2025 | Nov 18, 2024 |
| 4 | Insider transaction | Nov 25, 2024 | Nov 22, 2024 |
| 4 | Insider transaction | Nov 14, 2024 | Nov 13, 2024 |
| 4 | Insider transaction | Aug 27, 2024 | Aug 23, 2024 |
| 4 | Insider transaction | Aug 14, 2024 | Aug 13, 2024 |
| 4 | Insider transaction | May 22, 2024 | May 20, 2024 |
| 4 | Insider transaction | May 20, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 16, 2024 | May 14, 2024 |
| 4 | Insider transaction | May 16, 2024 | May 14, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Mar 1, 2024 | Feb 29, 2024 |
| 4 | Insider transaction | Mar 1, 2024 | Feb 29, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 27, 2024 | Feb 26, 2024 |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 22, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 12, 2024 | — |
| 4 | Insider transaction | Nov 15, 2023 | Nov 13, 2023 |
| 4 | Insider transaction | Nov 13, 2023 | Nov 10, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | May 24, 2023 | May 22, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 11, 2023 | May 10, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | May 4, 2023 | — |
| 4 | Insider transaction | Mar 20, 2023 | Mar 17, 2023 |
| 4 | Insider transaction | Mar 9, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Mar 9, 2023 | Mar 7, 2023 |
| 4 | Insider transaction | Mar 9, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Mar 9, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Mar 6, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Mar 1, 2023 |
| 4 | Insider transaction | Mar 2, 2023 | Mar 2, 2023 |
| 4 | Insider transaction | Mar 1, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 1, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 1, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 1, 2023 | Feb 27, 2023 |
| 4 | Insider transaction | Mar 1, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Mar 1, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Mar 1, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 24, 2023 |
| 4 | Insider transaction | Feb 22, 2023 | Feb 20, 2023 |
| 4 | Insider transaction | Feb 22, 2023 | Feb 20, 2023 |
| 4 | Insider transaction | Feb 22, 2023 | Feb 20, 2023 |
| 4 | Insider transaction | Feb 22, 2023 | Feb 20, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Feb 8, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 31, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 26, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 20, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 13, 2023 | — |
| 4 | Insider transaction | Dec 6, 2022 | Dec 5, 2022 |
| 4 | Insider transaction | Nov 21, 2022 | Nov 17, 2022 |
| 4 | Insider transaction | Nov 21, 2022 | Nov 17, 2022 |
| 4 | Insider transaction | May 9, 2022 | May 6, 2022 |
| 4 | Insider transaction | Mar 15, 2022 | Mar 11, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 23, 2006 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 21, 2022 |
| 4 | Insider transaction | Feb 23, 2022 | Feb 21, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 8, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 8, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 27, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 26, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 21, 2022 | — |
| 3 | Initial insider ownership | Jan 19, 2022 | Jan 3, 2022 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Chemicals & Allied Products (SIC 2800)
- Listed as
- IOSP (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Englewood, CO
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1054905
- Former names
- OCTEL CORP (until Jan 9, 2006)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.