As of November 6, 2026, Innospec Inc is a publicly traded company (Nasdaq: IOSP); its largest reported holder is Vanguard, with 7.51% on Schedule 13G of April 29, 2026, then Dimensional (5.3%). The largest insider holding is Patrick Williams, the chief executive and president, with 231,535 shares (0.94% of shares outstanding), per Form 4 of March 3, 2026 (Schedule 13G, April 29, 2026).
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Is Innospec Inc a real, registered company?
- Innospec Inc files with the SEC under CIK 1054905 (its SEC filings).
- Its shares are listed under the ticker IOSP on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in Englewood, Colorado, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Innospec Inc in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Allspring Global Investments Holdings, LLC (filed 2026-07-31).
Who are Innospec Inc's owners and officers?
Innospec Inc: incorporated in Delaware; business address in Englewood, Colorado; industry Chemicals & Allied Products (Schedule 13G/A, 2026-10-07).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-07 | Allspring Global Investments Holdings, LLC | 4.7% |
| Schedule 13G, 2026-10-07 | Allspring Global Investments Holdings, LLC | 4.7% |
| Schedule 13G/A, 2026-07-31 | Allspring Global Investments Holdings, LLC | 7.7% |
| Schedule 13G, 2026-07-14 | Dimensional Fund Advisors LP | 5.3% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.22% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 7.51% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
Questions about who owns Innospec Inc
Who owns Innospec Inc?
On this page, 3 holders' latest ownership filings report 5% or more of Innospec Inc: Vanguard Portfolio Management (7.51%, Schedule 13G, filed 2026-04-29), Dimensional Fund Advisors LP (5.3%, Schedule 13G, filed 2026-07-14) and Vanguard Capital Management (5.22%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Innospec Inc?
By the share each holder's latest filing reports, the largest holders of Innospec Inc on this page are Vanguard Portfolio Management (7.51%), Dimensional Fund Advisors LP (5.3%) and Vanguard Capital Management (5.22%).
When did Vanguard Portfolio Management buy into Innospec Inc?
The filings give report dates, not purchase dates. The earliest filing from Vanguard Portfolio Management on this page is the Schedule 13G, filed 2026-04-29, reporting 7.51%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 7 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on Innospec Inc covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Which insiders own Innospec Inc shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and president: 231,535 shares (0.94% of shares outstanding) (Form 4, 2026-03-03).
- , the chief financial officer and executive vice president: 20,357 shares (0.08% of shares outstanding) (Form 4/A, 2026-03-06).
- , the executive vice president business operations: 20,079 shares (0.08% of shares outstanding) (Form 4, 2025-02-24).
- , the general counsel and senior vice president: 14,693 shares (0.06% of shares outstanding) (Form 4, 2026-03-03).
- , the senior vice president and corporate dev: 13,079.61 shares (0.05% of shares outstanding) (Form 4, 2026-03-03).
Shares outstanding: 24,631,595 as of 2026-10-31, from the company's latest SEC cover page.
How much has Innospec Inc raised?
No fundraising or offering filing from Innospec Inc is on file with us.
Keep reading
More on Innospec Inc and the records around it.
Companies that share a holder
- Allspring Global Investments Holdings, LLC also filed stake reports on 49 other companies: abrdn Emerging Markets ex Chin (Oct 2026), AMC Global Media Inc (Oct 2026), EverQuote Inc (Oct 2026)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
- Vanguard Portfolio Management also filed stake reports on 941 other companies: Newmark Group Inc (Nov 2026), A10 Networks Inc (Oct 2026), ADT Inc (Oct 2026)
Related pages
Filings, cases and notices link to their records. A not-found line names the records searched; it is not proof of absence.
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Cite this page
https://mentionfox.com/who-owns/innospec