Innospec Inc.
IOSP- Exchange
- Nasdaq
- Industry
- Chemicals & Allied Products
- SEC CIK
- 0001054905
No open-market purchases or sales by Innospec Inc. insiders were filed in the last 90 days; 281 institutions reported holding it in 13F filings for Q2 2026, worth $2.00B in total; no superinvestor holds it.
Holders of 5% or more of IOSP
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Innospec Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 14.70%3.68M shares | – | Apr 30, 20251 filing | Apr 30, 2025 | SEC |
| Vanguard Portfolio Management LLC | 13G | 7.51%1.87M shares | New | Apr 29, 20261 filing | Apr 29, 2026 | SEC |
| Vanguard Capital Management LLC | 13G | 5.22%1.30M shares | New | Apr 30, 20261 filing | Apr 30, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
6 Schedule 13D and 13G filings on Innospec Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Apr 30, 202610:36 AM ET | Vanguard Capital Management LLC | 13G | 5.22%1.30M shares | New | Mar 31, 2026 | SEC |
| Apr 29, 20261:54 PM ET | Vanguard Portfolio Management LLC | 13G | 7.51%1.87M shares | New | Mar 31, 2026 | SEC |
| Mar 27, 20269:55 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| May 13, 20253:37 PM ET | Wasatch Advisors Inc | 13G/A | 2.10%528.1K shares | −4.20 ppfrom 6.30%Below 5% | Mar 31, 2025 | SEC |
| Apr 30, 202512:32 PM ET | BlackRock, Inc. | 13G/A | 14.70%3.68M shares | – | Mar 31, 2025 | SEC |
| Feb 12, 202512:35 PM ET | Wasatch Advisors Inc | 13G/A | 6.30%1.58M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Innospec Inc. shares.
No Form 144 notices for Innospec Inc. are on file.