IOSP — INNOSPEC INC
Public company
InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.
Sourced from SEC EDGAR public filings
Why are billionaires buying IOSP?
Built from public SEC filings and public economic data. Not a recommendation.
Why? — Evidence & Confidence ▾
Of 2 tracked investors who changed their IOSP position last quarter, 0 bought and 2 sold (0% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 56/100 in a Overheat regime).
- +2 tracked investors reported holding IOSP at their latest filing
- +Macro Health is 56/100 in a Overheat regime — historically acceptable for this sectorsource
- −2 tracked investors reduced or exited last quarter (0 reduced, 2 sold out)
- −13F data is disclosed up to 45 days after quarter end — positions may have changed since
- · 13F disclosure lag (up to 45 days)
- · Tracked investors are a sample, not the whole market
- · Sector regime fit is a historical average, not a guarantee
Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 9/18/2026.
About INNOSPEC INC (IOSP)
INNOSPEC INC (IOSP) appears in the most recent 13F filings of 2 tracked institutional investors. The largest disclosed position is held by Izzy Englander (Millennium Management), valued at $41M. Across recent filings, tracked investors recorded 5 new positions, 4 increased, 3 reduced, and 4 exited. All data sourced from SEC 13F filings.
Based on recent institutional activity in IOSP
How many top investors track IOSP
Only 2 tracked investors report this position.
IOSP Ownership Composition
How INNOSPEC INC is held across tracked investor types, based on reported 13F positions.
- Multi-Strategy / Quant100.0%
Tracked investors currently reporting IOSP
3 tracked investors have since exited this position — listed separately below.
- Ken GriffinJun 30, 2026Citadel AdvisorsShares98.5KValue$8M% Portfolio0.00%
- Steve CohenJun 30, 2026Point72 Asset ManagementShares42.6KValue$3.5M% Portfolio0.00%
Previously held IOSP
These investors reported IOSP in an earlier quarter but not in their most recent 13F. Figures below are their last reported position, not a current holding.
| Investor | Firm | Last reported shares | Value then | Last held |
|---|---|---|---|---|
| Izzy Englander | Millennium Management | 61.4K | $4.5M | Mar 31, 2026 |
| Paul Tudor Jones | Tudor Investment Corp | 3.8K | $276.3K | Mar 31, 2026 |
| Ray Dalio | Bridgewater Associates | 6K | $434.5K | Mar 31, 2026 |
Recent activity
- New$434.5KMay 15, 2026
- Sold$0(-100.00%)Aug 14, 2026
- New$214.9KNov 14, 2024
- Increased$266.9K(27.63%)Feb 14, 2025
- Increased$1.5M(543.30%)Jul 21, 2025
- Reduced$929.1K(-29.18%)Aug 14, 2025
- Increased$910K(6.74%)Nov 14, 2025
- Sold$0(-100.00%)Feb 17, 2026
- $2.6MAug 14, 2024
- Reduced$1.7M(-29.67%)Nov 14, 2024
- Sold$0(-100.00%)Feb 14, 2025
- $1.3MMay 15, 2025
- Increased$1.9M(71.03%)Aug 14, 2025
- Reduced$325.2K(-81.49%)Dec 9, 2025
- $276.3KMay 15, 2026
- Sold$0(-100.00%)Aug 14, 2026
Frequently asked questions
- How many institutional investors hold IOSP?
- 2 tracked institutional investors disclosed a position in IOSP (INNOSPEC INC) in their most recent 13F filing.
- Who is the largest institutional holder of IOSP?
- Izzy Englander, Millennium Management, holds the largest disclosed position in IOSP, valued at $41M.
- Did institutional ownership of IOSP increase or decrease?
- Across recent 13F filings, tracked investors recorded 5 new positions, 4 increased, 3 reduced, and 4 fully exited IOSP.
- Where does this IOSP ownership data come from?
- SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.