Innospec Inc.
Innospec Inc. (IOSP) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IOSP · as of Sep 30, 2025
Ownership Breakdown
267
Institutional Holders
▲ 3 vs Q2
$1.85B
Total Inst. Value
▼ $183.88M vs Q2
24.63M
Shares Outstanding
freeFloat 98.73%
23.96M
13F Shares Held
▼ 104,494 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IOSP largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. chemicals & allied products | 3.63M | 14.56% | 14.56% | $280.32B | Nov 12, 2025 | ▼ 29.4K |
VANGUARD GROUP INC chemicals & allied products | 3.14M | 12.60% | 12.60% | $242.55B | Nov 7, 2025 | ▼ 19.5K |
ALLSPRING GLOBAL INVESTMENTS HOLDINGS, LLC chemicals & allied products | 2.39M | 9.58% | 9.58% | $183.76B | Oct 20, 2025 | ▼ 91.4K |
DIMENSIONAL FUND ADVISORS LP chemicals & allied products | 1.17M | 4.68% | 4.68% | $90.04B | Nov 12, 2025 | ▼ 1.9K |
STATE STREET CORP chemicals & allied products | 929.1K | 3.72% | 3.72% | $71.69B | Nov 14, 2025 | ▼ 41.1K |
VICTORY CAPITAL MANAGEMENT INC chemicals & allied products | 835.9K | 3.35% | 3.35% | $64.50B | Nov 12, 2025 | ▼ 122.6K |
FIRST TRUST ADVISORS LP chemicals & allied products | 640.6K | 2.57% | 2.57% | $49.43B | Nov 12, 2025 | ▼ 161.9K |
GEODE CAPITAL MANAGEMENT, LLC chemicals & allied products | 614.2K | 2.46% | 2.46% | $47.40B | Nov 12, 2025 | ▼ 105.4K |
ROYCE & ASSOCIATES LP chemicals & allied products | 492.6K | 1.97% | 1.97% | $38.01B | Nov 12, 2025 | ▼ 134.9K |
MILLENNIUM MANAGEMENT LLC chemicals & allied products | 481.5K | 1.93% | 1.93% | $37.15B | Nov 14, 2025 | ▲ 131.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
23
Increased
+1.41M shares2
New Positions
first time holders25
Decreased
−1.17M shares0
Sold Out
fully exitedNet shares change (top 50)
+239.9K
+1.41M / −1.17M
Net new holders
+0
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IOSP insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
20
Buy transactions
14
Sell transactions
1.43
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Blackmore Milton C director | Feb 27, 2026 | Sale | 287 | $76.30 | $21.9K | 10.8K | Form 4 ↗ |
Blackmore Milton C director | Feb 27, 2026 | Sale | 307 | $76.79 | $23.6K | 10.5K | Form 4 ↗ |
PADFIELD Larry director | Feb 27, 2026 | Sale | 287 | $76.30 | $21.9K | 9.8K | Form 4 ↗ |
PADFIELD Larry director | Feb 27, 2026 | Sale | 307 | $76.79 | $23.6K | 9.5K | Form 4 ↗ |
Poccia Claudia director | Feb 27, 2026 | Sale | 57 | $76.30 | $4.3K | 6.6K | Form 4 ↗ |
Poccia Claudia director | Feb 27, 2026 | Sale | 62 | $76.79 | $4.8K | 6.5K | Form 4 ↗ |
LANDLESS DAVID director | Feb 27, 2026 | Sale | 287 | $76.30 | $21.9K | 7.9K | Form 4 ↗ |
LANDLESS DAVID director | Feb 27, 2026 | Sale | 307 | $76.79 | $23.6K | 7.6K | Form 4 ↗ |
Cleminson Ian EVP & CFO | Feb 27, 2026 | Sale | 1,149 | $76.30 | $87.7K | 21.6K | Form 4 ↗ |
Cleminson Ian EVP & CFO | Feb 27, 2026 | Sale | 1,231 | $76.79 | $94.5K | 20.4K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Innospec Inc. (IOSP) is primarily owned by institutional investors, who hold approximately 97.3% of total shares outstanding. Company insiders own approximately 1.27%, while retail and public investors account for the remaining 1.44%.
The largest institutional shareholder of Innospec Inc. is BLACKROCK, INC., holding approximately 3.63 million shares — equal to 14.56% of outstanding shares — as of September 30, 2025.
A total of 267 institutional investors currently hold IOSP stock, with a combined institutional value of approximately $1.85 billion as of the most recent 13F filing period.
Frequently asked questions
IOSP ownershipInnospec Inc. (IOSP) is primarily owned by institutional investors, who hold approximately 97.3% of shares. The largest shareholder is BLACKROCK, INC. with a 14.56% stake. Company insiders hold 1.27%. Data sourced from SEC Form 13F as of September 30, 2025.