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 Mar 31, 2025
Ownership Breakdown
278
Institutional Holders
▲ 13 vs Q4
$2.30B
Total Inst. Value
▼ $363.87M vs Q4
24.63M
Shares Outstanding
freeFloat 98.73%
24.53M
13F Shares Held
▲ 297,703 vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. chemicals & allied products | 3.75M | 15.01% | 15.01% | $355.10B | May 2, 2025 | ▼ 160.2K |
VANGUARD GROUP INC chemicals & allied products | 3.21M | 12.86% | 12.86% | $304.22B | May 9, 2025 | ▲ 30.0K |
ALLSPRING GLOBAL INVESTMENTS HOLDINGS, LLC chemicals & allied products | 2.40M | 9.63% | 9.63% | $227.35B | Apr 24, 2025 | ▲ 19.0K |
DIMENSIONAL FUND ADVISORS LP chemicals & allied products | 1.16M | 4.64% | 4.64% | $109.72B | May 13, 2025 | ▼ 566 |
VICTORY CAPITAL MANAGEMENT INC chemicals & allied products | 1.11M | 4.43% | 4.43% | $104.84B | May 2, 2025 | ▲ 184.3K |
STATE STREET CORP chemicals & allied products | 1.01M | 4.05% | 4.05% | $95.83B | May 15, 2025 | ▼ 24.1K |
FIRST TRUST ADVISORS LP chemicals & allied products | 892.2K | 3.57% | 3.57% | $84.53B | May 14, 2025 | ▲ 462.2K |
GEODE CAPITAL MANAGEMENT, LLC chemicals & allied products | 705.1K | 2.82% | 2.82% | $66.82B | May 13, 2025 | ▲ 13.1K |
ROYCE & ASSOCIATES LP chemicals & allied products | 653.6K | 2.62% | 2.62% | $61.93B | May 6, 2025 | ▼ 124.1K |
WASATCH ADVISORS LP chemicals & allied products | 528.1K | 2.12% | 2.12% | $50.04B | May 15, 2025 | ▼ 1.05M |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
30
Increased
+1.94M shares3
New Positions
first time holders17
Decreased
−1.66M shares0
Sold Out
fully exitedNet shares change (top 50)
+284.5K
+1.94M / −1.66M
Net new holders
+16
3 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 99.6% of total shares outstanding. Company insiders own approximately 1.27%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Innospec Inc. is BLACKROCK, INC., holding approximately 3.75 million shares — equal to 15.01% of outstanding shares — as of March 31, 2025.
A total of 278 institutional investors currently hold IOSP stock, with a combined institutional value of approximately $2.30 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 99.6% of shares. The largest shareholder is BLACKROCK, INC. with a 15.01% stake. Company insiders hold 1.27%. Data sourced from SEC Form 13F as of March 31, 2025.