Latest Period
Q2 2026
Security Snapshot
INNOSPEC INC. - Common Stock SH (IOSP) Institutional Ownership
CUSIP: 45768S105
13F Institutional Holders and Ownership History from Q1 2014 to Q2 2026
Institutions Reporting
277
Shares (Excl. Options)
24,564,652
Price
$81.39
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- Security type / class
- Equity / Common Stock SH
- Symbol
- IOSP on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 24,564,652
- Total 13F value
- $1,999,627,095
- Portfolio coverage rank
- 0%
- Share change
- -314,755
- Value change
- -$22,881,268
- Number of holders
- 277
- Shares outstanding
- 24,577,545
- SEC-reported price per share
- $84.25
- Insider filing price
- $84.25
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- IOSP - INNOSPEC INC. - Common Stock SH is tracked under CUSIP 45768S105.
- 277 institutions reported positions in Q2 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 266 to 277 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $1,822,757,090 to $1,999,627,095.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 277 institutions filings for Q2 2026.
Security key
45768S105
Latest holder period
Q2 2026
13F holders
277
13D/G owners
6
CIK / CUSIP context first
Open Q2 2026 holders
IOSP full holder history
INNOSPEC INC. SEC filings
INNOSPEC INC. company facts
INNOSPEC INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 45768S105:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
IOSP
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 15% | $330,981,773 | 3,681,666 | BlackRock, Inc. | 31 Mar 2025 | |||
| Allspring Global Investments Holdings, LLC | 7.7% | $152,760,259 | 1,892,471 | Allspring Global Investments Holdings, LLC | 30 Jun 2026 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.5% | $136,565,947 | 1,870,254 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| DIMENSIONAL FUND ADVISORS LP | 5.3% | $106,217,043 | 1,305,038 | Dimensional Fund Advisors LP | 30 Jun 2026 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2% | $94,940,166 | 1,300,194 | Vanguard Capital Management | 31 Mar 2026 | |||
| WASATCH ADVISORS LP | 2.1% | -70% | $47,480,146 | -$94,572,193 | 528,144 | -67% | WASATCH ADVISORS LP | 31 Mar 2025 |
As of 30 Jun 2026, 277 institutional investors reported holding 24,564,652 shares of INNOSPEC INC. - Common Stock SH (IOSP). This represents 100% of the company’s total 24,577,545 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
78%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 18% | 4,381,323 | +13% | 0.01% | $356,595,899 |
| Allspring Global Investments Holdings, LLC | 7.7% | 1,892,471 | -18% | 0.24% | $154,747,354 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.7% | 1,884,244 | +1.3% | 0.01% | $153,358,619 |
| DIMENSIONAL FUND ADVISORS LP | 5.3% | 1,305,038 | +5.1% | 0.02% | $106,215,943 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.5% | 1,108,107 | -0.58% | 0% | $90,188,829 |
| STATE STREET CORP | 4.1% | 996,027 | +3.3% | 0% | $81,066,638 |
| Nuveen, LLC | 3.1% | 755,723 | +17% | 0.01% | $61,508,264 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.7% | 666,589 | +5.7% | 0% | $54,263,961 |
| GOLDMAN SACHS GROUP INC | 2.7% | 662,210 | +35% | 0.01% | $53,897,272 |
| VICTORY CAPITAL MANAGEMENT INC | 2.7% | 660,110 | -24% | 0.03% | $53,726,353 |
| TWO SIGMA INVESTMENTS, LP | 2.3% | 568,709 | -4.1% | 0.03% | $46,287,226 |
| AQR CAPITAL MANAGEMENT LLC | 2% | 482,545 | +55% | 0.01% | $39,274,305 |
| BROWN ADVISORY INC | 1.7% | 408,468 | +38% | 0.05% | $33,245,234 |
| JPMORGAN CHASE & CO | 1.5% | 370,574 | -13% | 0% | $29,998,212 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.4% | 355,658 | -2.8% | 0% | $28,947,005 |
| GENDELL JEFFREY L | 1.3% | 324,504 | +10% | 0.24% | $26,411,381 |
| ROYCE & ASSOCIATES LP | 1.3% | 308,726 | +18% | 0.2% | $25,127,209 |
| NORTHERN TRUST CORP | 1.2% | 303,044 | +6.6% | 0% | $24,664,751 |
| Qube Research & Technologies Ltd | 1.2% | 285,849 | -30% | 0.03% | $23,265,250 |
| ACADIAN ASSET MANAGEMENT LLC | 1.1% | 273,999 | +124% | 0.03% | $22,287,000 |
| Assenagon Asset Management S.A. | 1.1% | 272,782 | -44% | 0.03% | $22,201,727 |
| Western Standard LLC | 0.96% | 236,833 | +4.4% | 6.5% | $19,275,838 |
| BANK OF AMERICA CORP /DE/ | 0.96% | 235,742 | -19% | 0% | $19,187,042 |
| MORGAN STANLEY | 0.94% | 230,793 | -2% | 0% | $18,784,284 |
| RENAISSANCE TECHNOLOGIES LLC | 0.75% | 185,000 | +56% | 0.02% | $15,057,150 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
50
Latest
Q2 2026
Rows shown
1-25 of 50
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 24,564,652 | $1,999,627,095 | -$22,881,268 | $81.39 | 277 |
| 2026 Q1 | 24,941,065 | $1,822,757,090 | +$37,640,486 | $73.02 | 266 |
| 2025 Q4 | 24,299,685 | $1,859,414,311 | +$40,227,383 | $76.54 | 260 |
| 2025 Q3 | 23,963,379 | $1,848,287,053 | -$12,042,822 | $77.16 | 264 |
| 2025 Q2 | 24,066,037 | $2,032,008,818 | -$244,646 | $84.09 | 262 |
| 2025 Q1 | 23,973,835 | $2,271,712,359 | -$35,858,821 | $94.75 | 270 |
| 2024 Q4 | 24,212,381 | $2,659,279,588 | +$14,644,053 | $110.06 | 261 |
| 2024 Q3 | 24,105,192 | $2,727,117,423 | +$4,417,606 | $113.09 | 259 |
| 2024 Q2 | 23,993,232 | $2,964,962,134 | +$1,498,648 | $123.59 | 265 |
| 2024 Q1 | 23,993,573 | $3,093,142,709 | +$6,811,780 | $128.94 | 236 |
| 2023 Q4 | 23,984,746 | $2,955,807,103 | +$15,777,725 | $123.24 | 223 |
| 2023 Q3 | 23,846,506 | $2,437,092,549 | +$4,040,039 | $102.20 | 212 |
| 2023 Q2 | 23,803,019 | $2,390,832,044 | -$7,222,988 | $100.44 | 203 |
| 2023 Q1 | 23,876,871 | $2,451,393,601 | +$13,429,205 | $102.67 | 218 |
| 2022 Q4 | 23,954,256 | $2,464,210,922 | -$11,084,067 | $102.86 | 221 |
| 2022 Q3 | 24,019,341 | $2,057,996,766 | -$14,313,033 | $85.67 | 185 |
| 2022 Q2 | 23,943,559 | $2,293,579,459 | +$28,390,916 | $95.79 | 194 |
| 2022 Q1 | 23,782,835 | $2,201,834,301 | +$3,239,616 | $92.55 | 179 |
| 2021 Q4 | 23,708,461 | $2,141,965,911 | -$193,662,634 | $90.34 | 180 |
| 2021 Q3 | 23,443,306 | $1,974,530,265 | +$4,266,539 | $84.22 | 181 |
| 2021 Q2 | 23,369,465 | $2,117,538,766 | -$19,832,760 | $90.61 | 174 |
| 2021 Q1 | 23,558,548 | $2,419,455,343 | -$18,274,703 | $102.69 | 175 |
| 2020 Q4 | 23,750,236 | $2,155,050,110 | +$63,786,881 | $90.73 | 171 |
| 2020 Q3 | 23,235,814 | $1,471,592,736 | -$21,476,288 | $63.32 | 181 |
| 2020 Q2 | 23,526,053 | $1,816,779,760 | +$23,545,507 | $77.25 | 178 |