Latest Period
Q1 2026
Security Snapshot
INNOSPEC INC. - Common Stock (IOSP) Institutional Ownership
CUSIP: 45768S105
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
265
Shares (Excl. Options)
24,940,974
Price
$73.02
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- Security type / class
- Equity / Common Stock
- Symbol
- IOSP on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 24,940,974
- Total 13F value
- $1,822,750,445
- Portfolio coverage rank
- 0%
- Share change
- +587,460
- Value change
- +$37,639,681
- Number of holders
- 265
- Shares outstanding
- 24,907,931
- SEC-reported price per share
- $80.82
- Insider filing price
- $80.82
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 is tracked under CUSIP 45768S105.
- 265 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 259 to 265 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $1,859,411,020 to $1,822,750,445.
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 265 institutions filings for Q1 2026.
Security key
45768S105
Latest holder period
Q1 2026
13F holders
265
13D/G owners
4
CIK / CUSIP context first
Open Q1 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
4
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 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.5% | $136,565,947 | 1,870,254 | Vanguard Portfolio Management | 31 Mar 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 31 Mar 2026, 265 institutional investors reported holding 24,940,974 shares of INNOSPEC INC. - Common Stock (IOSP). This represents 100% of the company’s total 24,907,931 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. | 16% | 3,878,975 | +5.9% | 0% | $283,242,788 |
| Allspring Global Investments Holdings, LLC | 9.3% | 2,315,942 | -1.7% | 0.29% | $170,453,331 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.5% | 1,860,091 | 0% | 0.01% | $135,823,845 |
| DIMENSIONAL FUND ADVISORS LP | 5% | 1,242,089 | +5.7% | 0.02% | $90,698,470 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.5% | 1,114,598 | 0% | 0% | $81,387,946 |
| STATE STREET CORP | 3.9% | 964,335 | +1.6% | 0% | $70,415,742 |
| VICTORY CAPITAL MANAGEMENT INC | 3.5% | 864,994 | -9% | 0.04% | $63,161,862 |
| Nuveen, LLC | 2.6% | 643,248 | +28% | 0.01% | $46,969,968 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.5% | 630,592 | +3.5% | 0% | $46,054,326 |
| TWO SIGMA INVESTMENTS, LP | 2.4% | 593,039 | +272% | 0.04% | $43,303,708 |
| UBS Group AG | 2.3% | 565,911 | +298% | 0.01% | $41,322,822 |
| GOLDMAN SACHS GROUP INC | 2% | 492,011 | +1.5% | 0% | $35,926,615 |
| Assenagon Asset Management S.A. | 2% | 490,884 | +175% | 0.06% | $35,844,350 |
| JPMORGAN CHASE & CO | 1.7% | 426,050 | +39% | 0% | $31,182,599 |
| Qube Research & Technologies Ltd | 1.6% | 406,624 | +27% | 0.04% | $29,691,684 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.5% | 365,874 | -2.1% | 0% | $26,716,119 |
| AQR CAPITAL MANAGEMENT LLC | 1.3% | 312,065 | +16% | 0.01% | $22,787,019 |
| BROWN ADVISORY INC | 1.2% | 296,465 | -3.1% | 0.04% | $21,647,924 |
| GENDELL JEFFREY L | 1.2% | 294,504 | +3.2% | 0.29% | $21,504,682 |
| BANK OF AMERICA CORP /DE/ | 1.2% | 290,766 | -9.8% | 0% | $21,231,733 |
| D. E. Shaw & Co., Inc. | 1.2% | 286,794 | -7.5% | 0.02% | $20,941,698 |
| NORTHERN TRUST CORP | 1.1% | 284,239 | +3.5% | 0% | $20,755,133 |
| ROYCE & ASSOCIATES LP | 1% | 261,336 | -14% | 0.19% | $19,082,755 |
| MORGAN STANLEY | 0.95% | 235,571 | -3.3% | 0% | $17,201,436 |
| Western Standard LLC | 0.91% | 226,833 | -15% | 8.7% | $16,563,346 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 24,940,974 | $1,822,750,445 | +$37,639,681 | $73.02 | 265 |
| 2025 Q4 | 24,299,642 | $1,859,411,020 | +$40,227,383 | $76.54 | 259 |
| 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 |
| 2020 Q1 | 23,258,390 | $1,616,072,269 | -$17,899,736 | $69.49 | 173 |