INNOSPEC INC. - Common Stock (IOSP) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2014 to Q4 2025

Type / Class
Equity / Common Stock
Symbol
IOSP on Nasdaq
Shares outstanding
25,045,347
Price per share
$76.54
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
23,963,376
Total reported value
$1,848,287,284
% of total 13F portfolios
0%
Share change
-136,931
Value change
-$14,200,267
Number of holders
264
Price from insider filings
$76.54
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of INNOSPEC INC. - Common Stock (IOSP) based on Schedule 13D/G filings

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
WASATCH ADVISORS LP 2.1% -70% $47,480,146 -$94,572,193 528,144 -67% WASATCH ADVISORS LP 31 Mar 2025

As of 30 Sep 2025, 264 institutional investors reported holding 23,963,376 shares of INNOSPEC INC. - Common Stock (IOSP). This represents 96% of the company’s total 25,045,347 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of INNOSPEC INC. - Common Stock (IOSP) together control 76% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
BlackRock, Inc. 15% 3,632,985 -0.8% 0% $280,321,148
VANGUARD GROUP INC 13% 3,143,422 -0.62% 0% $242,546,441
Allspring Global Investments Holdings, LLC 9.5% 2,391,749 -3.7% 0.29% $183,758,076
DIMENSIONAL FUND ADVISORS LP 4.7% 1,166,975 -0.17% 0.02% $90,043,413
STATE STREET CORP 3.7% 929,123 -4.2% 0% $71,691,131
VICTORY CAPITAL MANAGEMENT INC 3.3% 835,895 -13% 0.04% $64,497,658
FIRST TRUST ADVISORS LP 2.6% 640,562 -20% 0.04% $49,425,758
GEODE CAPITAL MANAGEMENT, LLC 2.5% 614,212 -15% 0% $47,399,408
ROYCE & ASSOCIATES LP 2% 492,614 -21% 0.38% $38,010,096
MILLENNIUM MANAGEMENT LLC 1.9% 481,488 +38% 0.03% $37,151,614
WESTWOOD HOLDINGS GROUP INC 1.8% 447,962 +8.6% 0.25% $34,565,000
Nuveen, LLC 1.6% 411,277 +39% 0.01% $31,734,133
BANK OF AMERICA CORP /DE/ 1.5% 375,331 +27% 0% $28,960,539
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 1.4% 360,590 +1.2% 0% $27,823,124
Qube Research & Technologies Ltd 1.4% 354,012 +15% 0.04% $27,315,566
BROWN ADVISORY INC 1.4% 349,972 -18% 0.04% $27,003,850
JPMORGAN CHASE & CO 1.3% 320,982 -0.06% 0% $24,766,972
NORTHERN TRUST CORP 1.2% 299,050 -1.1% 0% $23,074,697
GOLDMAN SACHS GROUP INC 1.1% 282,643 +170% 0% $21,808,722
D. E. Shaw & Co., Inc. 1.1% 273,905 +59% 0.02% $21,134,510
JANUS HENDERSON GROUP PLC 1% 258,107 +1.1% 0.01% $19,915,276
MORGAN STANLEY 1% 253,753 -3.8% 0% $19,579,604
Medina Value Partners, LLC 0.94% 235,956 4.3% $18,206,365
Bank of New York Mellon Corp 0.86% 215,184 -6.8% 0% $16,603,598
AQR CAPITAL MANAGEMENT LLC 0.72% 181,209 +152% 0.01% $13,982,086

Institutional Holders of INNOSPEC INC. - Common Stock (IOSP) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 2,676,683 $204,298,549 +$5,382,301 $76.54 23
2025 Q3 23,963,376 $1,848,287,284 -$14,200,267 $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
2019 Q4 23,277,011 $2,407,427,151 +$21,726,636 $103.44 204
2019 Q3 23,066,976 $2,056,091,769 -$7,366,544 $89.14 206
2019 Q2 23,141,241 $2,111,250,963 +$21,651,212 $91.24 195
2019 Q1 23,211,950 $1,934,749,215 +$18,724,236 $83.35 180
2018 Q4 23,009,258 $1,421,053,426 -$15,887,495 $61.76 174
2018 Q3 23,200,356 $1,778,634,318 +$12,297,417 $76.75 181
2018 Q2 23,054,678 $1,765,007,401 +$25,192,142 $76.55 179
2018 Q1 22,767,515 $1,562,243,507 +$16,085,947 $68.60 173
2017 Q4 22,511,049 $1,589,317,021 +$23,824,591 $70.60 179
2017 Q3 22,179,681 $1,367,519,477 -$3,085,905 $61.65 175
2017 Q2 22,214,871 $1,456,135,048 +$19,485,581 $65.55 169
2017 Q1 22,160,057 $1,434,900,430 +$174,009,041 $64.75 181
2016 Q4 22,204,256 $1,520,866,778 +$53,035,862 $68.50 196
2016 Q3 21,459,774 $1,303,899,942 +$4,539,733 $60.81 202
2016 Q2 21,421,864 $985,184,393 -$18,652,339 $45.99 179
2016 Q1 21,858,998 $948,022,074 -$18,351,463 $43.36 186
2015 Q4 21,984,374 $1,193,887,849 -$36,829,060 $54.31 191
2015 Q3 22,776,298 $1,059,335,663 +$29,985,624 $46.51 164
2015 Q2 22,179,299 $998,958,519 -$6,083,764 $45.04 146
2015 Q1 22,308,178 $1,034,500,250 -$527,304 $46.39 135
2014 Q4 22,352,587 $954,384,594 -$27,139,442 $42.70 121
2014 Q3 22,989,510 $825,321,952 +$16,506,021 $35.90 103
2014 Q2 22,500,581 $971,126,734 +$4,163,277 $43.17 105
2014 Q1 22,396,163 $1,012,832,775 +$8,123,937 $45.23 105