Security Snapshot

INNOSPEC INC. - Common Stock (IOSP) Institutional Ownership

CUSIP: 45768S105

13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026

Latest Period

Q4 2025

Institutions Reporting

258

Shares (Excl. Options)

24,299,165

Price

$76.54

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Type / Class
Equity / Common Stock
Symbol
IOSP on Nasdaq
Shares outstanding
25,045,347
Price per share
$73.02
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
24,299,165
Total reported value
$1,859,374,510
% of total 13F portfolios
0%
Share change
+527,964
Value change
+$40,259,836
Number of holders
258
Price from insider filings
$73.02
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Quick Takeaways

  • IOSP - INNOSPEC INC. - Common Stock is tracked under CUSIP 45768S105.
  • 258 institutions reported positions in Q4 2025.
  • 2 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 258 to 17 between Q4 2025 and Q1 2026.
  • Reported value moved from $1,859,374,510 to $8,067,304.

Why This Matters

  • 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.

Source Evidence

Source: SEC Form 13F

Latest holder context comes from 258 institutions filings for Q4 2025.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 45768S105?
CUSIP 45768S105 identifies IOSP - INNOSPEC INC. - Common Stock in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.

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 31 Dec 2025, 258 institutional investors reported holding 24,299,165 shares of INNOSPEC INC. - Common Stock (IOSP). This represents 97% 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% 3,662,323 +0.81% 0% $280,314,199
VANGUARD GROUP INC 12% 3,121,151 -0.71% 0% $238,892,898
Allspring Global Investments Holdings, LLC 9.4% 2,356,503 -1.5% 0.29% $179,754,049
DIMENSIONAL FUND ADVISORS LP 4.7% 1,175,122 +0.7% 0.02% $89,946,408
VICTORY CAPITAL MANAGEMENT INC 3.8% 950,074 +14% 0.04% $72,718,664
STATE STREET CORP 3.8% 949,038 +2.1% 0% $72,639,369
GEODE CAPITAL MANAGEMENT, LLC 2.4% 609,220 -0.81% 0% $46,637,981
MILLENNIUM MANAGEMENT LLC 2.1% 533,312 +11% 0.03% $40,819,700
Nuveen, LLC 2% 502,603 +22% 0.01% $38,469,234
WESTWOOD HOLDINGS GROUP INC 2% 491,451 +9.7% 0.31% $37,615,660
GOLDMAN SACHS GROUP INC 1.9% 484,968 +72% 0.01% $37,119,453
Medina Value Partners, LLC 1.5% 378,769 +61% 6.8% $28,990,979
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 1.5% 373,540 +3.6% 0% $28,590,752
BANK OF AMERICA CORP /DE/ 1.3% 322,358 -14% 0% $24,673,283
Qube Research & Technologies Ltd 1.3% 320,504 -9.5% 0.04% $24,531,376
D. E. Shaw & Co., Inc. 1.2% 309,927 +13% 0.02% $23,721,812
BROWN ADVISORY INC 1.2% 305,977 -13% 0.03% $23,419,533
JPMORGAN CHASE & CO 1.2% 305,875 -4.7% 0% $23,411,673
ROYCE & ASSOCIATES LP 1.2% 305,226 -38% 0.24% $23,361,998
GENDELL JEFFREY L 1.1% 285,351 +63% 0.38% $21,840,766
NORTHERN TRUST CORP 1.1% 274,689 -8.1% 0% $21,024,696
Western Standard LLC 1.1% 268,367 +894% 9.5% $20,540,810
AQR CAPITAL MANAGEMENT LLC 1.1% 268,151 +48% 0.01% $20,524,308
MORGAN STANLEY 0.97% 243,535 -4% 0% $18,640,214
Assenagon Asset Management S.A. 0.71% 178,204 +38% 0.02% $13,639,734

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

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q1 110,390 $8,067,304 -$912,501 $73.02 17
2025 Q4 24,299,165 $1,859,374,510 +$40,259,836 $76.54 258
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
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