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

Save this security page for your next review

Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.

Create free account and return here Sign in and return here Review latest holder period
Type / Class
Equity / Common Stock
Symbol
IOSP on Nasdaq
Shares outstanding
24,907,931
Price per share
$72.24
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
$72.24
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.
  • 4 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 258 to 111 between Q4 2025 and Q1 2026.
  • Reported value moved from $1,859,374,510 to $749,146,147.

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
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 Dec 2025, 258 institutional investors reported holding 24,299,165 shares of INNOSPEC INC. - Common Stock (IOSP). This represents 98% of the company’s total 24,907,931 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 13% 3,121,151 -0.71% 0% $238,892,898
Allspring Global Investments Holdings, LLC 9.5% 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 0.98% 243,535 -4% 0% $18,640,214
Assenagon Asset Management S.A. 0.72% 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 10,240,899 $749,146,147 +$76,280,769 $73.02 111
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
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Here you can make detailed settings or revoke your consent (in part if necessary) with effect for the future. For further information, please refer to our Privacy Policy .