INNOSPEC INC (IOSP) Top Institutional Shareholders
INNOSPEC INC (IOSP) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $1.76B in IOSP holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of IOSP tracked by InsiderSet, reporting ownership valued at approximately $283.24M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $322.38M, representing an estimated gain of +13.82% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 59% of the total disclosed IOSP value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Allspring Global Investments Holdings, Llc, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in INNOSPEC INC (IOSP).
This page ranks the largest institutional IOSP shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
262
Total Reported Value
$1.76B
Largest Holder
Blackrock, Inc.
Largest Position
$283.24M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
109
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 3,878,975 | $283,242,788 | $322,381,612 | +$39,138,824 | +13.82% | |
| Allspring Global Investments Holdings, Llc | 0.29% | 2,315,942 | $170,453,331 | $192,477,940 | +$22,024,609 | +12.92% | |
| Vanguard Portfolio Management Llc | 0.01% | 1,860,091 | $135,823,845 | $154,592,163 | +$18,768,318 | +13.82% | |
| Dimensional Fund Advisors Lp | 0.02% | 1,242,089 | $90,698,470 | $103,230,017 | +$12,531,547 | +13.82% | |
| Vanguard Capital Management Llc | 0.00% | 1,114,598 | $81,387,946 | $92,634,240 | +$11,246,294 | +13.82% | |
| State Street Corp | 0.00% | 964,335 | $70,415,742 | $80,145,882 | +$9,730,140 | +13.82% | |
| Victory Capital Management Inc | 0.04% | 864,994 | $63,161,862 | $71,889,651 | +$8,727,789 | +13.82% | |
| Nuveen, Llc | 0.01% | 643,248 | $46,969,968 | $53,460,341 | +$6,490,373 | +13.82% | |
| Geode Capital Management, Llc | 0.00% | 630,592 | $46,054,326 | $52,408,501 | +$6,354,175 | +13.80% | |
| Two Sigma Investments, Lp | 0.04% | 593,039 | $43,303,708 | $49,287,471 | +$5,983,763 | +13.82% | |
| Ubs Group Ag | 0.01% | 565,911 | $41,322,822 | $47,032,863 | +$5,710,041 | +13.82% | |
| Goldman Sachs Group Inc | 0.00% | 492,011 | $35,926,615 | $40,891,034 | +$4,964,419 | +13.82% | |
| Assenagon Asset Management S.A. | 0.06% | 490,884 | $35,844,350 | $40,797,369 | +$4,953,019 | +13.82% | |
| Qube Research & Technologies Ltd | 0.04% | 406,624 | $29,691,684 | $33,794,521 | +$4,102,837 | +13.82% | |
| Charles Schwab Investment Management Inc | 0.00% | 365,874 | $26,716,119 | $30,407,788 | +$3,691,669 | +13.82% | |
| Aqr Capital Management Llc | 0.01% | 312,065 | $22,787,019 | $25,935,722 | +$3,148,703 | +13.82% | |
| Brown Advisory Inc | 0.04% | 296,465 | $21,647,924 | $24,639,206 | +$2,991,282 | +13.82% | |
| Gendell Jeffrey L | 0.29% | 294,504 | $21,504,682 | $24,476,227 | +$2,971,545 | +13.82% | |
| Bank Of America Corp | 0.00% | 290,766 | $21,231,733 | $24,165,562 | +$2,933,829 | +13.82% | |
| D. E. Shaw & Co., Inc. | 0.02% | 286,794 | $20,941,698 | $23,835,449 | +$2,893,751 | +13.82% | |
| Northern Trust Corp | 0.00% | 284,239 | $20,755,133 | $23,623,103 | +$2,867,970 | +13.82% | |
| Royce & Associates Lp | 0.19% | 261,336 | $19,082,755 | $21,719,635 | +$2,636,880 | +13.82% | |
| Morgan Stanley | 0.00% | 235,571 | $17,201,436 | $19,578,306 | +$2,376,870 | +13.82% | |
| Western Standard Llc | 8.71% | 226,833 | $16,563,346 | $18,852,091 | +$2,288,745 | +13.82% | |
| Citadel Advisors Llc | 0.01% | 220,883 | $16,128,877 | $18,357,586 | +$2,228,709 | +13.82% | |
| Sei Investments Co | 0.01% | 174,121 | $12,714,498 | $14,471,196 | +$1,756,698 | +13.82% | |
| Point72 Asset Management, L.P. | 0.02% | 166,794 | $12,179,298 | $13,862,249 | +$1,682,951 | +13.82% | |
| Vanguard Fiduciary Trust Co | 0.00% | 160,752 | $11,738,111 | $13,360,099 | +$1,621,988 | +13.82% | |
| First Wilshire Securities Management Inc | 2.44% | 148,072 | $10,812,217 | $12,306,264 | +$1,494,047 | +13.82% | |
| Janus Henderson Group Plc | 0.00% | 133,272 | $9,732,040 | $11,076,236 | +$1,344,196 | +13.81% | |
| Bank Of New York Mellon Corp | 0.00% | 131,291 | $9,586,837 | $10,911,595 | +$1,324,758 | +13.82% | |
| Hotchkis & Wiley Capital Management Llc | 0.03% | 120,810 | $8,821,546 | $10,040,519 | +$1,218,973 | +13.82% | |
| Principal Financial Group Inc | 0.00% | 120,477 | $8,797,230 | $10,012,843 | +$1,215,613 | +13.82% | |
| Panagora Asset Management Inc | 0.03% | 119,675 | $8,738,669 | $9,946,189 | +$1,207,520 | +13.82% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 118,900 | $8,682,078 | $9,881,779 | +$1,199,701 | +13.82% |
| Invesco Ltd. | 0.00% | 118,084 | $8,622,493 | $9,813,961 | +$1,191,468 | +13.82% | |
| Voloridge Investment Management, Llc | 0.03% | 107,963 | $7,883,458 | $8,972,805 | +$1,089,347 | +13.82% | |
| Zwj Investment Counsel Inc | 0.27% | 103,787 | $7,578,864 | $8,625,738 | +$1,046,874 | +13.81% | |
| Teacher Retirement System Of Texas | 0.03% | 103,102 | $7,528,509 | $8,568,807 | +$1,040,298 | +13.82% | |
| Jane Street Group, Llc | 0.01% | 94,506 | $6,900,829 | $7,854,394 | +$953,565 | +13.82% | |
| Proshare Advisors Llc | 0.01% | 89,841 | $6,560,190 | $7,466,686 | +$906,496 | +13.82% | |
| Public Sector Pension Investment Board | 0.02% | 88,694 | $6,476,436 | $7,371,358 | +$894,922 | +13.82% | |
| Mutual Of America Capital Management Llc | 0.07% | 87,463 | $6,386,548 | $7,269,050 | +$882,502 | +13.82% | |
| Trexquant Investment Lp | 0.04% | 78,370 | $5,722,577 | $6,513,331 | +$790,754 | +13.82% | |
| Numerai Gp Llc | 0.56% | 76,616 | $5,594,500 | $6,367,556 | +$773,056 | +13.82% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 74,443 | $5,435,828 | $6,186,958 | +$751,130 | +13.82% | |
| Russell Investments Group, Ltd. | 0.01% | 71,607 | $5,228,892 | $5,951,258 | +$722,366 | +13.81% | |
| Rhumbline Advisers | 0.00% | 71,157 | $5,195,862 | $5,913,858 | +$717,996 | +13.82% | |
| Leeward Investments, Llc - Ma | 0.25% | 69,810 | $5,097,526 | $5,801,909 | +$704,383 | +13.82% | |
| Deprince Race & Zollo Inc | 0.09% | 68,029 | $4,967,477 | $5,653,890 | +$686,413 | +13.82% |
Frequently asked questions about IOSP
Who owns the most IOSP stock?
The largest holders of IOSP are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for INNOSPEC INC (IOSP).
Is IOSP widely held by superinvestors?
Many widely followed stocks like IOSP appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly IOSP is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.