Vault-13

INNOSPEC INC IOSP

COM · Common Stock · CUSIP 45768S105

282 institutional holders +16 vs Q1 2026
24,718,77724.7m shares reported held*
100.4% of all shares outstanding*
$2.0bnreported value*
42 new 104 added 96 reduced 27 sold out net sold ≈ $4.8m (-56.4k shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($12.1m this quarter). Holder counts are more reliable. Shares outstanding: 24.6m as of 2026-07-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $81.40.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0100200300Q3 22: 193Q4 22: 223Q1 23: 220Q2 23: 206Q3 23: 213Q4 23: 224Q1 24: 240Q2 24: 267Q3 24: 262Q4 24: 263Q1 25: 273Q2 25: 263Q3 25: 268Q4 25: 261Q1 26: 266Q2 26: 282282Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 2022193
Q4 2022223
Q1 2023220
Q2 2023206
Q3 2023213
Q4 2023224
Q1 2024240
Q2 2024267
Q3 2024262
Q4 2024263
Q1 2025273
Q2 2025263
Q3 2025268
Q4 2025261
Q1 2026266
Q2 2026282

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
2000200Q3 24: 115 bought or addedQ3 24: 142 cut or sold outQ4 24: 116 bought or addedQ4 24: 122 cut or sold outQ4 24Q1 25: 135 bought or addedQ1 25: 123 cut or sold outQ2 25: 139 bought or addedQ2 25: 125 cut or sold outQ2 25Q3 25: 141 bought or addedQ3 25: 118 cut or sold outQ4 25: 130 bought or addedQ4 25: 122 cut or sold outQ4 25Q1 26: 147 bought or addedQ1 26: 109 cut or sold outQ2 26: 146 bought or addedQ2 26: 123 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 2024115142
Q4 2024116122
Q1 2025135123
Q2 2025139125
Q3 2025141118
Q4 2025130122
Q1 2026147109
Q2 2026146123

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$5m$10m$15mQ3 25 calls: $11.6mQ3 25 puts: $308.6kQ3 25P/C 0.03Q4 25 calls: $11.5mQ4 25 puts: $0Q4 25P/C 0.00Q1 26 calls: $0Q1 26 puts: $0Q1 26P/C —Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$11.6m$308.6k0.03
Q4 2025$11.5m$00.00
Q1 2026$0$0—
Q2 2026$0$0—

Biggest buyers

BlackRock, Inc. Added +502,348+502.3k
AQR CAPITAL MANAGEMENT LLC Added +170,480+170.5k
GOLDMAN SACHS GROUP INC Added +170,199+170.2k
ACADIAN ASSET MANAGEMENT LLC Added +151,447+151.4k
MACKENZIE FINANCIAL CORP New +144,677+144.7k
Nuveen, LLC Added +112,475+112.5k
BROWN ADVISORY INC Added +112,003+112.0k
FIRST TRUST ADVISORS LP Added +78,536+78.5k
SG Capital Management LLC New +71,022+71.0k
Creative Planning Added +66,589+66.6k

Biggest sellers

Allspring Global Investments Holdings, LLC Reduced -423,471-423.5k
UBS Group AG Reduced -411,910-411.9k
VICTORY CAPITAL MANAGEMENT INC Reduced -204,884-204.9k
Point72 Asset Management, L.P. Reduced -124,146-124.1k
CITADEL ADVISORS LLC Reduced -122,334-122.3k
D. E. Shaw & Co., Inc. Reduced -121,048-121.0k
Qube Research & Technologies Ltd Reduced -120,775-120.8k
JANE STREET GROUP, LLC Sold out -94,506-94.5k
VOLORIDGE INVESTMENT MANAGEMENT, LLC Reduced -76,106-76.1k
MILLENNIUM MANAGEMENT LLC Sold out -61,427-61.4k

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
BlackRock, Inc. 13G · institution filed 2025-04-30 14.7% 3.7m≈ $299.7m 2025-04-30
VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 7.5% new 1.9m≈ $152.2m 2026-04-29
DIMENSIONAL FUND ADVISORS LP 13G · institution new · filed 2026-07-14 5.3% new 1.3m≈ $106.2m 2026-07-14
VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 5.2% new 1.3m≈ $105.8m 2026-04-30

Fell to 5% or below in the last year: Allspring Global Investments Holdings, LLC (4.7%, 2026-10-07), VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC)

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
10010Q4 24: 0 buyingQ4 24: 4 sellingQ1 25: 0 buyingQ1 25: 6 sellingQ1 25Q2 25: 0 buyingQ2 25: 1 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 1 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 6 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—4$218.2k—
Q1 20250—6$1.6m—
Q2 20250—1$40.4k—
Q3 20250—0——
Q4 20251$25.2k0——
Q1 20260—6$398.8k—
Q2 20260—0——
Q3 20260—0——

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 BlackRock, Inc. 0.01% of their portfolio New York, NY 4,381,3234.4m $356.6m $356.6m 0.01% Added +502.3k +502,348
2 Allspring Global Investments Holdings, LLC 0.24% of their portfolio CHARLOTTE, NC 1,892,4711.9m $154.7m $154.7m 0.24% Reduced -423.5k -423,471
3 VANGUARD PORTFOLIO MANAGEMENT LLC 0.01% of their portfolio MALVERN, PA 1,884,2441.9m $153.4m $153.4m 0.01% Added +24.2k +24,153
4 DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio AUSTIN, TX 1,305,0381.3m $106.2m $106.2m 0.02% Added +62.9k +62,949
5 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 1,108,1071.1m $90.2m $90.2m 0.00% Reduced -6.5k -6,491
6 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 996,027996.0k $81.1m $81.1m 0.00% Added +31.7k +31,692
7 Nuveen, LLC 0.01% of their portfolio CHARLOTTE, NC 755,723755.7k $61.5m $61.5m 0.01% Added +112.5k +112,475
8 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 666,589666.6k $54.3m $54.3m 0.00% Added +36.0k +35,997
9 GOLDMAN SACHS GROUP INC 0.01% of their portfolio NEW YORK, NY 662,210662.2k $53.9m $53.9m 0.01% Added +170.2k +170,199
10 VICTORY CAPITAL MANAGEMENT INC 0.03% of their portfolio San Antonio, TX 660,110660.1k $53.7m $53.7m 0.03% Reduced -204.9k -204,884
11 TWO SIGMA INVESTMENTS, LP 0.03% of their portfolio NEW YORK, NY 568,709568.7k $46.3m $46.3m 0.03% Reduced -24.3k -24,330
12 Assenagon Asset Management S.A. 0.03% of their portfolio SENNINGERBERG, N4 545,564545.6k $44.4m $44.4m 0.03% Added +54.7k +54,680
13 AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio Greenwich, CT 482,545482.5k $39.3m $39.3m 0.01% Added +170.5k +170,480
14 BROWN ADVISORY INC 0.05% of their portfolio BALTIMORE, MD 408,468408.5k $33.2m $33.2m 0.05% Added +112.0k +112,003
15 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 370,574370.6k $30.0m $30.0m 0.00% Reduced -55.5k -55,476
16 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 355,658355.7k $28.9m $28.9m 0.00% Reduced -10.2k -10,216
17 GENDELL JEFFREY L 0.24% of their portfolio Greenwich, CT 324,504324.5k $26.4m $26.4m 0.24% Added +30.0k +30,000
18 ROYCE & ASSOCIATES LP 0.20% of their portfolio New York, NY 308,726308.7k $25.1m $25.1m 0.20% Added +47.4k +47,390
19 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 303,044303.0k $24.7m $24.7m 0.00% Added +18.8k +18,805
20 Qube Research & Technologies Ltd 0.03% of their portfolio LONDON, X0 285,849285.8k $23.3m $23.3m 0.03% Reduced -120.8k -120,775
21 ACADIAN ASSET MANAGEMENT LLC 0.03% of their portfolio Boston, MA 273,999274.0k $22.3m $22.3m 0.03% Added +151.4k +151,447
22 Western Standard LLC 6.53% of their portfolio Los Angeles, CA 236,833236.8k $19.3m $19.3m 6.53% Added +10.0k +10,000
23 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 235,742235.7k $19.2m $19.2m 0.00% Reduced -55.0k -55,024
24 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 230,793230.8k $18.8m $18.8m 0.00% Reduced -4.8k -4,778
25 RENAISSANCE TECHNOLOGIES LLC 0.02% of their portfolio NEW YORK, NY 185,000185.0k $15.1m $15.1m 0.02% Added +66.1k +66,100
26 PANAGORA ASSET MANAGEMENT INC 0.05% of their portfolio BOSTON, MA 182,538182.5k $14.9m $14.9m 0.05% Added +62.9k +62,863
27 D. E. Shaw & Co., Inc. 0.01% of their portfolio New York, NY 165,746165.7k $13.5m $13.5m 0.01% Reduced -121.0k -121,048
28 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 163,715163.7k $13.3m $13.3m 0.00% Added +3.0k +2,963
29 SEI INVESTMENTS CO 0.01% of their portfolio OAKS, PA 156,051156.1k $12.7m $12.7m 0.01% Reduced -18.1k -18,070
30 UBS Group AG 0.00% of their portfolio ZURICH, V8 154,001154.0k $12.5m $12.5m 0.00% Reduced -411.9k -411,910
31 FIRST WILSHIRE SECURITIES MANAGEMENT INC 2.47% of their portfolio PASADENA, CA 147,112147.1k $12.0m $12.0m 2.47% Reduced -960 -960
32 MACKENZIE FINANCIAL CORP 0.01% of their portfolio TORONTO ONTARIO, A6 144,677144.7k $11.8m $11.8m 0.01% New
33 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 137,261137.3k $11.2m $11.2m 0.00% Added +6.0k +5,970
34 HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC 0.03% of their portfolio Los Angeles, CA 135,740135.7k $11.0m $11.0m 0.03% Added +14.9k +14,930
35 Jupiter Topco LLC 0.00% of their portfolio NEW YORK, NY 127,976128.0k $10.4m $10.4m 0.00% First filing
36 Leeward Investments, LLC - MA 0.46% of their portfolio BOSTON, MA 125,308125.3k $10.2m $10.2m 0.46% Added +55.5k +55,498
37 PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio DES MOINES, IA 119,053119.1k $9.7m $9.7m 0.00% Reduced -1.4k -1,424
38 Russell Investments Group, Ltd. 0.01% of their portfolio Seattle, WA 118,614118.6k $9.6m $9.6m 0.01% Added +47.0k +47,007
39 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 118,427118.4k $9.6m $9.6m 0.00% Added +343 +343
40 ZWJ INVESTMENT COUNSEL INC 0.29% of their portfolio Atlanta, GA 108,502108.5k $8.8m $8.8m 0.29% Added +4.7k +4,715
41 Creative Planning 0.00% of their portfolio OVERLAND PARK, KS 104,224104.2k $8.5m $8.5m 0.00% Added +66.6k +66,589
42 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 98,54998.5k $8.0m $8.0m 0.00% Reduced -122.3k -122,334
43 DEPRINCE RACE & ZOLLO INC 0.13% of their portfolio Winter Park, FL 93,34893.3k $7.6m $7.6m 0.13% Added +25.3k +25,319
44 FIRST TRUST ADVISORS LP 0.00% of their portfolio Wheaton, IL 91,25291.3k $7.4m $7.4m 0.00% Added +78.5k +78,536
45 TEACHER RETIREMENT SYSTEM OF TEXAS 0.02% of their portfolio AUSTIN, TX 85,46385.5k $7.0m $7.0m 0.02% Reduced -17.6k -17,639
46 Public Sector Pension Investment Board 0.02% of their portfolio MONTREAL, A8 84,57784.6k $6.9m $6.9m 0.02% Reduced -4.1k -4,117
47 HRT FINANCIAL LP 0.02% of their portfolio NEW YORK, NY 84,34984.3k $6.9m $6.9m 0.02% Reduced -40.7k -40,706
48 MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.07% of their portfolio New York, NY 82,92082.9k $6.7m $6.7m 0.07% Reduced -4.5k -4,543
49 FMR LLC 0.00% of their portfolio BOSTON, MA 82,75982.8k $6.7m $6.7m 0.00% Added +31.0k +30,954
50 ProShare Advisors LLC 0.01% of their portfolio BETHESDA, MD 81,23281.2k $6.6m $6.6m 0.01% Reduced -8.6k -8,609
51 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 73,45773.5k $6.0m $6.0m 0.00% Reduced -986 -986
52 SG Capital Management LLC 0.52% of their portfolio CHICAGO, IL 71,02271.0k $5.8m $5.8m 0.52% New
53 Numerai GP LLC 0.45% of their portfolio SAN FRANCISCO, CA 66,93166.9k $5.4m $5.4m 0.45% Reduced -9.7k -9,685
54 RHUMBLINE ADVISERS 0.00% of their portfolio BOSTON, MA 65,05565.1k $5.3m $5.3m 0.00% Reduced -6.1k -6,102
55 Trexquant Investment LP 0.03% of their portfolio STAMFORD, CT 60,52860.5k $4.9m $4.9m 0.03% Reduced -17.8k -17,842
56 Balyasny Asset Management L.P. 0.01% of their portfolio Chicago, IL 59,75159.8k $4.9m $4.9m 0.01% New
57 Legal & General Group Plc 0.00% of their portfolio London, X0 58,84158.8k $4.8m $4.8m 0.00% Reduced -279 -279
58 AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio KANSAS CITY, MO 55,09355.1k $4.5m $4.5m 0.00% Reduced -141 -141
59 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 54,51754.5k $4.4m $4.4m 0.00% Reduced -2.0k -2,018
60 Swiss National Bank 0.00% of their portfolio ZURICH, V8 49,90349.9k $4.1m $4.1m 0.00% Added +900 +900
61 IEQ CAPITAL, LLC 0.02% of their portfolio Foster City, CA 45,34345.3k $3.7m $3.7m 0.02% Added +5.4k +5,383
62 HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.01% of their portfolio TORONTO, A6 43,99544.0k $3.6m $3.6m 0.01% Reduced -17.7k -17,674
63 Point72 Asset Management, L.P. 0.01% of their portfolio STAMFORD, CT 42,64842.6k $3.5m $3.5m 0.01% Reduced -124.1k -124,146
64 Atom Investors LP 0.30% of their portfolio AUSTIN, TX 40,87040.9k $3.3m $3.3m 0.30% Added +99 +99
65 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 39,51439.5k $3.2m $3.2m 0.00% Added +1.5k +1,547
66 DARK FOREST CAPITAL MANAGEMENT LP 0.20% of their portfolio NEW YORK, NY 38,86238.9k $3.2m $3.2m 0.20% Added +13.2k +13,219
67 FRANKLIN RESOURCES INC 0.00% of their portfolio San Mateo, CA 38,74838.7k $3.2m $3.2m 0.00% Added +5.3k +5,263
68 INTECH INVESTMENT MANAGEMENT LLC 0.03% of their portfolio WEST PALM BEACH, FL 38,29238.3k $3.1m $3.1m 0.03% Reduced -6.7k -6,675
69 SG Americas Securities, LLC 0.00% of their portfolio NEW YORK, NY 37,66537.7k $3.1m $3.1m 0.00% Reduced -23.2k -23,203
70 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 37,34537.3k $3.0m $3.0m 0.00% Added +5.5k +5,519
71 ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.00% of their portfolio BOSTON, MA 34,87634.9k $2.8m $2.8m 0.00% Added +16.4k +16,379
72 CM Management, LLC 1.65% of their portfolio GULF BREEZE, FL 32,00032.0k $2.6m $2.6m 1.65% Added +8.0k +8,000
73 VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.01% of their portfolio JUPITER, FL 31,85731.9k $2.6m $2.6m 0.01% Reduced -76.1k -76,106
74 Cerity Partners LLC 0.00% of their portfolio NEW YORK, NY 31,31531.3k $2.5m $2.5m 0.00% Added +8.8k +8,802
75 PDT Partners, LLC 0.13% of their portfolio New York, NY 31,17631.2k $2.5m $2.5m 0.13% Reduced -3.4k -3,400
76 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 30,22130.2k $2.5m $2.5m 0.00% Added +12.6k +12,595
77 Edgestream Partners, L.P. 0.07% of their portfolio Princeton, NJ 29,20829.2k $2.4m $2.4m 0.07% Reduced -5.0k -5,018
78 Huber Capital Management LLC 0.35% of their portfolio EL SEGUNDO, CA 29,14829.1k $2.4m $2.4m 0.35% Added +4.0k +4,000
79 INGALLS & SNYDER LLC 0.06% of their portfolio NEW YORK, NY 28,92728.9k $2.4m $2.4m 0.06% Unchanged
80 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 28,62228.6k $2.1m $2.1m 0.00% Added +2.1k +2,113
81 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio WEST SACRAMENTO, CA 27,76527.8k $2.3m $2.3m 0.00% Added +236 +236
82 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 27,56527.6k $2.2m $2.2m 0.00% Added +4.8k +4,815
83 Mariner, LLC 0.00% of their portfolio Overland Park, KS 26,93526.9k $2.2m $2.2m 0.00% Added +7.2k +7,225
84 VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio ATLANTA, GA 25,91525.9k $2.1m $2.1m 0.00% Added +822 +822
85 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 25,69225.7k $2.1m $2.1m 0.00% Added +1.9k +1,900
86 PRUDENTIAL FINANCIAL INC 0.00% of their portfolio NEWARK, NJ 25,52925.5k $2.1m $2.1m 0.00% Added +260 +260
87 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 24,71324.7k $2.0m $2.0m 0.00% Added +3.5k +3,524
88 ExodusPoint Capital Management, LP 0.02% of their portfolio NEW YORK, NY 23,81023.8k $1.9m $1.9m 0.02% New
89 Holocene Advisors, LP 0.00% of their portfolio New York, NY 23,76023.8k $1.9m $1.9m 0.00% Reduced -2.7k -2,713
90 HSBC HOLDINGS PLC 0.00% of their portfolio LONDON, X0 23,69323.7k $1.9m $1.9m 0.00% Reduced -1.7k -1,658
91 Moran Wealth Management, LLC 0.05% of their portfolio NAPLES, FL 23,63923.6k $1.9m $1.9m 0.05% Reduced -3.4k -3,392
92 CONNORS INVESTOR SERVICES INC 0.16% of their portfolio WYOMISSING, PA 23,36323.4k $1.9m $1.9m 0.16% Reduced -9.7k -9,732
93 KLP KAPITALFORVALTNING AS 0.01% of their portfolio OSLO, Q8 23,30023.3k $1.9m $1.9m 0.01% Unchanged
94 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 23,07523.1k $1.9m $1.9m 0.00% Reduced -10.5k -10,451
95 WEDGE CAPITAL MANAGEMENT L L P/NC 0.03% of their portfolio CHARLOTTE, NC 20,32920.3k $1.7m $1.7m 0.03% Reduced -1.1k -1,144
96 XTX Topco Ltd 0.02% of their portfolio LONDON, X0 20,18820.2k $1.6m $1.6m 0.02% Reduced -16.1k -16,104
97 Linden Thomas Advisory Services, LLC 0.13% of their portfolio Charlotte, NC 19,81519.8k $1.6m $1.6m 0.13% Added +8.0k +8,005
98 VANGUARD ASSET MANAGEMENT, Ltd 0.00% of their portfolio London, EC4N 8AF, X0 19,56019.6k $1.6m $1.6m 0.00% Added +2.3k +2,281
99 CANADA LIFE ASSURANCE Co 0.00% of their portfolio WINNIPEG, A2 19,50819.5k $1.6m $1.6m 0.00% Reduced -797 -797
100 Blackstone Inc. 0.01% of their portfolio NEW YORK, NY 19,16319.2k $1.6m $1.6m 0.01% Not comparable