Comparable stake leader
BlackRock, Inc.
SEC ownership of INNOSPEC INC.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001054905.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- IOSP on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001054905
- Issuer location
- Englewood, CO
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of INNOSPEC INC. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 15%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 15%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
15%
VANGUARD PORTFOLIO MANAGEMENT LLC
7.5%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
WASATCH ADVISORS LP
2.1%
Patrick Williams
0.93%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
13F
Company
|
15%
|
$330,981,773
3,681,666 shares
|
$0 | 31 Mar 2025 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
7.5%
|
$136,565,947
1,870,254 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.2%
|
$94,940,166
1,300,194 shares
|
$0 | 31 Mar 2026 |
| WASATCH ADVISORS LP |
13D/G
|
2.1%
|
$47,480,146
528,144 shares
|
-$94,572,193 | 31 Mar 2025 |
| Patrick Williams |
3/4/5
PRESIDENT & CEO
|
0.93%
|
$18,138,451
231,535 shares
|
— | 27 Feb 2026 |
| Ian Philip Cleminson |
3/4/5
EVP & CFO
|
0.08%
|
$1,563,214
20,357 shares
|
-$182,197 | 27 Feb 2026 |
| David Bentley Jones |
3/4/5
SVP, GC & CCO
|
0.06%
|
$1,111,378
14,693 shares
|
-$77,758 | 27 Feb 2026 |
| Corbin Barnes |
3/4/5
SVP, Corporate Dev and IR
|
0.05%
|
$1,024,656
13,080 shares
|
— | 27 Feb 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$548,885.
Buys
$25,191
Insiders: 1
Sells
$574,075
Insiders: 6
Net
-$548,885
Shares: -7,029
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 340
Shares: 7,369
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 7,369 | $0 | $574,075 | -$574,075 |
| 6-9 | 340 | 0 | $25,191 | $0 | +$25,191 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-17 of 17 reporting-owner rows connected to INNOSPEC INC.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
17
Largest Forms 3/4/5 holder
Patrick Williams
Net 12M change
-$548,885
Latest report
27 Feb 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Patrick Williams | President & Ceo | $18,138,451 | Mixed | 27 Feb 2026 | ||
| Brian Robert Watt | VP, Strat Plan & Regulatory | $2,551,166 | Mixed | 10 May 2021 | ||
| Philip John Boon | Executive VP Business Ops | $2,074,185 | Filing P/S | 21 Feb 2025 | ||
| Robert I. Paller | Director | $1,788,941 | Mixed | 26 Feb 2024 | ||
| Ian Philip Cleminson | Evp & Cfo | $1,563,214 | -$182,197 | -10% | Filing P/S | 27 Feb 2026 |
| Catherine Hessner | Senior VP - Human Resources | $1,542,844 | Mixed | 10 May 2021 | ||
| David Bentley Jones | Svp, Gc & Cco | $1,111,378 | -$77,758 | -6.5% | Filing P/S | 27 Feb 2026 |
| Corbin Barnes | SVP, Corporate Dev and IR | $1,024,656 | Mixed | 27 Feb 2026 | ||
| Milton C. Blackmore | Director | $808,598 | -$129,769 | -14% | Filing P/S | 27 Feb 2026 |
| Hardy L. Griffin | Svp, Human Resources | $796,012 | Mixed | 27 Feb 2026 | ||
| Larry Padfield | Director | $725,895 | -$129,769 | -15% | Filing P/S | 27 Feb 2026 |
| David Landless | Director | $586,061 | -$45,473 | -7.2% | Filing P/S | 27 Feb 2026 |
| Leslie J. Parrette | Director | $579,827 | +$25,191 | +4.5% | Mixed | 23 Feb 2026 |
| Elizabeth K. Arnold | Director | $501,217 | Mixed | 23 Feb 2026 | ||
| Claudia Poccia | Director | $499,749 | -$9,110 | -1.8% | Filing P/S | 27 Feb 2026 |
| Ian Malcolm McRobbie | Senior VP R&T | Mixed | 23 Feb 2026 | |||
| Graeme Blair | Head of Group Finance | Mixed | 23 Feb 2026 |
Recent insider transactions for INNOSPEC INC.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| David Bentley Jones | IOSP | Common Stock | Sale | -6.54% | $77,758 | $75.64 | -1,028 | 14,693 | 03 Mar 2026 | Direct |
| Milton C. Blackmore | IOSP | Common Stock | Sale | -5.34% | $45,473 | $76.55 | -594 | 10,530 | 27 Feb 2026 | Direct |
| Larry Padfield | IOSP | Common Stock | Sale | -5.91% | $45,473 | $76.55 | -594 | 9,453 | 27 Feb 2026 | Direct |
| Claudia Poccia | IOSP | Common Stock | Sale | -1.8% | $9,110 | $76.56 | -119 | 6,508 | 27 Feb 2026 | Direct |
| David Landless | IOSP | Common Stock | Sale | -7.22% | $45,473 | $76.55 | -594 | 7,632 | 27 Feb 2026 | Direct |
| Ian Philip Cleminson | IOSP | Common Stock | Sale | -10.5% | $182,197 | $76.55 | -2,380 | 20,357 | 27 Feb 2026 | Direct |
| Hardy L. Griffin | IOSP | Common Stock | Tax liability | -3.8% | -401 | 10,161 | 27 Feb 2026 | Direct | ||
| David Bentley Jones | IOSP | Common Stock | Tax liability | -5.27% | -875 | 15,721 | 27 Feb 2026 | Direct | ||
| Corbin Barnes | IOSP | Common Stock | Tax liability | -1.25% | -166 | 13,080 | 27 Feb 2026 | Direct | ||
| Patrick Williams | IOSP | Common Stock | Tax liability | -3.33% | -7,966 | 231,535 | 27 Feb 2026 | Direct | ||
| Corbin Barnes | IOSP | Common Stock | Award | 23% | 2,481 | 13,246 | 23 Feb 2026 | Direct | ||
| Hardy L. Griffin | IOSP | Common Stock | Award | 31.4% | 2,521 | 10,562 | 23 Feb 2026 | Direct | ||
| Ian Philip Cleminson | IOSP | Common Stock | Award | 24.7% | 4,499 | 22,737 | 23 Feb 2026 | Direct | ||
| Patrick Williams | IOSP | Common Stock | Award | 9.53% | 20,846 | 239,501 | 23 Feb 2026 | Direct | ||
| David Bentley Jones | IOSP | Common Stock | Award | 22% | 2,993 | 16,596 | 23 Feb 2026 | Direct | ||
| Graeme Blair | IOSP | Phantom Stock | Award | 520 | 520 | 23 Feb 2026 | Direct | |||
| Ian Malcolm McRobbie | IOSP | Phantom Stock | Award | 2,228 | 2,228 | 23 Feb 2026 | Direct | |||
| Elizabeth K. Arnold | IOSP | Common Stock | Award | 31.8% | 1,539 | 6,376 | 23 Feb 2026 | Direct | ||
| Leslie J. Parrette | IOSP | Common Stock | Award | 26.4% | 1,539 | 7,376 | 23 Feb 2026 | Direct | ||
| David Landless | IOSP | Common Stock | Award | 23% | 1,539 | 8,226 | 23 Feb 2026 | Direct | ||
| Claudia Poccia | IOSP | Common Stock | Award | 30.2% | 1,539 | 6,627 | 23 Feb 2026 | Direct | ||
| Milton C. Blackmore | IOSP | Common Stock | Award | 16.1% | 1,539 | 11,124 | 23 Feb 2026 | Direct | ||
| Larry Padfield | IOSP | Common Stock | Award | 18.1% | 1,539 | 10,047 | 23 Feb 2026 | Direct | ||
| Milton C. Blackmore | IOSP | Common Stock | Sale | -9.7% | $84,296 | $81.84 | -1,030 | 9,585 | 20 Feb 2026 | Direct |
| Milton C. Blackmore | IOSP | Common Stock | Options Exercise | 10.8% | 1,030 | 10,615 | 20 Feb 2026 | Direct | ||
| Milton C. Blackmore | IOSP | Stock Option | Options Exercise | -100% | -1,030 | 0 | 20 Feb 2026 | Direct | ||
| Larry Padfield | IOSP | Common Stock | Sale | -10.8% | $84,296 | $81.84 | -1,030 | 8,508 | 20 Feb 2026 | Direct |
| Larry Padfield | IOSP | Common Stock | Options Exercise | 12.1% | 1,030 | 9,538 | 20 Feb 2026 | Direct | ||
| Larry Padfield | IOSP | Stock Option | Options Exercise | -100% | -1,030 | 0 | 20 Feb 2026 | Direct | ||
| Corbin Barnes | IOSP | Common Stock | Award | 19.2% | 1,730 | 10,765 | 16 Feb 2026 | Direct | ||
| Hardy L. Griffin | IOSP | Common Stock | Award | 19.3% | 1,299 | 8,041 | 16 Feb 2026 | Direct | ||
| Ian Philip Cleminson | IOSP | Common Stock | Award | 15% | 2,380 | 18,238 | 16 Feb 2026 | Direct | ||
| Patrick Williams | IOSP | Common Stock | Award | 9.5% | 18,966 | 218,655 | 16 Feb 2026 | Direct | ||
| David Bentley Jones | IOSP | Common Stock | Award | 16.3% | 1,903 | 13,603 | 16 Feb 2026 | Direct | ||
| Corbin Barnes | IOSP | Common Stock | Small acquisition under Rule 16a-6 | 0.22% | 19.87 | 9,035 | 26 Nov 2025 | Direct | ||
| Leslie J. Parrette | IOSP | Common Stock | Purchase | 6.19% | $25,191 | $74.09 | 340 | 5,837 | 14 Nov 2025 | Direct |
* marks a reported price that did not pass the local price check.