As of May 30, 2026, the three largest insider holders of IOSP are Patrick Williams (President Ceo, 231.53K shares), Patrick Williams (President Ceo, 166.51K shares), Ian Cleminson (Evp Cfo, 20.36K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Philip John Boon | Executive Vp Business Ops | 20,079 | 0 | 24 Feb, 2025 |
| Patrick Williams | President Ceo | 231,535 | 0 | 03 Mar, 2026 |
| Ian Cleminson | Evp Cfo | 20,357 | 0 | 06 Mar, 2026 |
| Robert I Paller | - | 14,343 | 0 | 28 Feb, 2024 |
| Milton C Blackmore | - | 10,530 | 0 | 06 Mar, 2026 |
| Larry Padfield | - | 9,453 | 0 | 06 Mar, 2026 |
| David Landless | - | 7,632 | 0 | 06 Mar, 2026 |
| Claudia Poccia | - | 6,508 | 0 | 06 Mar, 2026 |
| Elizabeth K Arnold | - | 6,376 | 0 | 25 Feb, 2026 |
| Corbin Barnes | Svp, Corporate Dev And Ir | 13,080 | 0 | 03 Mar, 2026 |
| Hardy Louis Iii Griffin | Svp, Human Resources | 10,161 | 0 | 03 Mar, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 27 Feb, 2026 | Claudia Poccia | Common Stock | D | 57 | $76.30 | 6,570 | D | S |
| 27 Feb, 2026 | David Landless | Common Stock | D | 287 | $76.30 | 7,939 | D | S |
| 27 Feb, 2026 | Ian Cleminson | Common Stock | D | 1,149 | $76.30 | 21,588 | D | S |
| 27 Feb, 2026 | Larry Padfield | Common Stock | D | 287 | $76.30 | 9,760 | D | S |
| 27 Feb, 2026 | Milton C Blackmore | Common Stock | D | 287 | $76.30 | 10,837 | D | S |
| 27 Feb, 2026 | Larry Padfield | Common Stock | D | 287 | $76.30 | 9,760 | D | S |
| 27 Feb, 2026 | Claudia Poccia | Common Stock | D | 57 | $76.30 | 6,570 | D | S |
| 27 Feb, 2026 | Larry Padfield | Common Stock | D | 307 | $76.79 | 9,453 | D | S |
| 27 Feb, 2026 | Claudia Poccia | Common Stock | D | 62 | $76.79 | 6,508 | D | S |
| 27 Feb, 2026 | Larry Padfield | Common Stock | D | 307 | $76.79 | 9,453 | D | S |
| 27 Feb, 2026 | Claudia Poccia | Common Stock | D | 62 | $76.79 | 6,508 | D | S |
| 27 Feb, 2026 | Ian Cleminson | Common Stock | D | 1,231 | $76.79 | 20,357 | D | S |
| 27 Feb, 2026 | David Landless | Common Stock | D | 307 | $76.79 | 7,632 | D | S |
| 27 Feb, 2026 | Milton C Blackmore | Common Stock | D | 307 | $76.79 | 10,530 | D | S |
| 27 Feb, 2026 | Larry Padfield | Common Stock | D | 594 | $76.56 | 9,453 | D | S |
| 27 Feb, 2026 | Patrick Williams | Common Stock | D | 7,966 | $78.34 | 231,535 | D | F |
| 27 Feb, 2026 | Claudia Poccia | Common Stock | D | 119 | $76.56 | 6,508 | D | S |
| 27 Feb, 2026 | David Landless | Common Stock | D | 594 | $76.56 | 7,632 | D | S |
| 27 Feb, 2026 | Larry Padfield | Common Stock | D | 594 | $76.56 | 9,453 | D | S |
| 27 Feb, 2026 | Claudia Poccia | Common Stock | D | 119 | $76.56 | 6,508 | D | S |