Through the 90-day period concluding January 16, 2026, Onto Innovation's top three insider stakeholders include Chief Executive Officer Michael P Plisinski (162.16K shares), Director Edward J Jr Brown (44.74K shares), Director Christine A Tsingos (42.92K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Michael P Plisinski | Chief Executive Officer | 162,161 | 29 Dec, 2025 |
| Edward J Jr Brown | 44,739 | 12 May, 2021 | |
| Christine A Tsingos | 42,918 | 23 May, 2024 | |
| Christopher A Seams | 37,752 | 23 May, 2025 | |
| Rollin Kocher | 33,896 | 08 Sep, 2021 | |
| Rodney Smedt | 31,998 | 02 Jun, 2021 | |
| Ido Dolev | Evp And Prod Solutions Grp | 23,915 | 04 Dec, 2025 |
| Steven R Roth | Sr Vp & Cfo | 23,043 | 14 Feb, 2022 |
| Brian K Roberts | Chief Financial Officer | 21,175 | 03 Sep, 2025 |
| Kevin Heidrich | 20,470 | 15 Jun, 2021 | |
| Leo Berlinghieri | 20,210 | 23 May, 2024 | |
| Srinivas Vedula | Svp And Customer Success | 18,730 | 05 Mar, 2025 |
| Yoon Ah Oh | Svp And Gen Counsel & Corp Sec | 18,010 | 16 May, 2025 |
| Mark Slicer | Chief Financial Officer | 13,640 | 19 May, 2025 |
| Shirley Chen | Svp And Customer Success | 12,994 | 03 Sep, 2025 |
| David Brian Miller | 11,931 | 23 May, 2025 | |
| Ramil Yaldaei | Chief Operating Officer | 11,342 | 06 Oct, 2025 |
| Ju Jin | Svp & Gm And Ibu | 10,254 | 16 Jun, 2023 |
| Robert Fiordalice | Svp & Gm And Metrology Bu | 8,763 | 05 Mar, 2024 |
| James Harlow | Chief Operating Officer | 8,586 | 16 Feb, 2023 |
| May Su | 7,223 | 23 May, 2025 | |
| Stephen Douglas Kelley | 5,623 | 23 May, 2025 | |
| Dean Iacopetti | 5,338 | 30 Jun, 2021 | |
| Karen M Rogge | 5,150 | 11 May, 2023 | |
| Bruce C Rhine | 3,500 | 17 Feb, 2022 | |
| D Mayson Brooks | Vice President & Gm And Ibu | 3,025 | 04 Sep, 2024 |
| Susan D Lynch | 2,923 | 23 May, 2025 | |
| Stephen S Schwartz | 2,775 | 23 May, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 24 Dec, 2025 | Michael P Plisinski | Common Stock | D | 25,000 | $0.00 | 162,161 | D | G |
| 02 Dec, 2025 | Ido Dolev | Common Stock | D | 3,183 | $154.01 | 23,915 | D | F |
| 03 Oct, 2025 | Ramil Yaldaei | Common Stock | D | 594 | $143.71 | 11,342 | D | F |
| 02 Sep, 2025 | Brian K Roberts | - | - | 21,175 | D | |||
| 02 Sep, 2025 | Brian K Roberts | Common Stock | A | 21,175 | $0.00 | 21,175 | D | A |
| 02 Sep, 2025 | Shirley Chen | Common Stock | A | 12,994 | $0.00 | 12,994 | D | A |
| 02 Jun, 2025 | Ido Dolev | - | - | 21,562 | D | |||
| 02 Jun, 2025 | Ido Dolev | Common Stock | A | 21,562 | $0.00 | 21,562 | D | A |
| 02 Jun, 2025 | Ido Dolev | - | - | 26,953 | D | |||
| 02 Jun, 2025 | Ido Dolev | Common Stock | A | 5,391 | $0.00 | 26,953 | D | A |
| 21 May, 2025 | Christopher A Seams | Common Stock | A | 2,114 | $0.00 | 37,752 | D | A |
| 21 May, 2025 | David Brian Miller | Common Stock | A | 2,114 | $0.00 | 11,931 | D | A |
| 21 May, 2025 | Stephen S Schwartz | Common Stock | A | 2,114 | $0.00 | 2,775 | D | A |
| 21 May, 2025 | Stephen Douglas Kelley | Common Stock | A | 2,114 | $0.00 | 5,623 | D | A |
| 21 May, 2025 | Susan D Lynch | Common Stock | A | 2,114 | $0.00 | 2,923 | D | A |
| 21 May, 2025 | Susan D Lynch | - | - | 2,923 | D | |||
| 21 May, 2025 | May Su | Common Stock | A | 2,114 | $0.00 | 7,223 | D | A |
| 17 May, 2025 | Mark Slicer | Common Stock | D | 2,066 | $99.40 | 13,640 | D | F |
| 17 May, 2025 | Mark Slicer | - | - | 13,640 | D | |||
| 15 May, 2025 | Yoon Ah Oh | Common Stock | D | 603 | $98.04 | 18,010 | D | F |