ONTO (Onto Innovation Inc.)
Insider Trading Activity
Every open-market purchase and sale reported by ONTO officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-25 | Susan D Lynch | Director | Sell | — | — |
| 2026-05-22 | Stephen Douglas Kelley | Director | A | — | — |
| 2026-05-22 | Susan D Lynch | Director | A | — | — |
| 2026-05-22 | DAVID BRIAN MILLER | Director | A | — | — |
| 2026-05-22 | STEPHEN S SCHWARTZ | Director | A | — | — |
| 2026-05-22 | CHRISTOPHER A SEAMS | Director | A | — | — |
| 2026-05-22 | May Su | Director | A | — | — |
| 2026-05-18 | Yoon Ah OH | SVP, Gen Counsel & Corp Sec | F | — | — |
| 2026-05-18 | RAMIL YALDAEI | Chief Operating Officer | F | — | — |
| 2026-03-04 | Shirley Chen | SVP Customer Success | A | — | — |
| 2026-03-04 | Yoon Ah OH | SVP, Gen Counsel & Corp Sec | MIXED | — | — |
| 2026-03-04 | Michael P Plisinski | Chief Executive Officer | MIXED | — | — |
| 2026-03-04 | RAMIL YALDAEI | Chief Operating Officer | MIXED | — | — |
| 2026-03-04 | Ido Dolev | EVP, Prod Solutions Grp | MIXED | — | — |
| 2026-03-04 | BRIAN K ROBERTS | Chief Financial Officer | A | — | — |
| 2026-03-03 | Yoon Ah OH | SVP, Gen Counsel & Corp Sec | MIXED | — | — |
| 2026-03-03 | Michael P Plisinski | Chief Executive Officer | MIXED | — | — |
| 2026-03-03 | RAMIL YALDAEI | Chief Operating Officer | MIXED | — | — |
| 2026-02-18 | Yoon Ah OH | SVP, Gen Counsel & Corp Sec | MIXED | — | — |
| 2026-02-18 | Michael P Plisinski | Chief Executive Officer | MIXED | — | — |
| 2025-12-29 | Michael P Plisinski | Chief Executive Officer | G | — | — |
| 2025-12-04 | Ido Dolev | EVP, Prod Solutions Grp | F | — | — |
| 2025-10-06 | RAMIL YALDAEI | Chief Operating Officer | F | — | — |
| 2025-09-03 | Shirley Chen | SVP, Customer Success | A | — | — |
| 2025-09-03 | BRIAN K ROBERTS | Chief Financial Officer | A | — | — |
| 2025-06-13 | Mark Slicer | Chief Financial Officer | — | — | — |
| 2025-06-04 | Ido Dolev | EVP, Prod Solutions Grp | A | — | — |
| 2025-05-23 | Stephen Douglas Kelley | Director | A | — | — |
| 2025-05-23 | Susan D Lynch | Director | A | — | — |
| 2025-05-23 | DAVID BRIAN MILLER | Director | A | — | — |
| 2025-05-23 | STEPHEN S SCHWARTZ | Director | A | — | — |
| 2025-05-23 | CHRISTOPHER A SEAMS | Director | A | — | — |
| 2025-05-23 | May Su | Director | A | — | — |
| 2025-05-23 | LEO BERLINGHIERI | Director | — | — | — |
| 2025-05-23 | CHRISTINE A TSINGOS | Director | — | — | — |
| 2025-05-19 | Yoon Ah OH | SVP, Gen Counsel & Corp Sec | F | — | — |
| 2025-05-19 | RAMIL YALDAEI | Chief Operating Officer | F | — | — |
| 2025-05-19 | Mark Slicer | Chief Financial Officer | F | — | — |
| 2025-04-09 | Srinivas Vedula | SVP Customer Success | — | — | — |
| 2025-03-05 | Yoon Ah OH | SVP, Gen Counsel & Corp Sec | A | — | — |
| 2025-03-05 | Michael P Plisinski | CEO | A | — | — |
| 2025-03-05 | Mark Slicer | Chief Financial Officer | A | — | — |
| 2025-03-05 | Srinivas Vedula | SVP, Customer Success | A | — | — |
| 2025-03-05 | RAMIL YALDAEI | Chief Operating Officer | A | — | — |
| 2025-03-03 | Yoon Ah OH | SVP, Gen Counsel & Corp Sec | F | — | — |
| 2025-03-03 | Michael P Plisinski | CEO | F | — | — |
| 2025-03-03 | Mark Slicer | Chief Financial Officer | F | — | — |
| 2025-03-03 | Srinivas Vedula | SVP, Customer Success | F | — | — |
| 2025-03-03 | RAMIL YALDAEI | Chief Operating Officer | F | — | — |
| 2025-02-19 | Srinivas Vedula | SVP, Customer Success | MIXED | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | President and CEO | 211,553 | — |
| — | Director | 209,143 | — |
| — | Chief Executive Officer | 182,984 | — |
| — | Director | 44,739 | — |
| — | Director | 42,918 | — |
| — | — | 39,555 | — |
| — | Director | 38,513 | — |
| — | VP & General Counsel | 33,619 | — |
| — | — | 32,538 | — |
| — | — | 31,867 | — |
| — | General Counsel | 30,110 | — |
| — | Director | 28,560 | — |
| — | EVP, Prod Solutions Grp | 27,355 | — |
| — | SVP, Business Operations | 27,046 | — |
| — | — | 26,944 | — |
| — | — | 24,339 | — |
| — | Chief Financial Officer | 24,271 | — |
| — | Sr VP & CFO | 23,043 | — |
| — | SVP, Gen Counsel & Corp Sec | 21,110 | — |
| — | Director | 20,618 | — |
| — | Director | 20,210 | — |
| — | SVP Customer Success | 18,730 | — |
| — | Chief Operating Officer | 17,593 | — |
| — | Director | 17,276 | — |
| — | — | 16,767 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the ONTO quote page; the site-wide leaderboard is on the insider transactions hub.