Onto Innovation Inc. (ONTO) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, Onto Innovation's top three insider holders are Michael P Plisinski (Chief Executive Officer, 179.24K shares), Edward J Jr Brown (Director, 44.74K shares), Christine A Tsingos (Director, 42.92K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Michael P Plisinski Chief Executive Officer 179,242 0 04 Mar, 2026
Edward J Jr Brown 44,739 0 12 May, 2021
Christine A Tsingos 42,918 0 23 May, 2024
Christopher A Seams 37,752 0 23 May, 2025
Rollin Kocher 33,896 0 08 Sep, 2021
Rodney Smedt 31,998 0 02 Jun, 2021
Ido Dolev Evp, Prod Solutions Grp 26,536 0 04 Mar, 2026
Brian K Roberts Chief Financial Officer 24,271 0 04 Mar, 2026
Steven R Roth Sr Vp Cfo 23,043 0 13 Feb, 2022
Yoon Ah Oh Svp, Gen Counsel Corp Sec 21,640 0 04 Mar, 2026
Kevin Heidrich 20,470 0 15 Jun, 2021
Leo Berlinghieri 20,210 0 23 May, 2024
Srinivas Vedula Svp, Customer Success 18,730 0 05 Mar, 2025
Ramil Yaldaei Chief Operating Officer 18,436 0 04 Mar, 2026
Shirley Chen Svp Customer Success 15,517 0 04 Mar, 2026
Mark Slicer Chief Financial Officer 13,640 0 19 May, 2025
David Brian Miller 11,931 0 23 May, 2025
Ju Jin Svp Gm, Ibu 10,254 0 16 Jun, 2023
Robert Fiordalice Svp Gm, Metrology Bu 8,763 0 05 Mar, 2024
James Harlow Chief Operating Officer 8,586 0 15 Feb, 2023
May Su 7,223 0 23 May, 2025
Stephen Douglas Kelley 5,623 0 23 May, 2025
Dean Iacopetti 5,338 0 28 Jun, 2021
Karen M Rogge 5,150 0 11 May, 2023
Bruce C Rhine 3,500 0 17 Feb, 2022
D Mayson Brooks Vice President Gm, Ibu 3,025 0 04 Sep, 2024
Susan D Lynch 2,923 0 23 May, 2025
Stephen S Schwartz 2,775 0 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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
02 Mar, 2026 Ido Dolev Common Stock A 3,440 $0.00 27,355 D A
02 Mar, 2026 Yoon Ah Oh Common Stock A 2,408 $0.00 22,057 D A
02 Mar, 2026 Ramil Yaldaei Common Stock A 7,683 $0.00 19,051 D A
02 Mar, 2026 Brian K Roberts Common Stock A 3,096 $0.00 24,271 D A
02 Mar, 2026 Shirley Chen Common Stock A 2,523 $0.00 15,517 D A
02 Mar, 2026 Michael P Plisinski Common Stock A 14,479 $0.00 182,984 D A
02 Mar, 2026 Shirley Chen Performance Stock Unit A 1,261 $0.00 1,261 D A
03 Mar, 2026 Ido Dolev Common Stock D 819 $207.50 26,536 D F
03 Mar, 2026 Michael P Plisinski Common Stock D 3,742 $207.50 179,242 D F
03 Mar, 2026 Ramil Yaldaei Common Stock D 615 $207.50 18,436 D F
02 Mar, 2026 Brian K Roberts Performance Stock Unit A 1,548 $0.00 1,548 D A
03 Mar, 2026 Yoon Ah Oh Common Stock D 417 $207.50 21,640 D F
02 Mar, 2026 Ramil Yaldaei Performance Stock Unit A 1,548 $0.00 1,548 D A
02 Mar, 2026 Michael P Plisinski Performance Stock Unit A 7,239 $0.00 7,239 D A
02 Mar, 2026 Ido Dolev Performance Stock Unit A 1,720 $0.00 1,720 D A
02 Mar, 2026 Brian K Roberts Performance Stock Unit A 1,548 $0.00 1,548 D A
02 Mar, 2026 Shirley Chen Performance Stock Unit A 1,261 $0.00 1,261 D A
02 Mar, 2026 Yoon Ah Oh Performance Stock Unit A 1,204 $0.00 1,204 D A
02 Mar, 2026 Yoon Ah Oh Performance Stock Unit A 1,204 $0.00 1,204 D A
02 Mar, 2026 Michael P Plisinski Performance Stock Unit A 7,239 $0.00 7,239 D A