SEC Form 4 · Updated Daily

ONTO

— ONTO INNOVATION INC. Ownership

Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.

Financials Ownership

Current Reporting Owners

Owner	Role	Shares Owned	As Of	Last Activity
Plisinski Michael P	Director · Officer	179,242	2026-03-03	F
SEAMS CHRISTOPHER A	Director	38,513	2026-05-20	A
Dolev Ido	Officer	26,536	2026-03-03	F
OH Yoon Ah	Officer	21,110	2026-05-15	F
ROBERTS BRIAN K	Officer	21,032	2026-09-02	F
Vedula Srinivas	Officer	18,730	2025-03-03	A
YALDAEI RAMIL	Officer	17,593	2026-05-15	F
Chen Shirley	Officer	14,001	2026-09-02	F
Slicer Mark	Officer	13,640	2025-05-17	F
MILLER DAVID BRIAN	Director	12,692	2026-05-20	A
Su May	Director	7,984	2026-05-20	A
Kelley Stephen Douglas	Director	6,384	2026-05-20	A
SCHWARTZ STEPHEN S	Director	3,536	2026-05-20	A
Lynch Susan D	Director	2,684	2026-08-21	S

Recent Filings

Date	Owner	Activity	Shares	Price	Owned After
2026-09-02	ROBERTS BRIAN K	Tax withholding	3,239	$254.55	21,032
2026-09-02	Chen Shirley	Tax withholding	1,516	$254.55	14,001
2026-09-02	ROBERTS BRIAN K	Tax withholding	3,239	$254.55	21,032
2026-08-21	Lynch Susan D	Open-market sale	1,000	$302.30	2,684
2026-05-20	Kelley Stephen Douglas	Grant / award	761	$0.00	6,384
2026-05-20	Lynch Susan D	Grant / award	761	$0.00	3,684
2026-05-20	MILLER DAVID BRIAN	Grant / award	761	$0.00	12,692
2026-05-20	SCHWARTZ STEPHEN S	Grant / award	761	$0.00	3,536
2026-05-20	SEAMS CHRISTOPHER A	Grant / award	761	$0.00	38,513
2026-05-20	Su May	Grant / award	761	$0.00	7,984
2026-05-15	OH Yoon Ah	Tax withholding	530	$271.77	21,110
2026-05-15	YALDAEI RAMIL	Tax withholding	625	$271.77	17,593
2026-05-15	YALDAEI RAMIL	Tax withholding	218	$271.77	18,218
2026-03-03	OH Yoon Ah	Tax withholding	417	$207.50	21,640
2026-03-03	Plisinski Michael P	Tax withholding	3,742	$207.50	179,242
2026-03-03	YALDAEI RAMIL	Tax withholding	615	$207.50	18,436
2026-03-03	Dolev Ido	Tax withholding	819	$207.50	26,536
2026-03-02	Chen Shirley	Grant / award (derivative)	1,261	$0.00	1,261
2026-03-02	Chen Shirley	Grant / award	2,523	$0.00	15,517
2026-03-02	OH Yoon Ah	Grant / award (derivative)	1,204	$0.00	1,204
2026-03-02	OH Yoon Ah	Grant / award	2,408	$0.00	22,057
2026-03-02	Plisinski Michael P	Grant / award (derivative)	7,239	$0.00	7,239
2026-03-02	Plisinski Michael P	Grant / award	14,479	$0.00	182,984
2026-03-02	YALDAEI RAMIL	Grant / award (derivative)	1,548	$0.00	1,548
2026-03-02	YALDAEI RAMIL	Grant / award	7,683	$0.00	19,051
2026-03-02	Dolev Ido	Grant / award (derivative)	1,720	$0.00	1,720
2026-03-02	Dolev Ido	Grant / award	3,440	$0.00	27,355
2026-03-02	ROBERTS BRIAN K	Grant / award (derivative)	1,548	$0.00	1,548
2026-03-02	ROBERTS BRIAN K	Grant / award	3,096	$0.00	24,271
2026-03-01	OH Yoon Ah	Option exercise (derivative)	941	$0.00	0
2026-03-01	OH Yoon Ah	Tax withholding	267	$215.89	19,649
2026-03-01	OH Yoon Ah	Tax withholding	307	$215.89	19,916
2026-03-01	OH Yoon Ah	Option exercise	724	$0.00	20,223
2026-03-01	Plisinski Michael P	Option exercise (derivative)	5,971	$0.00	0
2026-03-01	Plisinski Michael P	Tax withholding	1,925	$215.89	168,505
2026-03-01	Plisinski Michael P	Tax withholding	2,222	$215.89	170,430
2026-03-01	Plisinski Michael P	Option exercise	4,597	$0.00	172,652
2026-03-01	YALDAEI RAMIL	Option exercise (derivative)	844	$0.00	0
2026-03-01	YALDAEI RAMIL	Tax withholding	276	$215.89	11,368
2026-03-01	YALDAEI RAMIL	Tax withholding	347	$215.89	11,644

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.