Understand Stock

$ONTO

$259.00 +$0.42 (0.16%)

Deep Research with AI Research

Overview

$ONTO Overview Financials SEC Filings Executives News

Specialized Tools

Valuations P Insider Transactions P Congressional Trades P

Insider Transactions

Insider Transaction Summary

Timothy J Stultz

209,143 shares

Net: 0 B/S: -

Michael P Plisinski

179,242 shares

Net: -2,362 B/S: ∞

Pierre-Yves Lesaicherre

101,606 shares

Net: 0 B/S: -

Jeff Andreson

71,919 shares

Net: 0 B/S: -

J THOMAS BENTLEY

71,612 shares

Net: 0 B/S: -

Bruce C Rhine

52,383 shares

Net: 0 B/S: -

Edward J Jr Brown

44,739 shares

Net: 0 B/S: -

Rollin Kocher

44,106 shares

Net: 0 B/S: -

CHRISTINE A TSINGOS

42,918 shares

Net: 0 B/S: -

CHRISTOPHER A SEAMS

38,513 shares

Net: +761 B/S: ∞

Stanislaw M. Borowicz

36,934 shares

Net: 0 B/S: -

Jonathan Chou

34,741 shares

Net: 0 B/S: -

ROBERT ALAN KOCH

33,619 shares

Net: 0 B/S: -

RODNEY SMEDT

31,998 shares

Net: 0 B/S: -

Janet Therese Taylor

30,110 shares

Net: 0 B/S: -

Kevin Heidrich

27,187 shares

Net: 0 B/S: -

James Barnhart

27,046 shares

Net: 0 B/S: -

Ido Dolev

26,536 shares

Net: -562 B/S: ∞

BRIAN K ROBERTS

24,271 shares

Net: +24,271 B/S: ∞

Silveira Elvino M da

23,218 shares

Net: 0 B/S: -

STEVEN R ROTH

23,043 shares

Net: 0 B/S: -

Yoon Ah OH

21,110 shares

Net: +3,868 B/S: ∞

LEO BERLINGHIERI

20,210 shares

Net: 0 B/S: -

Srinivas Vedula

18,730 shares

Net: 0 B/S: -

JOHN R WHITTEN

18,618 shares

Net: 0 B/S: -

RAMIL YALDAEI

18,218 shares

Net: +6,558 B/S: ∞

ROBERT G DEUSTER

17,276 shares

Net: 0 B/S: -

Shirley Chen

15,517 shares

Net: +15,517 B/S: ∞

Chun Hoy Chan

15,072 shares

Net: 0 B/S: -

Mark Slicer

13,640 shares

Net: 0 B/S: -

DAVID BRIAN MILLER

12,692 shares

Net: +761 B/S: ∞

Greg Swyt

11,680 shares

Net: 0 B/S: -

Vita A Cassese

11,233 shares

Net: 0 B/S: -

Ju Jin

10,254 shares

Net: 0 B/S: -

Dean Iacopetti

9,695 shares

Net: 0 B/S: -

Erich J Lehmann

9,557 shares

Net: 0 B/S: -

Robert Fiordalice

8,763 shares

Net: 0 B/S: -

James Harlow

8,586 shares

Net: 0 B/S: -

Jeffrey A. Aukerman

8,097 shares

Net: 0 B/S: -

May Su

7,984 shares

Net: +761 B/S: ∞

Stephen Douglas Kelley

6,384 shares

Net: +761 B/S: ∞

KAREN M ROGGE

5,150 shares

Net: 0 B/S: -

Susan D Lynch

3,684 shares

Net: +761 B/S: ∞

STEPHEN S SCHWARTZ

3,536 shares

Net: +761 B/S: ∞

BARRY HARTUNIAN

3,058 shares

Net: 0 B/S: -

D MAYSON BROOKS

3,025 shares

Net: 0 B/S: -

Leonard A LaBua

1,473 shares

Net: 0 B/S: -

George C Murray

878 shares

Net: 0 B/S: -

Michael Sheaffer

514 shares

Net: 0 B/S: -

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
Timothy J Stultz	209,143	0	-
Michael P Plisinski	179,242	-2,362	∞
Pierre-Yves Lesaicherre	101,606	0	-
Jeff Andreson	71,919	0	-
J THOMAS BENTLEY	71,612	0	-
Bruce C Rhine	52,383	0	-
Edward J Jr Brown	44,739	0	-
Rollin Kocher	44,106	0	-
CHRISTINE A TSINGOS	42,918	0	-
CHRISTOPHER A SEAMS	38,513	+761	∞
Stanislaw M. Borowicz	36,934	0	-
Jonathan Chou	34,741	0	-
ROBERT ALAN KOCH	33,619	0	-
RODNEY SMEDT	31,998	0	-
Janet Therese Taylor	30,110	0	-
Kevin Heidrich	27,187	0	-
James Barnhart	27,046	0	-
Ido Dolev	26,536	-562	∞
BRIAN K ROBERTS	24,271	+24,271	∞
Silveira Elvino M da	23,218	0	-
STEVEN R ROTH	23,043	0	-
Yoon Ah OH	21,110	+3,868	∞
LEO BERLINGHIERI	20,210	0	-
Srinivas Vedula	18,730	0	-
JOHN R WHITTEN	18,618	0	-
RAMIL YALDAEI	18,218	+6,558	∞
ROBERT G DEUSTER	17,276	0	-
Shirley Chen	15,517	+15,517	∞
Chun Hoy Chan	15,072	0	-
Mark Slicer	13,640	0	-
DAVID BRIAN MILLER	12,692	+761	∞
Greg Swyt	11,680	0	-
Vita A Cassese	11,233	0	-
Ju Jin	10,254	0	-
Dean Iacopetti	9,695	0	-
Erich J Lehmann	9,557	0	-
Robert Fiordalice	8,763	0	-
James Harlow	8,586	0	-
Jeffrey A. Aukerman	8,097	0	-
May Su	7,984	+761	∞
Stephen Douglas Kelley	6,384	+761	∞
KAREN M ROGGE	5,150	0	-
Susan D Lynch	3,684	+761	∞
STEPHEN S SCHWARTZ	3,536	+761	∞
BARRY HARTUNIAN	3,058	0	-
D MAYSON BROOKS	3,025	0	-
Leonard A LaBua	1,473	0	-
George C Murray	878	0	-
Michael Sheaffer	514	0	-

Individual Transactions

May 20, 2026

CHRISTOPHER A SEAMS

Grant/Award Acquisition

Change: +761

Price: $0.00

Shares: 38,513

Value: +$0

DAVID BRIAN MILLER

Grant/Award Acquisition

Change: +761

Price: $0.00

Shares: 12,692

Value: +$0

STEPHEN S SCHWARTZ

Grant/Award Acquisition

Change: +761

Price: $0.00

Shares: 3,536

Value: +$0

Stephen Douglas Kelley

Grant/Award Acquisition

Change: +761

Price: $0.00

Shares: 6,384

Value: +$0

Susan D Lynch

Grant/Award Acquisition

Change: +761

Price: $0.00

Shares: 3,684

Value: +$0

May Su

Grant/Award Acquisition

Change: +761

Price: $0.00

Shares: 7,984

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
CHRISTOPHER A SEAMS	May 22	Grant/Award Acquisition (A) Compensation/Award	38,513	+761	$0.00	+$0
DAVID BRIAN MILLER	May 22	Grant/Award Acquisition (A) Compensation/Award	12,692	+761	$0.00	+$0
STEPHEN S SCHWARTZ	May 22	Grant/Award Acquisition (A) Compensation/Award	3,536	+761	$0.00	+$0
Stephen Douglas Kelley	May 22	Grant/Award Acquisition (A) Compensation/Award	6,384	+761	$0.00	+$0
Susan D Lynch	May 22	Grant/Award Acquisition (A) Compensation/Award	3,684	+761	$0.00	+$0
May Su	May 22	Grant/Award Acquisition (A) Compensation/Award	7,984	+761	$0.00	+$0

May 15, 2026

Yoon Ah OH

Tax Payment

Change: -530

Price: $271.77

Shares: 21,110

Value: -$144,038

RAMIL YALDAEI

Tax Payment

Change: -218

Price: $271.77

Shares: 18,218

Value: -$59,245

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Yoon Ah OH	May 18	Tax Payment (F) Tax Payment	21,110	-530	$271.77	-$144,038
RAMIL YALDAEI	May 18	Tax Payment (F) Tax Payment	18,218	-218	$271.77	-$59,245

March 03, 2026

Ido Dolev

Tax Payment

Change: -819

Price: $207.50

Shares: 26,536

Value: -$169,942

RAMIL YALDAEI

Tax Payment

Change: -615

Price: $207.50

Shares: 18,436

Value: -$127,612

Yoon Ah OH

Tax Payment

Change: -417

Price: $207.50

Shares: 21,640

Value: -$86,527

Michael P Plisinski

Tax Payment

Change: -3,742

Price: $207.50

Shares: 179,242

Value: -$776,465

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Ido Dolev	Mar 04	Tax Payment (F) Tax Payment	26,536	-819	$207.50	-$169,942
RAMIL YALDAEI	Mar 04	Tax Payment (F) Tax Payment	18,436	-615	$207.50	-$127,612
Yoon Ah OH	Mar 04	Tax Payment (F) Tax Payment	21,640	-417	$207.50	-$86,527
Michael P Plisinski	Mar 04	Tax Payment (F) Tax Payment	179,242	-3,742	$207.50	-$776,465

March 02, 2026

BRIAN K ROBERTS

Grant/Award Acquisition

Change: +3,096

Price: $0.00

Shares: 24,271

Value: +$0

Shirley Chen

Grant/Award Acquisition

Change: +2,523

Price: $0.00

Shares: 15,517

Value: +$0

Ido Dolev

Grant/Award Acquisition

Change: +3,440

Price: $0.00

Shares: 27,355

Value: +$0

RAMIL YALDAEI

Grant/Award Acquisition

Change: +7,683

Price: $0.00

Shares: 19,051

Value: +$0

Yoon Ah OH

Grant/Award Acquisition

Change: +2,408

Price: $0.00

Shares: 22,057

Value: +$0

Michael P Plisinski

Grant/Award Acquisition

Change: +14,479

Price: $0.00

Shares: 182,984

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
BRIAN K ROBERTS	Mar 04	Grant/Award Acquisition (A) Compensation/Award	24,271	+3,096	$0.00	+$0
Shirley Chen	Mar 04	Grant/Award Acquisition (A) Compensation/Award	15,517	+2,523	$0.00	+$0
Ido Dolev	Mar 04	Grant/Award Acquisition (A) Compensation/Award	27,355	+3,440	$0.00	+$0
RAMIL YALDAEI	Mar 04	Grant/Award Acquisition (A) Compensation/Award	19,051	+7,683	$0.00	+$0
Yoon Ah OH	Mar 04	Grant/Award Acquisition (A) Compensation/Award	22,057	+2,408	$0.00	+$0
Michael P Plisinski	Mar 04	Grant/Award Acquisition (A) Compensation/Award	182,984	+14,479	$0.00	+$0

March 01, 2026

Michael P Plisinski

Tax Payment

Change: -2,222

Price: $215.89

Shares: 170,430

Value: -$479,707

Michael P Plisinski

Option Exercise/Conversion

Change: +4,597

Price: $0.00

Shares: 172,652

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Michael P Plisinski	Mar 03	Tax Payment (F) Tax Payment	170,430	-2,222	$215.89	-$479,707
Michael P Plisinski	Mar 03	Option Exercise/Conversion (M) Compensation/Award	172,652	+4,597	$0.00	+$0