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$ONTO

$270.60 -$7.42 (2.67%)

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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

37,752 shares

Net: 0 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

21,640 shares

Net: +4,398 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

18,436 shares

Net: +6,776 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

11,931 shares

Net: 0 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

7,223 shares

Net: 0 B/S: -

Stephen Douglas Kelley

5,623 shares

Net: 0 B/S: -

KAREN M ROGGE

5,150 shares

Net: 0 B/S: -

BARRY HARTUNIAN

3,058 shares

Net: 0 B/S: -

D MAYSON BROOKS

3,025 shares

Net: 0 B/S: -

Susan D Lynch

2,923 shares

Net: 0 B/S: -

STEPHEN S SCHWARTZ

2,775 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	37,752	0	-
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	21,640	+4,398	∞
LEO BERLINGHIERI	20,210	0	-
Srinivas Vedula	18,730	0	-
JOHN R WHITTEN	18,618	0	-
RAMIL YALDAEI	18,436	+6,776	∞
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	11,931	0	-
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	7,223	0	-
Stephen Douglas Kelley	5,623	0	-
KAREN M ROGGE	5,150	0	-
BARRY HARTUNIAN	3,058	0	-
D MAYSON BROOKS	3,025	0	-
Susan D Lynch	2,923	0	-
STEPHEN S SCHWARTZ	2,775	0	-
Leonard A LaBua	1,473	0	-
George C Murray	878	0	-
Michael Sheaffer	514	0	-

Individual Transactions

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

Yoon Ah OH

Tax Payment

Change: -307

Price: $215.89

Shares: 19,916

Value: -$66,278

Yoon Ah OH

Option Exercise/Conversion

Change: +724

Price: $0.00

Shares: 20,223

Value: +$0

RAMIL YALDAEI

Tax Payment

Change: -347

Price: $215.89

Shares: 11,644

Value: -$74,913

RAMIL YALDAEI

Option Exercise/Conversion

Change: +649

Price: $0.00

Shares: 11,991

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
Yoon Ah OH	Mar 03	Tax Payment (F) Tax Payment	19,916	-307	$215.89	-$66,278
Yoon Ah OH	Mar 03	Option Exercise/Conversion (M) Compensation/Award	20,223	+724	$0.00	+$0
RAMIL YALDAEI	Mar 03	Tax Payment (F) Tax Payment	11,644	-347	$215.89	-$74,913
RAMIL YALDAEI	Mar 03	Option Exercise/Conversion (M) Compensation/Award	11,991	+649	$0.00	+$0

February 14, 2026

Yoon Ah OH

Tax Payment

Change: -1,094

Price: $217.23

Shares: 20,000

Value: -$237,649

Yoon Ah OH

Option Exercise/Conversion

Change: +3,084

Price: $0.00

Shares: 21,094

Value: +$0

Michael P Plisinski

Option Exercise/Conversion

Change: +18,445

Price: $0.00

Shares: 180,606

Value: +$0

Michael P Plisinski

Tax Payment

Change: -8,919

Price: $217.23

Shares: 171,687

Value: -$1,937,474

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Yoon Ah OH	Feb 18	Tax Payment (F) Tax Payment	20,000	-1,094	$217.23	-$237,649
Yoon Ah OH	Feb 18	Option Exercise/Conversion (M) Compensation/Award	21,094	+3,084	$0.00	+$0
Michael P Plisinski	Feb 18	Option Exercise/Conversion (M) Compensation/Award	180,606	+18,445	$0.00	+$0
Michael P Plisinski	Feb 18	Tax Payment (F) Tax Payment	171,687	-8,919	$217.23	-$1,937,474