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$MKSI

$320.55 -$14.60 (4.36%)

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Insider Transactions

Insider Transaction Summary

IV Participations, S.a r.l. SICAR CEP

6,482,732 shares

Net: 0 B/S: -

Holdings II L.L.C. Carlyle

6,482,732 shares

Net: 0 B/S: -

John Tseng-Chung Lee

171,386 shares

Net: +41,144 B/S: 6.69

JOHN R BERTUCCI

67,275 shares

Net: 0 B/S: -

Kathleen Flaherty Burke

53,794 shares

Net: +3,597 B/S: 3.28

GERALD G COLELLA

40,017 shares

Net: -20,000 B/S: -

Cristina Amon

29,283 shares

Net: 0 B/S: -

James Alan Schreiner

23,402 shares

Net: +1,943 B/S: 2.14

David Philip Henry

18,841 shares

Net: -2,602 B/S: 1.17

Elizabeth Mora

18,663 shares

Net: -900 B/S: -

Mark Milton Gitin

17,954 shares

Net: 0 B/S: -

Brian Charles Quirk

17,641 shares

Net: 0 B/S: -

Raj Batra

15,445 shares

Net: 0 B/S: -

Eric Robert Taranto

15,445 shares

Net: -1,706 B/S: 1.17

SETH H BAGSHAW

12,613 shares

Net: 0 B/S: -

Joseph B Donahue

11,351 shares

Net: 0 B/S: -

Michelle M Warner

10,852 shares

Net: 0 B/S: -

Jacqueline F Moloney

10,393 shares

Net: -1,769 B/S: -

ROBERT R ANDERSON

9,296 shares

Net: 0 B/S: -

Ramakumar Mayampurath

8,625 shares

Net: +19,266 B/S: ∞

PETER III CANNONE

8,362 shares

Net: -1,250 B/S: -

GERARD G COLELLA

8,217 shares

Net: 0 B/S: -

ROBERT J PHILLIPPY

7,355 shares

Net: 0 B/S: -

John R Abrams

6,864 shares

Net: 0 B/S: -

RICHARD S CHUTE

6,616 shares

Net: 0 B/S: -

Rick D Hess

5,468 shares

Net: 0 B/S: -

John Edward Williams

5,381 shares

Net: +3,063 B/S: 3.64

WISSAM G JABRE

4,488 shares

Net: 0 B/S: -

JANICE K HENRY

1,989 shares

Net: 0 B/S: -

Gregory R Beecher

1,981 shares

Net: 0 B/S: -

GEOFFREY WILD

1,813 shares

Net: 0 B/S: -

PETER HANLEY

1,501 shares

Net: 0 B/S: -

Dennis L Werth

1,244 shares

Net: 0 B/S: -

Michelle M McCarthy

968 shares

Net: +616 B/S: 4.06

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
IV Participations, S.a r.l. SICAR CEP	6,482,732	0	-
Holdings II L.L.C. Carlyle	6,482,732	0	-
John Tseng-Chung Lee	171,386	+41,144	6.69
JOHN R BERTUCCI	67,275	0	-
Kathleen Flaherty Burke	53,794	+3,597	3.28
GERALD G COLELLA	40,017	-20,000	-
Cristina Amon	29,283	0	-
James Alan Schreiner	23,402	+1,943	2.14
David Philip Henry	18,841	-2,602	1.17
Elizabeth Mora	18,663	-900	-
Mark Milton Gitin	17,954	0	-
Brian Charles Quirk	17,641	0	-
Raj Batra	15,445	0	-
Eric Robert Taranto	15,445	-1,706	1.17
SETH H BAGSHAW	12,613	0	-
Joseph B Donahue	11,351	0	-
Michelle M Warner	10,852	0	-
Jacqueline F Moloney	10,393	-1,769	-
ROBERT R ANDERSON	9,296	0	-
Ramakumar Mayampurath	8,625	+19,266	∞
PETER III CANNONE	8,362	-1,250	-
GERARD G COLELLA	8,217	0	-
ROBERT J PHILLIPPY	7,355	0	-
John R Abrams	6,864	0	-
RICHARD S CHUTE	6,616	0	-
Rick D Hess	5,468	0	-
John Edward Williams	5,381	+3,063	3.64
WISSAM G JABRE	4,488	0	-
JANICE K HENRY	1,989	0	-
Gregory R Beecher	1,981	0	-
GEOFFREY WILD	1,813	0	-
PETER HANLEY	1,501	0	-
Dennis L Werth	1,244	0	-
Michelle M McCarthy	968	+616	4.06

Individual Transactions

April 17, 2026

John Edward Williams

Tax Payment

Change: -826

Price: $269.89

Shares: 4,555

Value: -$222,929

John Edward Williams

Option Exercise/Conversion

Change: +1,741

Price: $0.00

Shares: 5,381

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
John Edward Williams	Apr 20	Tax Payment (F) Tax Payment	4,555	-826	$269.89	-$222,929
John Edward Williams	Apr 20	Option Exercise/Conversion (M) Compensation/Award	5,381	+1,741	$0.00	+$0

April 15, 2026

Michelle M McCarthy

Tax Payment

Change: -1,375

Price: $274.15

Shares: 2,436

Value: -$376,956

Michelle M McCarthy

Grant/Award Acquisition

Change: +1,673

Price: $0.00

Shares: 11,199

Value: +$0

Michelle M McCarthy

Option Exercise/Conversion

Change: +968

Price: $0.00

Shares: 968

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Michelle M McCarthy	Apr 16	Tax Payment (F) Tax Payment	2,436	-1,375	$274.15	-$376,956
Michelle M McCarthy	Apr 16	Grant/Award Acquisition (A) Compensation/Award	11,199	+1,673	$0.00	+$0
Michelle M McCarthy	Apr 16	Option Exercise/Conversion (M) Compensation/Award	968	+968	$0.00	+$0

March 12, 2026

Jacqueline F Moloney

Open Market Sale

Change: -340

Price: $213.77

Shares: 10,393

Value: -$72,682

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Jacqueline F Moloney	Mar 13	Open Market Sale (S) Market Sale	10,393	-340	$213.77	-$72,682

March 06, 2026

Eric Robert Taranto

Open Market Sale

Change: -4,568

Price: $220.52

Shares: 15,445

Value: -$1,007,344

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Eric Robert Taranto	Mar 09	Open Market Sale (S) Market Sale	15,445	-4,568	$220.52	-$1,007,344

March 02, 2026

Elizabeth Mora

Open Market Sale

Change: -300

Price: $239.44

Shares: 18,663

Value: -$71,832

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Elizabeth Mora	Mar 03	Open Market Sale (S) Market Sale	18,663	-300	$239.44	-$71,832

February 24, 2026

GERALD G COLELLA

Open Market Sale

Change: -10,000

Price: $253.97

Shares: 40,017

Value: -$2,539,675

James Alan Schreiner

Open Market Sale

Change: -4,100

Price: $255.00

Shares: 23,402

Value: -$1,045,500

Insider	Filing Date	Transaction	Shares	Change	Price	Value
GERALD G COLELLA	Feb 24	Open Market Sale (S) Market Sale	40,017	-10,000	$253.97	-$2,539,675
James Alan Schreiner	Feb 25	Open Market Sale (S) Market Sale	23,402	-4,100	$255.00	-$1,045,500

February 20, 2026

GERALD G COLELLA

Open Market Sale

Change: -10,000

Price: $252.90

Shares: 50,017

Value: -$2,528,999

PETER III CANNONE

Open Market Sale

Change: -1,250

Price: $258.06

Shares: 8,362

Value: -$322,574

Eric Robert Taranto

Open Market Sale

Change: -1,453

Price: $247.55

Shares: 20,013

Value: -$359,690

David Philip Henry

Open Market Sale

Change: -2,000

Price: $261.56

Shares: 18,841

Value: -$523,120

Michelle M McCarthy

Open Market Sale

Change: -650

Price: $249.57

Shares: 816

Value: -$162,218

Jacqueline F Moloney

Open Market Sale

Change: -829

Price: $247.55

Shares: 10,733

Value: -$205,218

John Edward Williams

Open Market Sale

Change: -2,043

Price: $256.41

Shares: 3,640

Value: -$523,840

Kathleen Flaherty Burke

Open Market Sale

Change: -4,254

Price: $250.00

Shares: 53,794

Value: -$1,063,500

John Tseng-Chung Lee

Open Market Sale

Change: -13,310

Price: $256.05

Shares: 171,386

Value: -$3,408,076

Insider	Filing Date	Transaction	Shares	Change	Price	Value
GERALD G COLELLA	Feb 24	Open Market Sale (S) Market Sale	50,017	-10,000	$252.90	-$2,528,999
PETER III CANNONE	Feb 23	Open Market Sale (S) Market Sale	8,362	-1,250	$258.06	-$322,574
Eric Robert Taranto	Feb 23	Open Market Sale (S) Market Sale	20,013	-1,453	$247.55	-$359,690
David Philip Henry	Feb 23	Open Market Sale (S) Market Sale	18,841	-2,000	$261.56	-$523,120
Michelle M McCarthy	Feb 23	Open Market Sale (S) Market Sale	816	-650	$249.57	-$162,218
Jacqueline F Moloney	Feb 23	Open Market Sale (S) Market Sale	10,733	-829	$247.55	-$205,218
John Edward Williams	Feb 23	Open Market Sale (S) Market Sale	3,640	-2,043	$256.41	-$523,840
Kathleen Flaherty Burke	Feb 23	Open Market Sale (S) Market Sale	53,794	-4,254	$250.00	-$1,063,500
John Tseng-Chung Lee	Feb 23	Open Market Sale (S) Market Sale	171,386	-13,310	$256.05	-$3,408,076

February 17, 2026

Kathleen Flaherty Burke

Tax Payment

Change: -5,318

Price: $260.74

Shares: 58,048

Value: -$1,386,615

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Kathleen Flaherty Burke	Feb 18	Tax Payment (F) Tax Payment	58,048	-5,318	$260.74	-$1,386,615