MCCARTHY MICHELLE M (VP & Chief Accounting Officer) exercised options at MKS INC

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 3 exercises

MCCARTHY MICHELLE M

Filed: 4/16/2026ACC: 0001049502-26-000059

InsiderMCCARTHY MICHELLE MCIK 1732461

→

IssuerMKS INCCIK 1049502

Officer· VP & Chief Accounting Officer

Since Feb 2026

+297.41

Net shares

Net buyer

$377.1K

Total sold

Open market trades

0B · 0S

Total transactions

5.48K acquired · 5.19K disposed

Non-Derivative Transactions4

Common Stock

Direct

M · Option Exercise

+968.00

Price / share

—

Trade value

—

% of position

New position

4/15/2026

0.00→968.00

Common Stock

Direct

M · Option Exercise

+1.11K

Price / share

—

Trade value

—

% of position

114.4%

4/15/2026

968.00→2.08K

Common Stock

Direct

M · Option Exercise

+1.74K

Price / share

—

Trade value

—

% of position

83.7%

4/15/2026

2.08K→3.81K

Common Stock

Direct

F · Tax Withholding

−1.38K

Price / share

$274.15

Trade value

$377.08K

% of position

36.1%

4/15/2026

3.81K→2.44K

Total

Net shares

+2.44K

Net value

-$377.08K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	4/15/2026	M · Option Exercise	+968.00	—	—	New position	0.00	968.00
Common Stock Direct	4/15/2026	M · Option Exercise	+1.11K	—	—	114.4%	968.00	2.08K
Common Stock Direct	4/15/2026	M · Option Exercise	+1.74K	—	—	83.7%	2.08K	3.81K
Common Stock Direct	4/15/2026	F · Tax Withholding	−1.38K	$274.15	$377.08K	36.1%	3.81K	2.44K
Total			+2.44K		-$377.08K

Derivative Transactions4

Restricted Stock Unit

Direct

A · Award

Converts to

Common Stock

1.67K shares

+1.67K

Strike price

Held after

11.20K

Exercisable

—

4/15/2026

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

968.00 shares

−968.00

Strike price

Held after

10.23K

Exercisable

—

4/15/2026

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

1.11K shares

−1.11K

Strike price

Held after

9.12K

Exercisable

—

4/15/2026

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

1.74K shares

−1.74K

Strike price

Held after

7.39K

Exercisable

—

4/15/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Unit Direct	Common Stock1.67K shares	4/15/2026	A · Award	+1.67K	—	11.20K
Restricted Stock Unit Direct	Common Stock968.00 shares	4/15/2026	M · Option Exercise	−968.00	—	10.23K
Restricted Stock Unit Direct	Common Stock1.11K shares	4/15/2026	M · Option Exercise	−1.11K	—	9.12K
Restricted Stock Unit Direct	Common Stock1.74K shares	4/15/2026	M · Option Exercise	−1.74K	—	7.39K