Tapewire

Nasdaq · USD

MKSI

MKS INC

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Tapewire entity
110
SEC CIK
0001049502
Parsed reports
467

Last 12 months

Inside the activity.

0 purchase rows · 45 sale rows

Disclosed non-derivative P/S rows, by transaction month. Includes amendments and private transactions.
Monthly counts
MonthPurchasesSales
Nov 202500
Dec 202501
Jan 202600
Feb 2026015
Mar 202603
Apr 202600
May 2026016
Jun 202607
Jul 202600
Aug 202602
Sep 202601
Oct 202600

Latest available

Insider transactions

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateOwner / reported roleActivity / securityShares / unitsReported priceReported valueDetails
September 01, 2026 Filed Sep 2, 2026 16:34 UTC SaleCommon Stock 300 $250.96 $75,288.00
Disclosure

SEC source: 0001049502-26-000119 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 18,845.353

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 23, 2026.

Read SEC document
August 17, 2026 Filed Aug 18, 2026 18:07 UTC
Donlan Renee MartelEVP, GC & CCO
GrantRestricted Stock Unit · Derivative 954.044 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000115 · form4.xml · derivative · entry 1

Donlan Renee Martel · CIK 0002135522 · EVP, GC & CCO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,780.571

Underlying: Common Stock · 954.044 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F2 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on August 17, 2027, provided that if, in any vesting year, August 17th is not a business day, such vesting shall occur on the next business day.

F2 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on August 17, 2027, provided that if, in any vesting year, August 17th is not a business day, such vesting shall occur on the next business day.

Read SEC document
August 14, 2026 Filed Aug 17, 2026 14:11 UTC
Lee John Tseng-ChungDirector · President & CEO
SaleCommon Stock 10,000 $302.01 $3,020,100.00
Disclosure

SEC source: 0001049502-26-000113 · form4.xml · nonDerivative · entry 1

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 134,776.2667

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2026.

Read SEC document
August 03, 2026 Filed Aug 4, 2026 16:21 UTC SaleCommon Stock 457 $288.31 $131,757.67
Disclosure

SEC source: 0001049502-26-000111 · form4.xml · nonDerivative · entry 1

Williams John Edward · CIK 0001710173 · EVP & GM, PSD

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 4,097.844

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026.

Read SEC document
June 12, 2026 Filed Jun 16, 2026 21:35 UTC SaleCommon Stock 217 $347.00 $75,299.00
Disclosure

SEC source: 0001049502-26-000109 · form4.xml · nonDerivative · entry 3

Schreiner James Alan · CIK 0001797189 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,201.121

Read SEC document
June 12, 2026 Filed Jun 16, 2026 21:35 UTC SaleCommon Stock 812 $346.41 $281,281.51
Disclosure

SEC source: 0001049502-26-000109 · form4.xml · nonDerivative · entry 2

Schreiner James Alan · CIK 0001797189 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,418.121

F2 · price: This transaction was executed in multiple trades at prices ranging from $346.000 to $346.795. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
June 12, 2026 Filed Jun 16, 2026 21:35 UTC SaleCommon Stock 2,471 $345.52 $853,789.56
Disclosure

SEC source: 0001049502-26-000109 · form4.xml · nonDerivative · entry 1

Schreiner James Alan · CIK 0001797189 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,230.121

F1 · price: This transaction was executed in multiple trades at prices ranging from $345.000 to $345.935. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
June 10, 2026 Filed Jun 11, 2026 14:40 UTC SaleCommon Stock 781 $317.42 $247,905.02
Disclosure

SEC source: 0001049502-26-000107 · form4.xml · nonDerivative · entry 1

Schreiner James Alan · CIK 0001797189 · EVP & COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,701.121

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 10, 2026.

Read SEC document
June 05, 2026 Filed Jun 8, 2026 14:53 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
SaleCommon Stock 2,434 $315.23 $767,269.82
Disclosure

SEC source: 0001049502-26-000105 · form4.xml · nonDerivative · entry 1

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1.549

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026.

Read SEC document
June 01, 2026 Filed Jun 2, 2026 19:08 UTC SaleCommon Stock 300 $318.02 $95,406.00
Disclosure

SEC source: 0001049502-26-000098 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 19,145.353

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 23, 2026.

Read SEC document
June 01, 2026 Filed Jun 2, 2026 19:13 UTC
Henry David PhilipEVP, Global Str Mktg & GM, MSD
SaleCommon Stock 6,000 $314.43 $1,886,583.00
Disclosure

SEC source: 0001049502-26-000100 · form4.xml · nonDerivative · entry 1

Henry David Philip · CIK 0001842459 · EVP, Global Str Mktg & GM, MSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,421.527

F1 · price: This transaction was executed in multiple trades at prices ranging from $314.2425 to $314.955. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:07 UTC SaleCommon Stock 2,100 $327.95 $688,703.40
Disclosure

SEC source: 0001049502-26-000096 · form4.xml · nonDerivative · entry 1

Donahue Joseph B · CIK 0001413323 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,032.704

F1 · price: This transaction was executed in multiple trades at prices ranging from $327.90 to $328.21. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:04 UTC SaleCommon Stock 2,800 $338.58 $948,024.00
Disclosure

SEC source: 0001049502-26-000094 · form4.xml · nonDerivative · entry 7

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 20,017

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:04 UTC SaleCommon Stock 213 $337.05 $71,791.76
Disclosure

SEC source: 0001049502-26-000094 · form4.xml · nonDerivative · entry 6

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 22,817

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

F7 · price: This transaction was executed in multiple trades at prices ranging from $337.00 to $337.73. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:04 UTC SaleCommon Stock 1,626 $336.54 $547,218.76
Disclosure

SEC source: 0001049502-26-000094 · form4.xml · nonDerivative · entry 5

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 23,030

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

F6 · price: his transaction was executed in multiple trades at prices ranging from $335.82 to $336.82. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:04 UTC SaleCommon Stock 1,811 $335.46 $607,514.44
Disclosure

SEC source: 0001049502-26-000094 · form4.xml · nonDerivative · entry 4

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 24,656

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

F5 · price: This transaction was executed in multiple trades at prices ranging from $334.60 to $335.55. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:04 UTC SaleCommon Stock 4,876 $332.04 $1,619,033.87
Disclosure

SEC source: 0001049502-26-000094 · form4.xml · nonDerivative · entry 3

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 26,467

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

F4 · price: This transaction was executed in multiple trades at prices ranging from $331.98 to $332.44. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:04 UTC SaleCommon Stock 8,210 $331.45 $2,721,194.65
Disclosure

SEC source: 0001049502-26-000094 · form4.xml · nonDerivative · entry 2

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 31,343

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

F3 · price: This transaction was executed in multiple trades at prices ranging from $330.95 to $331.90. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 27, 2026 Filed May 28, 2026 18:04 UTC SaleCommon Stock 464 $330.38 $153,297.62
Disclosure

SEC source: 0001049502-26-000094 · form4.xml · nonDerivative · entry 1

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 39,553

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

F2 · price: This transaction was executed in multiple trades at prices ranging from $329.90 to $330.90. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 26, 2026 Filed May 27, 2026 21:07 UTC
Henry David PhilipEVP, Global Str Mktg & GM, MSD
SaleCommon Stock 2,500 $330.50 $826,250.00
Disclosure

SEC source: 0001049502-26-000092 · form4.xml · nonDerivative · entry 1

Henry David Philip · CIK 0001842459 · EVP, Global Str Mktg & GM, MSD

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,341.368

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 24, 2026.

Read SEC document
May 22, 2026 Filed May 26, 2026 18:18 UTC SaleCommon Stock 8,810 $315.48 $2,779,378.80
Disclosure

SEC source: 0001049502-26-000090 · form4.xml · nonDerivative · entry 1

Mayampurath Ramakumar · CIK 0001859332 · EVP & CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1.139

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2026.

Read SEC document
May 22, 2026 Filed May 26, 2026 18:15 UTC
Lee John Tseng-ChungDirector · President & CEO
SaleCommon Stock 10,000 $315.48 $3,154,800.00
Disclosure

SEC source: 0001049502-26-000088 · form4.xml · nonDerivative · entry 1

Lee John Tseng-Chung · CIK 0001414656 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 144,696.1077

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2026.

Read SEC document
May 18, 2026 Filed May 19, 2026 14:46 UTC SaleCommon Stock 1,350 $303.40 $409,590.14
Disclosure

SEC source: 0001049502-26-000086 · form4.xml · nonDerivative · entry 1

CANNONE PETER III · CIK 0001276985 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,794.039

Read SEC document
May 14, 2026 Filed May 15, 2026 14:04 UTC SaleCommon Stock 1,000 $312.20 $312,196.90
Disclosure

SEC source: 0001049502-26-000084 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,775.156

Read SEC document
May 13, 2026 Filed May 14, 2026 15:12 UTC SaleCommon Stock 1,400 $318.99 $446,586.00
Disclosure

SEC source: 0001049502-26-000082 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,775.156

Read SEC document
May 11, 2026 Filed May 12, 2026 19:19 UTC
Taranto Eric RobertEVP & GM, VSD
SaleCommon Stock 2,848.522 $319.93 $911,327.64
Disclosure

SEC source: 0001049502-26-000080 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,596.2394

F1 · price: This transaction was executed in multiple trades at prices ranging from $319.930 to $320.345. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 11, 2026 Filed May 12, 2026 19:17 UTC GrantCommon Stock 781.959 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000078 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,175.156

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
May 11, 2026 Filed May 12, 2026 19:15 UTC GrantCommon Stock 781.959 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000076 · form4.xml · nonDerivative · entry 1

JABRE WISSAM G · CIK 0001903967 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,269.935

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
May 11, 2026 Filed May 12, 2026 19:13 UTC GrantCommon Stock 781.959 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000074 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,445.353

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
May 11, 2026 Filed May 12, 2026 19:09 UTC
Burke Kathleen FlahertyEVP, GC & Secretary
SaleCommon Stock 4,355 $319.94 $1,393,316.93
Disclosure

SEC source: 0001049502-26-000072 · form4.xml · nonDerivative · entry 1

Burke Kathleen Flaherty · CIK 0001775435 · EVP, GC & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,439.485

F1 · price: This transaction was executed in multiple trades at prices ranging from $319.715 to $320.670. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 11, 2026 Filed May 12, 2026 19:07 UTC GrantCommon Stock 781.959 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000070 · form4.xml · nonDerivative · entry 1

Donahue Joseph B · CIK 0001413323 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,132.704

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
May 11, 2026 Filed May 12, 2026 19:04 UTC GrantCommon Stock 781.959 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000068 · form4.xml · nonDerivative · entry 1

CANNONE PETER III · CIK 0001276985 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,144.039

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
May 11, 2026 Filed May 12, 2026 19:02 UTC
Batra RajDirector
GrantCommon Stock 781.959 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000066 · form4.xml · nonDerivative · entry 1

Batra Raj · CIK 0001754514 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,227.298

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
May 11, 2026 Filed May 12, 2026 18:59 UTC GrantCommon Stock 781.959 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000064 · form4.xml · nonDerivative · entry 1

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,998.886

F1 · kind: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2 · price: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
April 17, 2026 Filed Apr 20, 2026 15:31 UTC Exercise / conversionRestricted Stock Unit · Derivative 1,740.714 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000061 · form4.xml · derivative · entry 3

Williams John Edward · CIK 0001710173 · EVP & GM, PSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,812.003

Underlying: Common Stock · 1,740.714 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F3 · derivative.exercise_date: These RSUs vest in two equal annual installments commencing on April 17, 2025, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in two equal annual installments commencing on April 17, 2025, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

Read SEC document
April 17, 2026 Filed Apr 20, 2026 15:31 UTC Tax withholdingCommon Stock 825.969 $269.89 $222,920.77
Disclosure

SEC source: 0001049502-26-000061 · form4.xml · nonDerivative · entry 2

Williams John Edward · CIK 0001710173 · EVP & GM, PSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,554.844

F2 · kind: These shares were withheld by MKS Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

Read SEC document
April 17, 2026 Filed Apr 20, 2026 15:31 UTC Exercise / conversionCommon Stock 1,740.714 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000061 · form4.xml · nonDerivative · entry 1

Williams John Edward · CIK 0001710173 · EVP & GM, PSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,380.813

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
Exercise / conversionRestricted Stock Unit · Derivative 1,736 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · derivative · entry 8

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,388.16

Underlying: Common Stock · 1,736 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F5 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on April 15, 2026, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

F5 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on April 15, 2026, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

Read SEC document
April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
Exercise / conversionRestricted Stock Unit · Derivative 1,107 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · derivative · entry 7

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,124.16

Underlying: Common Stock · 1,107 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F4 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on April 15, 2025, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

F4 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on April 15, 2025, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

Read SEC document
April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
Exercise / conversionRestricted Stock Unit · Derivative 968 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · derivative · entry 6

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,231.16

Underlying: Common Stock · 968 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F4 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on April 15, 2025, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

F4 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on April 15, 2025, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

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April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
GrantRestricted Stock Unit · Derivative 1,672.862 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · derivative · entry 5

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,199.16

Underlying: Common Stock · 1,672.862 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

F3 · derivative.exercise_date: These RSUs vest in three equal annual installments commencing on April 15, 2027, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

F3 · derivative.expiration_date: These RSUs vest in three equal annual installments commencing on April 15, 2027, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.

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April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
Tax withholdingCommon Stock 1,375.451 $274.15 $377,079.89
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · nonDerivative · entry 4

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,435.549

F2 · kind: These shares were withheld by MKS Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

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April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
Exercise / conversionCommon Stock 1,736 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · nonDerivative · entry 3

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,811

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
Exercise / conversionCommon Stock 1,107 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · nonDerivative · entry 2

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,075

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

Read SEC document
April 15, 2026 Filed Apr 16, 2026 19:29 UTC
McCarthy Michelle MSVP & Chief Accounting Officer
Exercise / conversionCommon Stock 968 Not disclosed Not disclosed
Disclosure

SEC source: 0001049502-26-000059 · form4.xml · nonDerivative · entry 1

McCarthy Michelle M · CIK 0001732461 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 968

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

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March 12, 2026 Filed Mar 13, 2026 14:19 UTC SaleCommon Stock 340.107 $213.77 $72,705.25
Disclosure

SEC source: 0001049502-26-000057 · form4.xml · nonDerivative · entry 1

Moloney Jacqueline F · CIK 0001501968 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,393.197

F1 · price: This transaction was executed in multiple trades at prices ranging from $213.7716 to $214.015. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

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March 06, 2026 Filed Mar 9, 2026 16:01 UTC
Taranto Eric RobertEVP & GM, VSD
SaleCommon Stock 4,567.879 $220.52 $1,007,317.81
Disclosure

SEC source: 0001049502-26-000055 · form4.xml · nonDerivative · entry 1

Taranto Eric Robert · CIK 0001842235 · EVP & GM, VSD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,444.7614

F1 · price: This transaction was executed in multiple trades at prices ranging from $220.3701 to $220.780. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

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March 02, 2026 Filed Mar 3, 2026 17:18 UTC SaleCommon Stock 300 $239.44 $71,832.00
Disclosure

SEC source: 0001049502-26-000053 · form4.xml · nonDerivative · entry 1

Mora Elizabeth · CIK 0001548935 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 18,663.394

F1 · kind: This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 19, 2025.

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February 24, 2026 Filed Feb 24, 2026 19:26 UTC SaleCommon Stock 10,000 $253.97 $2,539,675.00
Disclosure

SEC source: 0001049502-26-000049 · form4.xml · nonDerivative · entry 2

COLELLA GERALD G · CIK 0001256715 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By The Gerald G. Colella 2019 Trust

Disclosed balance after: 40,017

F2 · price: This transaction was executed in multiple trades at prices ranging from $253.470 to $255.250. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

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February 24, 2026 Filed Feb 25, 2026 16:50 UTC SaleCommon Stock 4,100 $255.00 $1,045,500.00
Disclosure

SEC source: 0001049502-26-000051 · form4.xml · nonDerivative · entry 1

Schreiner James Alan · CIK 0001797189 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,401.962

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.