The Filings Report

MKS Inc. Common Stock insider trading

MKSIfinancial statementsForm 4 filings on EDGAR186 transactions since Nov 1, 2024

From August 4, 2026 to November 1, 2026, 0 insiders at MKS Inc. Common Stock bought $0 of stock in the open market, and 2 sold $3M. Officers and directors accounted for $0 of purchases and $3M of sales. The last reported transaction was an open-market sale by Mora Elizabeth on September 1, 2026.

The answer card and chart use the same period. Change the range above the chart to update both. Form 4 filings through September 2, 2026; awards, option exercises, tax withholding and gifts are excluded from these totals.

Stock price and insider activity

Daily price candles with insider purchases and sales directly beneath them on the same timeline. Bars show individual days; totals sum all days in the selected period.

MKSI daily priceSplit-adjusted prices in US dollars

Bought $0Sold $3MAug 4, 2026 – Nov 1, 2026

Oct 30, 2026O $200.99 · H $206.85 · L $196.20 · C $202.04Bought $0 (0)Sold $0 (0)
$184$222$261$299$3382026-08-04: open $327.27, high $329.34, low $320.45, close $320.762026-08-05: open $319.23, high $329.35, low $311.86, close $313.102026-08-06: open $291.02, high $309.67, low $285.58, close $291.312026-08-07: open $301.18, high $310.43, low $298.00, close $304.992026-08-10: open $304.92, high $309.84, low $292.09, close $292.352026-08-11: open $299.03, high $300.72, low $290.76, close $294.382026-08-12: open $312.90, high $317.00, low $305.55, close $306.832026-08-13: open $306.99, high $316.39, low $305.56, close $306.292026-08-14: open $302.01, high $312.08, low $302.01, close $310.732026-08-17: open $315.42, high $325.24, low $313.11, close $320.742026-08-18: open $303.87, high $309.14, low $294.68, close $300.242026-08-19: open $304.16, high $304.16, low $278.23, close $281.602026-08-20: open $280.91, high $284.54, low $274.31, close $281.882026-08-21: open $282.60, high $285.47, low $274.88, close $279.112026-08-24: open $271.50, high $274.00, low $264.54, close $269.062026-08-25: open $274.93, high $274.93, low $266.25, close $270.482026-08-26: open $270.12, high $275.17, low $266.52, close $271.752026-08-27: open $279.03, high $282.56, low $268.44, close $270.992026-08-28: open $268.08, high $269.36, low $255.14, close $255.762026-08-31: open $258.38, high $259.38, low $254.48, close $256.242026-09-01: open $250.96, high $252.09, low $243.72, close $246.442026-09-02: open $247.30, high $252.98, low $245.90, close $251.382026-09-03: open $247.10, high $250.78, low $241.51, close $249.652026-09-04: open $255.14, high $260.94, low $253.97, close $260.312026-09-08: open $264.06, high $270.17, low $260.35, close $265.502026-09-09: open $262.34, high $269.78, low $262.34, close $268.052026-09-10: open $260.83, high $265.60, low $258.79, close $261.842026-09-11: open $267.86, high $270.29, low $264.74, close $267.312026-09-14: open $248.32, high $250.49, low $238.29, close $239.272026-09-15: open $242.60, high $242.60, low $228.46, close $231.502026-09-16: open $237.80, high $240.48, low $232.03, close $235.282026-09-17: open $245.50, high $250.84, low $238.45, close $240.232026-09-18: open $244.03, high $252.38, low $243.00, close $252.082026-09-21: open $258.20, high $259.00, low $251.79, close $256.922026-09-22: open $253.50, high $260.66, low $252.60, close $260.372026-09-23: open $260.37, high $263.78, low $253.41, close $262.722026-09-24: open $256.64, high $259.82, low $254.21, close $257.982026-09-25: open $261.01, high $262.66, low $257.90, close $260.822026-09-28: open $259.56, high $259.69, low $251.19, close $258.382026-09-29: open $264.18, high $266.28, low $261.36, close $266.022026-09-30: open $267.82, high $268.00, low $260.23, close $265.362026-10-01: open $265.57, high $275.48, low $262.77, close $271.242026-10-02: open $284.10, high $284.63, low $278.91, close $279.152026-10-05: open $279.79, high $284.21, low $273.60, close $280.502026-10-06: open $285.40, high $286.38, low $276.56, close $281.412026-10-07: open $271.72, high $274.99, low $269.11, close $273.152026-10-08: open $266.69, high $274.07, low $257.60, close $260.382026-10-09: open $266.09, high $267.96, low $256.65, close $264.502026-10-12: open $261.18, high $261.18, low $249.81, close $249.912026-10-13: open $242.35, high $249.52, low $238.14, close $247.562026-10-14: open $241.02, high $244.54, low $232.20, close $234.502026-10-15: open $224.32, high $230.57, low $212.35, close $228.522026-10-16: open $224.40, high $225.79, low $213.95, close $214.832026-10-19: open $221.51, high $223.49, low $215.09, close $215.412026-10-20: open $210.57, high $216.82, low $205.62, close $211.142026-10-21: open $220.69, high $220.69, low $213.19, close $216.102026-10-22: open $204.01, high $205.18, low $193.21, close $196.112026-10-23: open $193.99, high $200.19, low $192.01, close $196.552026-10-26: open $198.75, high $205.33, low $197.03, close $202.282026-10-27: open $206.78, high $212.71, low $204.09, close $212.162026-10-28: open $218.68, high $220.41, low $214.35, close $218.242026-10-29: open $216.67, high $222.30, low $214.50, close $216.172026-10-30: open $200.99, high $206.85, low $196.20, close $202.04Insider purchases / sales · USD$5M$0−$5M2026-08-14: 0 purchases ($0), 1 sales ($3M)2026-09-01: 0 purchases ($0), 1 sales ($75K)Aug 4Aug 26Sep 17Oct 9Oct 30

purchases above zero; sales below. Both use the transaction date and the same dollar scale. Hover, tap, or use arrow keys to inspect a date. Awards, exercises, tax withholding and gifts are excluded.

Dates with prices or insider activity are spaced evenly; empty weekends and holidays are omitted. Prices through Oct 30, 2026. Insider data through Nov 1, 2026. Prices are adjusted for splits; transaction values are reported dollars.

Every transaction

186 transactions from November 1, 2024 to November 1, 2026, newest first. Open-market purchases and sales are coloured; awards, exercises, tax withholding and gifts are grey and not counted.

TradedInsiderRoleTransactionSharesPriceValueHeld afterFiled
Sep 1, 2026Mora ElizabethDirectoropen-market sale10b5-1300$250.96$75K18,845Sep 2, 2026
Aug 14, 2026Lee John Tseng-ChungPresident & CEO, Directoropen-market sale10b5-110,000$302.01$3M134,776Aug 17, 2026
Aug 3, 2026Williams John EdwardEVP & GM, PSDopen-market sale10b5-1457$288.31$132K4,098Aug 4, 2026
Jun 12, 2026Schreiner James AlanEVP & COOopen-market sale2,471$345.52$854K20,230Jun 16, 2026
Jun 12, 2026Schreiner James AlanEVP & COOopen-market sale812$346.41$281K19,418Jun 16, 2026
Jun 12, 2026Schreiner James AlanEVP & COOopen-market sale217$347.00$75K19,201Jun 16, 2026
Jun 10, 2026Schreiner James AlanEVP & COOopen-market sale10b5-1781$317.42$248K22,701Jun 11, 2026
Jun 5, 2026McCarthy Michelle MSVP & Chief Accounting Officeropen-market sale10b5-12,434$315.23$767K2Jun 8, 2026
Jun 1, 2026Henry David PhilipEVP, Global Str Mktg & GM, MSDopen-market sale6,000$314.43$2M10,422Jun 2, 2026
Jun 1, 2026Mora ElizabethDirectoropen-market sale10b5-1300$318.02$95K19,145Jun 2, 2026
May 27, 2026Donahue Joseph BDirectoropen-market sale2,100$327.95$689K10,033May 28, 2026
May 27, 2026Colella Gerald GDirectoropen-market sale10b5-1indirect464$330.38$153K39,553May 28, 2026
May 27, 2026Colella Gerald GDirectoropen-market sale10b5-1indirect8,210$331.45$3M31,343May 28, 2026
May 27, 2026Colella Gerald GDirectoropen-market sale10b5-1indirect4,876$332.04$2M26,467May 28, 2026
May 27, 2026Colella Gerald GDirectoropen-market sale10b5-1indirect1,811$335.46$608K24,656May 28, 2026
May 27, 2026Colella Gerald GDirectoropen-market sale10b5-1indirect1,626$336.54$547K23,030May 28, 2026
May 27, 2026Colella Gerald GDirectoropen-market sale10b5-1indirect213$337.05$72K22,817May 28, 2026
May 27, 2026Colella Gerald GDirectoropen-market sale10b5-1indirect2,800$338.58$948K20,017May 28, 2026
May 26, 2026Henry David PhilipEVP, Global Str Mktg & GM, MSDopen-market sale10b5-12,500$330.50$826K16,341May 27, 2026
May 22, 2026Mayampurath RamakumarEVP & CFOopen-market sale10b5-18,810$315.48$3M1May 26, 2026
May 22, 2026Lee John Tseng-ChungPresident & CEO, Directoropen-market sale10b5-110,000$315.48$3M144,696May 26, 2026
May 18, 2026Cannone Peter IIIDirectoropen-market sale1,350$303.40$410K7,794May 19, 2026
May 14, 2026Moloney Jacqueline FDirectoropen-market sale1,000$312.20$312K8,775May 15, 2026
May 13, 2026Moloney Jacqueline FDirectoropen-market sale1,400$318.99$447K9,775May 14, 2026
May 11, 2026Taranto Eric RobertEVP & GM, VSDopen-market sale2,849$319.93$911K12,596May 12, 2026
May 11, 2026Moloney Jacqueline FDirectoraward782——11,175May 12, 2026
May 11, 2026Jabre Wissam GDirectoraward782——5,270May 12, 2026
May 11, 2026Mora ElizabethDirectoraward782——19,445May 12, 2026
May 11, 2026Burke Kathleen FlahertyEVP, GC & Secretaryopen-market sale4,355$319.94$1M49,439May 12, 2026
May 11, 2026Donahue Joseph BDirectoraward782——12,133May 12, 2026
May 11, 2026Cannone Peter IIIDirectoraward782——9,144May 12, 2026
May 11, 2026Batra RajDirectoraward782——16,227May 12, 2026
May 11, 2026Colella Gerald GDirectoraward782——8,999May 12, 2026
Apr 17, 2026Williams John EdwardEVP & GM, PSDoption exercise1,741——5,381Apr 20, 2026
Apr 17, 2026Williams John EdwardEVP & GM, PSDtax withholding826$269.89$223K4,555Apr 20, 2026
Apr 15, 2026McCarthy Michelle MSVP & Chief Accounting Officeroption exercise968——968Apr 16, 2026
Apr 15, 2026McCarthy Michelle MSVP & Chief Accounting Officeroption exercise1,107——2,075Apr 16, 2026
Apr 15, 2026McCarthy Michelle MSVP & Chief Accounting Officeroption exercise1,736——3,811Apr 16, 2026
Apr 15, 2026McCarthy Michelle MSVP & Chief Accounting Officertax withholding1,375$274.15$377K2,436Apr 16, 2026
Mar 12, 2026Moloney Jacqueline FDirectoropen-market sale340$213.77$73K10,393Mar 13, 2026
Mar 6, 2026Taranto Eric RobertEVP & GM, VSDopen-market sale4,568$220.52$1M15,445Mar 9, 2026
Mar 2, 2026Mora ElizabethDirectoropen-market sale10b5-1300$239.44$72K18,663Mar 3, 2026
Feb 24, 2026Schreiner James AlanEVP & COOopen-market sale4,100$255.00$1M23,402Feb 25, 2026
Feb 24, 2026Colella Gerald GDirectoropen-market saleindirect10,000$253.97$3M40,017Feb 24, 2026
Feb 20, 2026Colella Gerald GDirectoropen-market saleindirect10,000$252.90$3M50,017Feb 24, 2026
Feb 20, 2026Cannone Peter IIIDirectoropen-market sale1,250$258.06$323K8,362Feb 23, 2026
Feb 20, 2026Taranto Eric RobertEVP & GM, VSDopen-market sale1,453$247.55$360K20,013Feb 23, 2026
Feb 20, 2026Henry David PhilipEVP, Global Str Mktg & GM, MSDopen-market sale2,000$261.56$523K18,841Feb 23, 2026
Feb 20, 2026McCarthy Michelle MVP & Chief Accounting Officeropen-market sale816$250.35$204K0Feb 23, 2026
Feb 20, 2026McCarthy Michelle MVP & Chief Accounting Officeropen-market sale650$249.57$162K816Feb 23, 2026

Who the insiders are

Everyone who reported a transaction since November 1, 2024, by open-market value over twelve months. Shares held are after the insider’s latest directly held transaction.

InsiderRoleLast transactionKindShares heldBought, 12 monthsSold, 12 monthsSales under a plan
Lee John Tseng-ChungPresident & CEO, DirectorAug 14, 2026open-market sale134,776—$14M (6)2 of 6
Colella Gerald GDirectorMay 27, 2026open-market sale8,999—$12M (9)7 of 9
Henry David PhilipEVP, Global Str Mktg & GM, MSDJun 1, 2026open-market sale10,422—$3M (3)1 of 3
Mayampurath RamakumarEVP & CFOMay 22, 2026open-market sale1—$3M (1)1 of 1
Schreiner James AlanEVP & COOJun 12, 2026open-market sale20,230—$3M (5)1 of 5
Burke Kathleen FlahertyEVP, GC & SecretaryMay 11, 2026open-market sale49,439—$2M (2)0 of 2
Taranto Eric RobertEVP & GM, VSDMay 11, 2026open-market sale12,596—$2M (3)0 of 3
McCarthy Michelle MSVP & Chief Accounting OfficerJun 5, 2026open-market sale2—$1M (3)1 of 3
Moloney Jacqueline FDirectorMay 14, 2026open-market sale8,775—$1M (4)0 of 4
Cannone Peter IIIDirectorMay 18, 2026open-market sale7,794—$732K (2)0 of 2
Donahue Joseph BDirectorMay 27, 2026open-market sale10,033—$689K (1)0 of 1
Williams John EdwardEVP & GM, PSDAug 3, 2026open-market sale4,098—$656K (2)1 of 2
Mora ElizabethDirectorSep 1, 2026open-market sale18,845—$290K (4)4 of 4
Jabre Wissam GDirectorMay 11, 2026award5,270———
Batra RajDirectorMay 11, 2026award16,227———
Colella Gerard GDirectorMay 12, 2025award8,217———

Questions

Are MKS Inc. Common Stock insiders buying or selling?

Over the twelve months to November 1, 2026, 13 insiders at MKS Inc. Common Stock sold $43M of stock in the open market, all by officers and directors, and no insider bought. Net, insiders sold $43M. Only open-market purchases and sales are counted.

Who sold the most MKS Inc. Common Stock stock in the last year?

Lee John Tseng-Chung (President & CEO, Director) sold $14M in 6 open-market sales over the twelve months to November 1, 2026.

Do MKS Inc. Common Stock executives sell under 10b5-1 plans?

18 of the 45 open-market sales in the last twelve months (40%) were reported as made under a Rule 10b5-1 trading plan, set up in advance. A sale under a plan is still counted as a sale.

What counts as insider buying here?

Only open-market purchases (Form 4 code P) and sales (code S) by officers, directors and 10% owners. Stock awards, option exercises, shares withheld for tax and gifts are listed in the table but never counted as buying or selling.

More on MKS Inc. Common Stock

From Form 4, 4/A and 5 filings with the SEC. A record of insider transactions, not a recommendation.