Where can I read MKSI's latest 10-K?

MKSI's latest annual report, a 10-K, was filed on Feb 24, 2026 for the fiscal year ended Dec 31, 2025. It is linked above and opens on EDGAR, the SEC's own site, where every exhibit is also listed.

When did MKSI last file an 8-K?

On Aug 5, 2026: results of operations. An 8-K reports a material event between quarterly reports; the one that furnishes the quarter's results is filed under Item 2.02, last on Aug 5, 2026.

Are MKSI insiders buying or selling?

Over the last 13 months insiders sold $43.4M in 32 sales and bought nothing on the open market; 50 other transactions (awards, exercises, tax withholding, gifts and plan purchases). The most recent sale: Mora Elizabeth (Director) sold 300 shares on Sep 1, 2026 for $75K, under a 10b5-1 plan. Every figure is as the insider filed it on Form 4; a sale under a 10b5-1 plan was scheduled in advance.

How many SEC filings has MKSI made?

2,374 filings are on EDGAR under the registrant records that have been MKS Inc., going back to 1997; 1,703 of them are insider ownership forms (Forms 3, 4, 5 and 144).

Share this page

MKSI

$279.15+2.92%

as of close, Oct 2, 2026

☾ AH $279.15 +2.92%

MKS Inc.Stock · IndustrialsNasdaq Composite 0.04%Russell 1000 0.04%Russell 3000 0.04%

PeersSPCXGEVCATBARKLBGE

MKSI SEC filings (2026)

CIK 1049502 · Industrial Instruments For Measurement, Display, and Control (SIC 3823) · incorporated in MA · fiscal year ends in December

2,374 filings on EDGAR since 1997 · 27 annual, 83 quarterly, 238 current · financial statements · earnings

Latest 10-K

Feb 24, 2026

fiscal year to Dec 31, 2025

Latest 10-Q

Aug 6, 2026

quarter to Jun 30, 2026

Latest 8-K

Aug 5, 2026

Results of operations

Last earnings release

Aug 5, 2026

$3.30 vs $2.94 · ▼ 7.0%

Filings on file

2,374

since 1997, 1,703 insider forms

What happened, last 12 months#

Every earnings release with its print, every report with its quarter, the other 8-Ks by what they covered, the proxy statements, and each day an insider bought or sold — newest first, each line opening the filing on EDGAR. The index by form and year follows.

Insider transactions#

What officers, directors and 10% holders reported on Forms 4 and 5 over the last 13 months, from the documents themselves: one insider’s trades of one kind on one day are one row, with the shares, the price range and the total as filed. Open-market buys and sells first; awards, exercises, tax withholding, gifts and employee-plan purchases are grouped below them.

Over the last 13 months insiders sold $43.4M in 32 sales and bought nothing on the open market; 50 other transactions (awards, exercises, tax withholding, gifts and plan purchases).

Date	Insider	Action	Shares	Price	Value	Held after	Filing
Sep 1, 2026Form 4	Mora ElizabethDirectorSold · $75K · 300 sh · 10b5-1	Sold· 10b5-1 plan	300	$250.96	$75K	18,845.353	Form 4
Aug 14, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorSold · $3.0M · 10,000 sh · 10b5-1	Sold· 10b5-1 plan	10,000	$302.01	$3.0M	134,776.267	Form 4
Aug 3, 2026Form 4	Williams John EdwardEVP & GM, PSDSold · $132K · 457 sh · 10b5-1	Sold· 10b5-1 plan	457	$288.31	$132K	4,097.844	Form 4
Jun 12, 2026Form 4	Schreiner James AlanEVP & COOSold · $1.2M · 3,500 sh	Sold	3,500	$345.52–$347.00	$1.2M	19,201.121	Form 4
Jun 10, 2026Form 4	Schreiner James AlanEVP & COOSold · $248K · 781 sh · 10b5-1	Sold· 10b5-1 plan	781	$317.42	$248K	22,701.121	Form 4
Jun 5, 2026Form 4	McCarthy Michelle MSVP & Chief Accounting OfficerSold · $767K · 2,434 sh · 10b5-1	Sold· 10b5-1 plan	2,434	$315.23	$767K	1.549	Form 4
Jun 1, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDSold · $1.9M · 6,000 sh	Sold	6,000	$314.43	$1.9M	10,421.527	Form 4
Jun 1, 2026Form 4	Mora ElizabethDirectorSold · $95K · 300 sh · 10b5-1	Sold· 10b5-1 plan	300	$318.02	$95K	19,145.353	Form 4
May 27, 2026Form 4	COLELLA GERALD GDirectorSold · $6.7M · 20,000 sh · 10b5-1	Sold· 10b5-1 plan	20,000	$330.38–$338.58	$6.7M	20,017	Form 4
May 27, 2026Form 4	Donahue Joseph BDirectorSold · $689K · 2,100 sh	Sold	2,100	$327.95	$689K	10,032.704	Form 4
May 26, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDSold · $826K · 2,500 sh · 10b5-1	Sold· 10b5-1 plan	2,500	$330.50	$826K	16,341.368	Form 4
May 22, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorSold · $3.2M · 10,000 sh · 10b5-1	Sold· 10b5-1 plan	10,000	$315.48	$3.2M	144,696.108	Form 4
May 22, 2026Form 4	Mayampurath RamakumarEVP & CFOSold · $2.8M · 8,810 sh · 10b5-1	Sold· 10b5-1 plan	8,810	$315.48	$2.8M	1.139	Form 4
May 18, 2026Form 4	CANNONE PETER IIIDirectorSold · $410K · 1,350 sh	Sold	1,350	$303.40	$410K	7,794.039	Form 4
May 14, 2026Form 4	Moloney Jacqueline FDirectorSold · $312K · 1,000 sh	Sold	1,000	$312.20	$312K	8,775.156	Form 4
May 13, 2026Form 4	Moloney Jacqueline FDirectorSold · $447K · 1,400 sh	Sold	1,400	$318.99	$447K	9,775.156	Form 4
May 11, 2026Form 4	Burke Kathleen FlahertyEVP, GC & SecretarySold · $1.4M · 4,355 sh	Sold	4,355	$319.94	$1.4M	49,439.485	Form 4
May 11, 2026Form 4	Taranto Eric RobertEVP & GM, VSDSold · $911K · 2,848.522 sh	Sold	2,848.522	$319.93	$911K	12,596.239	Form 4
Mar 12, 2026Form 4	Moloney Jacqueline FDirectorSold · $73K · 340.107 sh	Sold	340.107	$213.77	$73K	10,393.197	Form 4
Mar 6, 2026Form 4	Taranto Eric RobertEVP & GM, VSDSold · $1.0M · 4,567.879 sh	Sold	4,567.879	$220.52	$1.0M	15,444.761	Form 4
Mar 2, 2026Form 4	Mora ElizabethDirectorSold · $72K · 300 sh · 10b5-1	Sold· 10b5-1 plan	300	$239.44	$72K	18,663.394	Form 4
Feb 24, 2026Form 4	COLELLA GERALD GDirectorSold · $2.5M · 10,000 sh	Sold	10,000	$253.97	$2.5M	40,017	Form 4
Feb 24, 2026Form 4	Schreiner James AlanEVP & COOSold · $1.0M · 4,100 sh	Sold	4,100	$255.00	$1.0M	23,401.962	Form 4
Feb 20, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorSold · $7.7M · 30,000 sh	Sold	30,000	$256.05–$259.70	$7.7M	154,696.108	Form 4
Feb 20, 2026Form 4	COLELLA GERALD GDirectorSold · $2.5M · 10,000 sh	Sold	10,000	$252.90	$2.5M	50,017	Form 4
Feb 20, 2026Form 4	Burke Kathleen FlahertyEVP, GC & SecretarySold · $1.1M · 4,254 sh	Sold	4,254	$250.00	$1.1M	53,794.485	Form 4
Feb 20, 2026Form 4	Williams John EdwardEVP & GM, PSDSold · $524K · 2,042.625 sh	Sold	2,042.625	$256.41	$524K	3,640.099	Form 4
Feb 20, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDSold · $523K · 2,000 sh	Sold	2,000	$261.56	$523K	18,841.368	Form 4
Feb 20, 2026Form 4	McCarthy Michelle MVP & Chief Accounting OfficerSold · $367K · 1,466 sh	Sold	1,466	$249.57–$250.35	$367K	0	Form 4
Feb 20, 2026Form 4	Taranto Eric RobertEVP & GM, VSDSold · $360K · 1,452.73 sh	Sold	1,452.73	$247.55	$360K	20,012.64	Form 4
Feb 20, 2026Form 4	CANNONE PETER IIIDirectorSold · $323K · 1,250 sh	Sold	1,250	$258.06	$323K	8,362.08	Form 4
Feb 20, 2026Form 4	Moloney Jacqueline FDirectorSold · $205K · 829 sh	Sold	829	$247.55	$205K	10,733.304	Form 4

Awards, exercises, withholding and plan purchases · 50 transactions

Date	Insider	Action	Shares	Price	Value	Held after	Filing
Aug 17, 2026Form 4	Donlan Renee MartelEVP, GC & CCOAward · Restricted Stock Unit · — · 954.044 sh	Award· Restricted Stock Unit	954.044	—	—	4,780.571	Form 4
May 11, 2026Form 4	COLELLA GERALD GDirectorAward · — · 781.959 sh	Award	781.959	—	—	8,998.886	Form 4
May 11, 2026Form 4	Batra RajDirectorAward · — · 781.959 sh	Award	781.959	—	—	16,227.298	Form 4
May 11, 2026Form 4	CANNONE PETER IIIDirectorAward · — · 781.959 sh	Award	781.959	—	—	9,144.039	Form 4
May 11, 2026Form 4	Donahue Joseph BDirectorAward · — · 781.959 sh	Award	781.959	—	—	12,132.704	Form 4
May 11, 2026Form 4	Mora ElizabethDirectorAward · — · 781.959 sh	Award	781.959	—	—	19,445.353	Form 4
May 11, 2026Form 4	JABRE WISSAM GDirectorAward · — · 781.959 sh	Award	781.959	—	—	5,269.935	Form 4
May 11, 2026Form 4	Moloney Jacqueline FDirectorAward · — · 781.959 sh	Award	781.959	—	—	11,175.156	Form 4
Apr 17, 2026Form 4	Williams John EdwardEVP & GM, PSDTax withholding · $223K · 825.969 sh	Tax withholding	825.969	$269.89	$223K	4,554.844	Form 4
Apr 17, 2026Form 4	Williams John EdwardEVP & GM, PSDExercise or conversion · — · 1,740.714 sh	Exercise or conversion	1,740.714	—	—	5,380.813	Form 4
Apr 17, 2026Form 4	Williams John EdwardEVP & GM, PSDExercise or conversion · Restricted Stock Unit · — · 1,740.714 sh	Exercise or conversion· Restricted Stock Unit	1,740.714	—	—	6,812.003	Form 4
Apr 15, 2026Form 4	McCarthy Michelle MSVP & Chief Accounting OfficerTax withholding · $377K · 1,375.451 sh	Tax withholding	1,375.451	$274.15	$377K	2,435.549	Form 4
Apr 15, 2026Form 4	McCarthy Michelle MSVP & Chief Accounting OfficerExercise or conversion · — · 3,811 sh	Exercise or conversion	3,811	—	—	3,811	Form 4
Apr 15, 2026Form 4	McCarthy Michelle MSVP & Chief Accounting OfficerExercise or conversion · Restricted Stock Unit · — · 3,811 sh	Exercise or conversion· Restricted Stock Unit	3,811	—	—	7,388.16	Form 4
Apr 15, 2026Form 4	McCarthy Michelle MSVP & Chief Accounting OfficerAward · Restricted Stock Unit · — · 1,672.862 sh	Award· Restricted Stock Unit	1,672.862	—	—	11,199.16	Form 4
Feb 17, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorTax withholding · $8.5M · 32,548.307 sh	Tax withholding	32,548.307	$260.74	$8.5M	184,696.108	Form 4
Feb 17, 2026Form 4	Burke Kathleen FlahertyEVP, GC & SecretaryTax withholding · $1.4M · 5,317.798 sh	Tax withholding	5,317.798	$260.74	$1.4M	58,048.485	Form 4
Feb 17, 2026Form 4	Schreiner James AlanEVP & COOTax withholding · $1.1M · 4,343.764 sh	Tax withholding	4,343.764	$260.74	$1.1M	27,501.962	Form 4
Feb 17, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDTax withholding · $1.1M · 4,097.269 sh	Tax withholding	4,097.269	$260.74	$1.1M	20,841.368	Form 4
Feb 17, 2026Form 4	Taranto Eric RobertEVP & GM, VSDTax withholding · $707K · 2,711.768 sh	Tax withholding	2,711.768	$260.74	$707K	21,465.37	Form 4
Feb 17, 2026Form 4	Mayampurath RamakumarEVP & CFOTax withholding · $656K · 2,515.941 sh	Tax withholding	2,515.941	$260.74	$656K	8,811.139	Form 4
Feb 17, 2026Form 4	Williams John EdwardEVP & GM, PSDTax withholding · $312K · 1,195.485 sh	Tax withholding	1,195.485	$260.74	$312K	5,682.724	Form 4
Feb 17, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorExercise or conversion · — · 69,889.252 sh	Exercise or conversion	69,889.252	—	—	217,244.415	Form 4
Feb 17, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorExercise or conversion · Restricted Stock Unit · — · 69,889.252 sh	Exercise or conversion· Restricted Stock Unit	69,889.252	—	—	84,828.121	Form 4
Feb 17, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorAward · Restricted Stock Unit · — · 15,592.911 sh	Award· Restricted Stock Unit	15,592.911	—	—	154,717.373	Form 4
Feb 17, 2026Form 4	Burke Kathleen FlahertyEVP, GC & SecretaryExercise or conversion · — · 12,206.134 sh	Exercise or conversion	12,206.134	—	—	63,366.283	Form 4
Feb 17, 2026Form 4	Burke Kathleen FlahertyEVP, GC & SecretaryExercise or conversion · Restricted Stock Unit · — · 12,206.134 sh	Exercise or conversion· Restricted Stock Unit	12,206.134	—	—	15,128.986	Form 4
Feb 17, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDExercise or conversion · — · 9,281.817 sh	Exercise or conversion	9,281.817	—	—	24,938.637	Form 4
Feb 17, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDExercise or conversion · Restricted Stock Unit · — · 9,281.817 sh	Exercise or conversion· Restricted Stock Unit	9,281.817	—	—	12,093.416	Form 4
Feb 17, 2026Form 4	Schreiner James AlanEVP & COOExercise or conversion · — · 9,225.392 sh	Exercise or conversion	9,225.392	—	—	31,845.726	Form 4
Feb 17, 2026Form 4	Schreiner James AlanEVP & COOExercise or conversion · Restricted Stock Unit · — · 9,225.392 sh	Exercise or conversion· Restricted Stock Unit	9,225.392	—	—	11,396.475	Form 4
Feb 17, 2026Form 4	Taranto Eric RobertEVP & GM, VSDExercise or conversion · — · 6,472.891 sh	Exercise or conversion	6,472.891	—	—	24,177.138	Form 4
Feb 17, 2026Form 4	Taranto Eric RobertEVP & GM, VSDExercise or conversion · Restricted Stock Unit · — · 6,472.891 sh	Exercise or conversion· Restricted Stock Unit	6,472.891	—	—	8,028.666	Form 4
Feb 17, 2026Form 4	Mayampurath RamakumarEVP & CFOExercise or conversion · — · 5,660.08 sh	Exercise or conversion	5,660.08	—	—	11,327.08	Form 4
Feb 17, 2026Form 4	Mayampurath RamakumarEVP & CFOExercise or conversion · Restricted Stock Unit · — · 5,660.08 sh	Exercise or conversion· Restricted Stock Unit	5,660.08	—	—	23,898.453	Form 4
Feb 17, 2026Form 4	Mayampurath RamakumarEVP & CFOAward · Restricted Stock Unit · — · 4,278.543 sh	Award· Restricted Stock Unit	4,278.543	—	—	29,558.533	Form 4
Feb 17, 2026Form 4	Burke Kathleen FlahertyEVP, GC & SecretaryAward · Restricted Stock Unit · — · 3,327.755 sh	Award· Restricted Stock Unit	3,327.755	—	—	27,335.12	Form 4
Feb 17, 2026Form 4	Williams John EdwardEVP & GM, PSDExercise or conversion · — · 3,238.11 sh	Exercise or conversion	3,238.11	—	—	6,878.209	Form 4
Feb 17, 2026Form 4	Williams John EdwardEVP & GM, PSDExercise or conversion · Restricted Stock Unit · — · 3,238.11 sh	Exercise or conversion· Restricted Stock Unit	3,238.11	—	—	8,552.717	Form 4
Feb 17, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDAward · Restricted Stock Unit · — · 2,567.126 sh	Award· Restricted Stock Unit	2,567.126	—	—	21,375.233	Form 4
Feb 17, 2026Form 4	Schreiner James AlanEVP & COOAward · Restricted Stock Unit · — · 2,376.968 sh	Award· Restricted Stock Unit	2,376.968	—	—	20,621.867	Form 4
Feb 17, 2026Form 4	Taranto Eric RobertEVP & GM, VSDAward · Restricted Stock Unit · — · 1,758.956 sh	Award· Restricted Stock Unit	1,758.956	—	—	14,501.557	Form 4
Feb 17, 2026Form 4	Williams John EdwardEVP & GM, PSDAward · Restricted Stock Unit · — · 1,473.72 sh	Award· Restricted Stock Unit	1,473.72	—	—	11,790.827	Form 4
Feb 8, 2026Form 4	Lee John Tseng-ChungPresident & CEO · DirectorAward · Restricted Stock Unit · — · 50,971.84 sh	Award· Restricted Stock Unit	50,971.84	—	—	139,124.462	Form 4
Feb 8, 2026Form 4	Mayampurath RamakumarEVP & CFOAward · Restricted Stock Unit · — · 8,877.596 sh	Award· Restricted Stock Unit	8,877.596	—	—	25,279.99	Form 4
Feb 8, 2026Form 4	Burke Kathleen FlahertyEVP, GC & SecretaryAward · Restricted Stock Unit · — · 7,008.628 sh	Award· Restricted Stock Unit	7,008.628	—	—	24,007.365	Form 4
Feb 8, 2026Form 4	Henry David PhilipEVP, Global Str Mktg & GM, MSDAward · Restricted Stock Unit · — · 5,521.949 sh	Award· Restricted Stock Unit	5,521.949	—	—	18,808.107	Form 4
Feb 8, 2026Form 4	Schreiner James AlanEVP & COOAward · Restricted Stock Unit · — · 5,226.759 sh	Award· Restricted Stock Unit	5,226.759	—	—	18,244.899	Form 4
Feb 8, 2026Form 4	Taranto Eric RobertEVP & GM, VSDAward · Restricted Stock Unit · — · 3,504.314 sh	Award· Restricted Stock Unit	3,504.314	—	—	12,742.601	Form 4
Feb 8, 2026Form 4	Williams John EdwardEVP & GM, PSDAward · Restricted Stock Unit · — · 2,973.357 sh	Award· Restricted Stock Unit	2,973.357	—	—	10,317.107	Form 4

Reports and proxy statements#

Annual reports (10-K, 20-F, 40-F), quarterly reports (10-Q), current reports (8-K, 6-K) and proxy statements, newest first. An 8-K is described by its items. A form opens the document on EDGAR, or the filing’s index where it furnishes exhibits (an earnings release is the 8-K’s Exhibit 99.1).

2026 · 15 filings

Filed	Form	What it is	Period
Aug 6, 202610-Q	10-Q	Quarterly report, Q2 2026 — revenue $1.25B (+28% y/y), net income $175.0M, EPS $2.41	Jun 30, 2026
Aug 5, 20268-K	8-K	Earnings release — EPS $3.30 vs $2.94 est. (+12.2%); revenue $1.25B (+28% y/y) 7.0%	Aug 5, 2026
May 12, 20268-K	8-K	Directors or officers; compensation; Shareholder vote results	May 11, 2026
May 7, 202610-Q	10-Q	Quarterly report, Q1 2026 — revenue $1.08B (+15% y/y), net income $84.0M, EPS $1.18	Mar 31, 2026
May 6, 20268-K	8-K	Earnings release — EPS $2.30 vs $2.00 est. (+15.0%); revenue $1.08B (+15% y/y) 2.4%	May 6, 2026
Apr 6, 20268-K	8-K	Directors or officers; compensation	Mar 31, 2026
Mar 31, 2026ARS	ARS	Annual report to shareholders	Dec 31, 2025
Mar 31, 2026DEFA14A	DEFA14A	Additional proxy materials	—
Mar 31, 2026DEF 14A	DEF 14A	Proxy statement	May 11, 2026
Mar 20, 2026PRE 14A	PRE 14A	Preliminary proxy statement	May 11, 2026
Feb 24, 202610-K	10-K	Annual report, FY2025 — revenue $3.93B (+10% y/y), net income $295.0M, EPS $4.37	Dec 31, 2025
Feb 17, 20268-K	8-K	Earnings release — EPS $2.47 vs $2.51 est. (−1.6%); revenue $1.03B (+11% y/y) 4.8%	Feb 17, 2026
Feb 5, 20268-K	8-K	Material definitive agreement; New financial obligation; Regulation FD disclosure	Feb 4, 2026
Jan 28, 20268-K	8-K	Other events	Jan 26, 2026
Jan 21, 20268-K	8-K	Results of operations; Regulation FD disclosure	Jan 21, 2026

2025 · 14 filings

Filed	Form	What it is	Period
Nov 6, 202510-Q	10-Q	Quarterly report, Q3 2025 — revenue $988.0M (+10% y/y), net income $74.0M, EPS $1.10	Sep 30, 2025
Nov 5, 20258-K	8-K	Earnings release — EPS $1.93 vs $1.80 est. (+7.2%); revenue $988.0M (+10% y/y) 11.0%	Nov 5, 2025
Aug 7, 202510-Q	10-Q	Quarterly report, Q2 2025 — revenue $973.0M (+10% y/y), net income $62.0M, EPS $0.92	Jun 30, 2025
Aug 6, 20258-K	8-K	Results of operations	Aug 6, 2025
May 15, 20258-K	8-K	Change to security holders' rights; Directors or officers; compensation; Charter, bylaws or fiscal-year change; Shareholder vote results; Regulation FD disclosure	May 12, 2025
May 8, 202510-Q	10-Q	Quarterly report, Q1 2025 — revenue $936.0M (+8% y/y), net income $52.0M, EPS $0.77	Mar 31, 2025
May 7, 20258-K	8-K	Results of operations	May 7, 2025
Apr 1, 2025ARS	ARS	Annual report to shareholders	Dec 31, 2024
Apr 1, 2025DEFA14A	DEFA14A	Additional proxy materials	—
Apr 1, 2025DEF 14A	DEF 14A	Proxy statement	May 12, 2025
Mar 21, 2025PRE 14A	PRE 14A	Preliminary proxy statement	May 12, 2025
Feb 25, 202510-K	10-K	Annual report, FY2024 — revenue $3.59B (−1% y/y), net income $190.0M, EPS $2.81	Dec 31, 2024
Feb 12, 20258-K	8-K	Results of operations	Feb 12, 2025
Jan 24, 20258-K	8-K	Material definitive agreement; New financial obligation; Regulation FD disclosure	Jan 24, 2025

2024 · 24 filings

Filed	Form	What it is	Period
Dec 3, 20248-K	8-K	Charter, bylaws or fiscal-year change	Dec 2, 2024
Nov 7, 202410-Q	10-Q	Quarterly report, Q3 2024 — revenue $896.0M (−4% y/y), net income $62.0M, EPS $0.92	Sep 30, 2024
Nov 6, 20248-K	8-K	Results of operations	Nov 6, 2024
Nov 5, 20248-K	8-K	Directors or officers; compensation; Regulation FD disclosure	Nov 4, 2024
Aug 13, 20248-K	8-K	Directors or officers; compensation; Regulation FD disclosure	Aug 5, 2024
Aug 8, 202410-Q	10-Q	Quarterly report, Q2 2024 — revenue $887.0M (−12% y/y), net income $23.0M, EPS $0.33	Jun 30, 2024
Aug 7, 20248-K	8-K	Results of operations	Aug 7, 2024
Jul 23, 20248-K	8-K	Material definitive agreement; New financial obligation; Regulation FD disclosure	Jul 23, 2024
Jun 20, 20248-K	8-K	Regulation FD disclosure	Jun 20, 2024
May 16, 20248-K	8-K	Material definitive agreement; New financial obligation; Unregistered sale of equity	May 16, 2024
May 14, 20248-K	8-K	Other events	May 13, 2024
May 13, 20248-K	8-K	Other events	May 13, 2024
May 9, 202410-Q	10-Q	Quarterly report, Q1 2024 — revenue $868.0M (+9% y/y), net income $15.0M, EPS $0.22	Mar 31, 2024
May 8, 20248-K	8-K	Results of operations	May 8, 2024
May 8, 20248-K	8-K	Directors or officers; compensation; Shareholder vote results	May 7, 2024
Apr 1, 20248-K	8-K	Directors or officers; compensation	Apr 1, 2024
Mar 27, 2024ARS	ARS	Annual report to shareholders	Dec 31, 2023
Mar 27, 2024DEFA14A	DEFA14A	Additional proxy materials	—
Mar 27, 2024DEF 14A	DEF 14A	Proxy statement	May 7, 2024
Feb 27, 202410-K	10-K	Annual report, FY2023 — revenue $3.62B (+2% y/y), net income −$1.84B, EPS −$27.54	Dec 31, 2023
Feb 14, 20248-K	8-K	Material definitive agreement; New financial obligation	Feb 13, 2024
Feb 8, 20248-K	8-K	Directors or officers; compensation	Feb 5, 2024
Feb 7, 20248-K	8-K	Results of operations	Feb 7, 2024
Jan 22, 20248-K	8-K	Material definitive agreement; New financial obligation; Regulation FD disclosure	Jan 22, 2024

2023 · 17 filings — 10 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms

Filed	Form	What it is	Period
Nov 8, 202310-Q	10-Q	Quarterly report, Q3 2023 — revenue $932.0M (−2% y/y), net income $39.0M, EPS $0.58	Sep 30, 2023
Aug 4, 202310-Q	10-Q	Quarterly report, Q2 2023 — revenue $1.00B (+31% y/y), net income −$1.77B, EPS −$26.47	Jun 30, 2023
May 5, 202310-Q	10-Q	Quarterly report, Q1 2023 — revenue $794.0M (+7% y/y), net income −$42.0M, EPS −$0.64	Mar 31, 2023
Apr 5, 2023ARS	ARS	Annual report to shareholders	Dec 31, 2022
Apr 5, 2023DEFA14A	DEFA14A	Additional proxy materials	—
Apr 5, 2023DEF 14A	DEF 14A	Proxy statement	—
Mar 14, 202310-K	10-K	Annual report, FY2022 — revenue $3.55B (+20% y/y), net income $333.0M, EPS $5.56	Dec 31, 2022

10 current reports (8-K) not listed; the year is on EDGAR.

2022 · 20 filings — 12 × 8-K, 3 × 10-Q, 2 × 8-K/A and 3 other forms

Filed	Form	What it is	Period
Nov 7, 202210-Q	10-Q	Quarterly report, Q3 2022 — revenue $954.0M (+29% y/y), net income $6.0M, EPS $0.09	Sep 30, 2022
Aug 3, 202210-Q	10-Q	Quarterly report, Q2 2022 — revenue $765.0M (+2% y/y), net income $130.0M, EPS $2.32	Jun 30, 2022
May 2, 202210-Q	10-Q	Quarterly report, Q1 2022 — revenue $742.0M (+7% y/y), net income $143.0M, EPS $2.57	Mar 31, 2022
Mar 31, 2022DEFA14A	DEFA14A	Additional proxy materials	—
Mar 31, 2022DEF 14A	DEF 14A	Proxy statement	May 10, 2022
Feb 28, 202210-K	10-K	Annual report, FY2021 — revenue $2.95B (+27% y/y), net income $551.0M, EPS $9.90	Dec 31, 2021

14 current reports (8-K) not listed; the year is on EDGAR.

2021 · 24 filings — 18 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Filed	Form	What it is	Period
Nov 3, 202110-Q	10-Q	Quarterly report, Q3 2021 — revenue $742.0M (+26% y/y), net income $132.0M, EPS $2.38	Sep 30, 2021
Aug 5, 202110-Q	10-Q	Quarterly report, Q2 2021 — revenue $750.0M (+38% y/y), net income $146.0M, EPS $2.63	Jun 30, 2021
May 4, 202110-Q	10-Q	Quarterly report, Q1 2021 — revenue $694.0M (+30% y/y), net income $122.0M, EPS $2.20	Mar 31, 2021
Mar 26, 2021DEFA14A	DEFA14A	Additional proxy materials	—
Mar 26, 2021DEF 14A	DEF 14A	Proxy statement	May 11, 2021
Feb 23, 202110-K	10-K	Annual report, FY2020 — revenue $2.33B (+23% y/y), net income $350.0M, EPS $6.33	Dec 31, 2020

18 current reports (8-K) not listed; the year is on EDGAR.

2020 · 13 filings — 6 × 8-K, 3 × 10-Q, 2 × DEFA14A and 2 other forms

Filed	Form	What it is	Period
Nov 3, 202010-Q	10-Q	Quarterly report, Q3 2020 — revenue $589.8M (+28% y/y), net income $91.7M, EPS $1.66	Sep 30, 2020
Aug 3, 202010-Q	10-Q	Quarterly report, Q2 2020 — revenue $544.3M (+15% y/y), net income $73.7M, EPS $1.33	Jun 30, 2020
May 6, 202010-Q	10-Q	Quarterly report, Q1 2020 — revenue $535.7M (+16% y/y), net income $69.1M, EPS $1.25	Mar 31, 2020
Apr 8, 2020DEFA14A	DEFA14A	Additional proxy materials	—
Mar 27, 2020DEFA14A	DEFA14A	Additional proxy materials	—
Mar 27, 2020DEF 14A	DEF 14A	Proxy statement	May 12, 2020
Feb 28, 202010-K	10-K	Annual report, FY2019 — revenue $1.90B (−8% y/y), net income $140.4M, EPS $2.55	Dec 31, 2019

6 current reports (8-K) not listed; the year is on EDGAR.

2019 · 19 filings — 11 × 8-K, 3 × 10-Q, 2 × DEFA14A and 3 other forms

Filed	Form	What it is	Period
Nov 6, 201910-Q	10-Q	Quarterly report, Q3 2019 — revenue $462.5M (−5% y/y), net income $47.4M, EPS $0.86	Sep 30, 2019
Aug 7, 201910-Q	10-Q	Quarterly report, Q2 2019 — revenue $474.1M (−17% y/y), net income $37.7M, EPS $0.69	Jun 30, 2019
May 8, 201910-Q	10-Q	Quarterly report, Q1 2019 — revenue $463.6M (−16% y/y), net income $12.5M, EPS $0.23	Mar 31, 2019
Apr 30, 2019DEFA14A	DEFA14A	Additional proxy materials	—
Mar 28, 2019DEFA14A	DEFA14A	Additional proxy materials	—
Mar 28, 2019DEF 14A	DEF 14A	Proxy statement	May 8, 2019
Feb 26, 201910-K	10-K	Annual report, FY2018 — revenue $2.08B (+8% y/y), net income $392.9M, EPS $7.14	Dec 31, 2018

12 current reports (8-K) not listed; the year is on EDGAR.

2018 · 24 filings — 14 × 8-K, 4 × DFAN14A, 3 × 10-Q and 3 other forms

Filed	Form	What it is	Period
Dec 14, 2018DFAN14A	DFAN14A	8-K	—
Nov 6, 201810-Q	10-Q	Quarterly report, Q3 2018 — revenue $487.2M (+0% y/y), net income $93.3M, EPS $1.70	Sep 30, 2018
Nov 1, 2018DFAN14A	DFAN14A	8-K	—
Oct 30, 2018DFAN14A	DFAN14A	8-K	—
Oct 30, 2018DFAN14A	DFAN14A	FORM 8-K	—
Aug 7, 201810-Q	10-Q	Quarterly report, Q2 2018 — revenue $573.1M (+19% y/y), net income $122.9M, EPS $2.22	Jun 30, 2018
May 8, 201810-Q	10-Q	Quarterly report, Q1 2018 — revenue $554.3M (+27% y/y), net income $105.1M, EPS $1.90	Mar 31, 2018
Mar 28, 2018DEFA14A	DEFA14A	Additional proxy materials	—
Mar 28, 2018DEF 14A	DEF 14A	Proxy statement	May 9, 2018
Feb 28, 201810-K	10-K	Annual report, FY2017 — revenue $1.92B (+48% y/y), net income $339.1M, EPS $6.16	Dec 31, 2017

14 current reports (8-K) not listed; the year is on EDGAR.

2017 · 12 filings — 7 × 8-K, 3 × 10-Q, 1 × 10-K and 1 other form

Filed	Form	What it is	Period
Nov 3, 201710-Q	10-Q	Quarterly report, Q3 2017 — revenue $486.3M (+28% y/y), net income $76.0M, EPS $1.38	Sep 30, 2017
Aug 3, 201710-Q	10-Q	Quarterly report, Q2 2017 — revenue $480.8M (+48% y/y), net income $120.4M, EPS $2.19	Jun 30, 2017
May 9, 201710-Q	10-Q	Quarterly report, Q1 2017 — revenue $437.2M (+138% y/y), net income $65.1M, EPS $1.18	Mar 31, 2017
Mar 24, 2017DEF 14A	DEF 14A	Proxy statement	May 10, 2017
Mar 1, 201710-K	10-K	Annual report, FY2016 — revenue $1.30B (+59% y/y), net income $104.8M, EPS $1.94	Dec 31, 2016

7 current reports (8-K) not listed; the year is on EDGAR.

2016 · 24 filings — 15 × 8-K, 3 × 10-Q, 3 × DFAN14A and 3 other forms

Counted, not listed; the year is on EDGAR.

2015 · 12 filings — 6 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2014 · 12 filings — 6 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2013 · 15 filings — 9 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2012 · 11 filings — 5 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2011 · 12 filings — 5 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms

Counted, not listed; the year is on EDGAR.

2010 · 14 filings — 8 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2009 · 18 filings — 11 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms

Counted, not listed; the year is on EDGAR.

2008 · 14 filings — 8 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2007 · 11 filings — 6 × 8-K, 3 × 10-Q, 1 × 10-K and 1 other form

Counted, not listed; the year is on EDGAR.

2006 · 16 filings — 10 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2005 · 19 filings — 12 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms

Counted, not listed; the year is on EDGAR.

2004 · 14 filings — 9 × 8-K, 3 × 10-Q, 1 × 10-K and 1 other form

Counted, not listed; the year is on EDGAR.

2003 · 10 filings — 4 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms

Counted, not listed; the year is on EDGAR.

2002 · 10 filings — 3 × 10-Q, 1 × 10-K, 1 × 8-K and 5 other forms

Counted, not listed; the year is on EDGAR.

2001 · 14 filings — 5 × 8-K, 3 × 10-Q, 1 × 10-K405 and 5 other forms

Counted, not listed; the year is on EDGAR.

2000 · 7 filings — 3 × 10-Q, 2 × 8-K, 1 × 10-K and 1 other form

Counted, not listed; the year is on EDGAR.

1999 · 3 filings — 3 × 10-Q

Counted, not listed; the year is on EDGAR.

Insider, ownership and other filings#

Insider ownership (Forms 3, 4, 5 and 144), beneficial ownership (Schedules 13D and 13G), registration and prospectus (S-1, S-3, S-8, 424B and related) and the rest, counted by year, with the newest 25 of each of the latest 3 years shown. A Form 4 is one insider’s transaction report; a 13G is a passive holder above five percent.

2026 · 96 filings — 55 × 4, 31 × 144, 4 × SCHEDULE 13G/A and 4 other forms

Filed	Form	What it is	Period
Sep 2, 20264	4	Insider transaction (Form 4)	Sep 1, 2026
Sep 1, 2026144	144	Notice of proposed sale (Form 144)	—
Aug 18, 20264	4	Insider transaction (Form 4)	Aug 17, 2026
Aug 17, 20264	4	Insider transaction (Form 4)	Aug 14, 2026
Aug 14, 2026144	144	Notice of proposed sale (Form 144)	—
Aug 4, 20264	4	Insider transaction (Form 4)	Aug 3, 2026
Aug 3, 2026144	144	Notice of proposed sale (Form 144)	—
Jul 24, 2026SCHEDULE 13G/A	SCHEDULE 13G/A	Other filings	—
Jun 16, 20264	4	Insider transaction (Form 4)	Jun 12, 2026
Jun 12, 2026144	144	Notice of proposed sale (Form 144)	—
Jun 11, 20264	4	Insider transaction (Form 4)	Jun 10, 2026
Jun 10, 2026144	144	Notice of proposed sale (Form 144)	—
Jun 8, 20264	4	Insider transaction (Form 4)	Jun 5, 2026
Jun 5, 2026144	144	Notice of proposed sale (Form 144)	—
Jun 4, 20263	3	Initial insider holdings (Form 3)	Jun 1, 2026
Jun 2, 20264	4	Insider transaction (Form 4)	Jun 1, 2026
Jun 2, 20264	4	Insider transaction (Form 4)	Jun 1, 2026
Jun 1, 2026144	144	Notice of proposed sale (Form 144)	—
Jun 1, 2026144	144	Notice of proposed sale (Form 144)	—
May 28, 2026SD	SD	Specialized disclosure (conflict minerals)	—
May 28, 20264	4	Insider transaction (Form 4)	May 27, 2026
May 28, 20264	4	Insider transaction (Form 4)	May 27, 2026
May 27, 20264	4	Insider transaction (Form 4)	May 26, 2026
May 27, 2026144	144	Notice of proposed sale (Form 144)	—
May 27, 2026144	144	Notice of proposed sale (Form 144)	—

The newest 25 of 96 shown; the full year is on EDGAR.

2025 · 61 filings — 41 × 4, 13 × 144, 5 × SCHEDULE 13G/A and 2 other forms

Filed	Form	What it is	Period
Dec 3, 20254	4	Insider transaction (Form 4)	Dec 2, 2025
Dec 2, 2025144	144	Notice of proposed sale (Form 144)	—
Nov 18, 20254	4	Insider transaction (Form 4)	Nov 17, 2025
Nov 4, 20254	4	Insider transaction (Form 4)	Oct 31, 2025
Nov 4, 20254	4	Insider transaction (Form 4)	Oct 31, 2025
Oct 31, 2025SCHEDULE 13G/A	SCHEDULE 13G/A	Other filings	—
Oct 23, 20254	4	Insider transaction (Form 4)	Oct 22, 2025
Oct 22, 2025144	144	Notice of proposed sale (Form 144)	—
Oct 2, 20254	4	Insider transaction (Form 4)	Oct 1, 2025
Oct 1, 2025144	144	Notice of proposed sale (Form 144)	—
Sep 19, 20254	4	Insider transaction (Form 4)	Sep 18, 2025
Sep 19, 20254	4	Insider transaction (Form 4)	Sep 18, 2025
Sep 18, 2025144	144	Notice of proposed sale (Form 144)	—
Sep 18, 2025144	144	Notice of proposed sale (Form 144)	—
Sep 3, 20254	4	Insider transaction (Form 4)	Sep 2, 2025
Sep 2, 2025144	144	Notice of proposed sale (Form 144)	—
Aug 19, 20254	4	Insider transaction (Form 4)	Aug 18, 2025
Aug 18, 20254	4	Insider transaction (Form 4)	Aug 15, 2025
Aug 14, 2025SCHEDULE 13G/A	SCHEDULE 13G/A	Other filings	—
Aug 8, 2025SCHEDULE 13G/A	SCHEDULE 13G/A	Other filings	—
Aug 8, 2025SCHEDULE 13G	SCHEDULE 13G	Other filings	—
Aug 5, 20254	4	Insider transaction (Form 4)	Aug 4, 2025
Aug 4, 20254	4	Insider transaction (Form 4)	Aug 1, 2025
Aug 1, 2025144	144	Notice of proposed sale (Form 144)	—
Jul 8, 20254	4	Insider transaction (Form 4)	Jul 7, 2025

The newest 25 of 61 shown; the full year is on EDGAR.

2024 · 77 filings — 45 × 4, 16 × 144, 7 × SC 13G/A and 5 other forms

Filed	Form	What it is	Period
Dec 11, 20244	4	Insider transaction (Form 4)	Dec 10, 2024
Dec 10, 20244	4	Insider transaction (Form 4)	Dec 6, 2024
Dec 10, 2024144	144	Notice of proposed sale (Form 144)	—
Dec 3, 20244	4	Insider transaction (Form 4)	Dec 2, 2024
Dec 2, 2024144	144	Notice of proposed sale (Form 144)	—
Nov 18, 20244	4	Insider transaction (Form 4)	Nov 15, 2024
Nov 14, 2024SC 13G/A	SC 13G/A	Passive holder above 5% (Schedule 13G), amended	—
Nov 7, 2024SC 13G/A	SC 13G/A	Passive holder above 5% (Schedule 13G), amended	—
Nov 5, 20244	4	Insider transaction (Form 4)	Nov 4, 2024
Nov 5, 20243	3	Initial insider holdings (Form 3)	Nov 4, 2024
Oct 16, 20243	3	Initial insider holdings (Form 3)	Oct 14, 2024
Oct 2, 20244	4	Insider transaction (Form 4)	Oct 1, 2024
Oct 1, 2024144	144	Notice of proposed sale (Form 144)	—
Sep 10, 2024SC 13G/A	SC 13G/A	Passive holder above 5% (Schedule 13G), amended	—
Sep 4, 20244	4	Insider transaction (Form 4)	Sep 3, 2024
Sep 3, 2024144	144	Notice of proposed sale (Form 144)	—
Aug 20, 20244	4	Insider transaction (Form 4)	Aug 19, 2024
Aug 19, 20244	4	Insider transaction (Form 4)	Aug 16, 2024
Aug 19, 20244	4	Insider transaction (Form 4)	Aug 15, 2024
Aug 16, 2024144	144	Notice of proposed sale (Form 144)	—
Aug 16, 20244	4	Insider transaction (Form 4)	Aug 15, 2024
Aug 2, 20244	4	Insider transaction (Form 4)	Aug 1, 2024
Aug 1, 2024144	144	Notice of proposed sale (Form 144)	—
Jul 15, 2024144	144	Notice of proposed sale (Form 144)	—
Jun 4, 20244	4	Insider transaction (Form 4)	Jun 3, 2024

The newest 25 of 77 shown; the full year is on EDGAR.

2023 · 66 filings — 39 × 4, 16 × 144, 6 × SC 13G/A and 4 other forms

Counted, not listed; the year is on EDGAR.

2022 · 55 filings — 46 × 4, 4 × SC 13G/A, 2 × 3 and 3 other forms

Counted, not listed; the year is on EDGAR.

2021 · 56 filings — 41 × 4, 5 × SC 13G/A, 4 × 3 and 3 other forms

Counted, not listed; the year is on EDGAR.

2020 · 43 filings — 35 × 4, 3 × 3, 2 × SC 13G and 2 other forms

Counted, not listed; the year is on EDGAR.

2019 · 38 filings — 30 × 4, 3 × SC 13G/A, 2 × 3 and 3 other forms

Counted, not listed; the year is on EDGAR.

2018 · 53 filings — 47 × 4, 4 × SC 13G/A, 1 × 3 and 1 other form

Counted, not listed; the year is on EDGAR.

2017 · 72 filings — 57 × 4, 6 × SC 13G/A, 3 × CT ORDER and 5 other forms

Counted, not listed; the year is on EDGAR.

2016 · 76 filings — 63 × 4, 5 × SC 13G/A, 3 × 3 and 4 other forms

Counted, not listed; the year is on EDGAR.

2015 · 68 filings — 60 × 4, 4 × SC 13G/A, 3 × CT ORDER and 1 other form

Counted, not listed; the year is on EDGAR.

2014 · 78 filings — 63 × 4, 5 × SC 13G/A, 4 × CT ORDER and 4 other forms

Counted, not listed; the year is on EDGAR.

2013 · 67 filings — 57 × 4, 4 × SC 13G/A, 3 × CT ORDER and 2 other forms

Counted, not listed; the year is on EDGAR.

2012 · 97 filings — 69 × 4, 13 × 4/A, 4 × CORRESP and 7 other forms

Counted, not listed; the year is on EDGAR.

2011 · 95 filings — 81 × 4, 5 × 5, 5 × SC 13G/A and 4 other forms

Counted, not listed; the year is on EDGAR.

2010 · 93 filings — 75 × 4, 7 × 5, 5 × SC 13G/A and 2 other forms

Counted, not listed; the year is on EDGAR.

2009 · 81 filings — 57 × 4, 5 × SC TO-I/A, 4 × CORRESP and 7 other forms

Counted, not listed; the year is on EDGAR.

2008 · 88 filings — 78 × 4, 4 × SC 13G/A, 2 × CT ORDER and 3 other forms

Counted, not listed; the year is on EDGAR.

2007 · 143 filings — 131 × 4, 7 × SC 13G/A, 2 × 3 and 2 other forms

Counted, not listed; the year is on EDGAR.

2006 · 175 filings — 162 × 4, 6 × SC 13G/A, 4 × 4/A and 2 other forms

Counted, not listed; the year is on EDGAR.

2005 · 68 filings — 60 × 4, 3 × SC 13G/A, 2 × SC 13G and 3 other forms

Counted, not listed; the year is on EDGAR.

2004 · 69 filings — 40 × 4, 14 × 5, 3 × S-8 and 7 other forms

Counted, not listed; the year is on EDGAR.

2003 · 104 filings — 90 × 4, 9 × 4/A, 2 × SC 13G/A and 3 other forms

Counted, not listed; the year is on EDGAR.

2002 · 6 filings — 3 × S-8, 1 × REGDEX, 1 × REGDEX/A and 1 other form

Counted, not listed; the year is on EDGAR.

2001 · 5 filings — 3 × S-8, 1 × SC 13G, 1 × SC 13G/A

Counted, not listed; the year is on EDGAR.

2000 · 11 filings — 4 × 425, 1 × S-3, 1 × S-3/A and 5 other forms

Counted, not listed; the year is on EDGAR.

1999 · 9 filings — 3 × S-1/A, 3 × S-8, 1 × 424B1 and 2 other forms

Counted, not listed; the year is on EDGAR.

1998 · 4 filings — 2 × RW, 1 × 8-A12G, 1 × S-1/A

Counted, not listed; the year is on EDGAR.

1997 · 2 filings — 1 × S-1, 1 × S-1/A

Counted, not listed; the year is on EDGAR.

About this data

MKS Inc. (MKSI) has 2,374 filings on EDGAR going back to 1997: 27 annual reports, 83 quarterly reports and 238 current reports, plus proxy statements, insider forms and ownership schedules. Its latest annual report, a 10-K, was filed on Feb 24, 2026 for the fiscal year ended Dec 31, 2025. The most recent 8-K, on Aug 5, 2026, covered results of operations. Over the last 13 months insiders sold $43.4M in 32 sales and bought nothing on the open market; 50 other transactions (awards, exercises, tax withholding, gifts and plan purchases). Not investment advice.

Every row is a filing EDGAR lists for the registrants that have been MKS Inc., read from the SEC’s submissions index each morning; a filing accepted after that read appears the next day. Where a company changed its filing entity (a holding-company reorganisation, Google into Alphabet) the predecessor’s filings are shown for the years it filed as the company, derived from the filings themselves. Dates are the filing date; the period is the report’s own. The latest 3 years of reports are listed in full, the next years to 10 without their 8-Ks, and older years are counted; the other forms are counted too, with the newest 25 of each of the latest 3 years shown. Insider transactions are the Form 4 and Form 5 documents themselves, filed since January 2026, every number as the insider filed it: a day’s lots are summed, a blank price adds its shares and no dollars, and a purchase through an employee stock plan is a plan purchase, not insider buying. The documents stay on sec.gov, public domain, and every link opens the SEC’s copy. ChartRow does not summarise or interpret filings.

FAQ#

Where can I read MKSI's latest 10-K?: MKSI's latest annual report, a 10-K, was filed on Feb 24, 2026 for the fiscal year ended Dec 31, 2025. It is linked above and opens on EDGAR, the SEC's own site, where every exhibit is also listed.
When did MKSI last file an 8-K?: On Aug 5, 2026: results of operations. An 8-K reports a material event between quarterly reports; the one that furnishes the quarter's results is filed under Item 2.02, last on Aug 5, 2026.
Are MKSI insiders buying or selling?: Over the last 13 months insiders sold $43.4M in 32 sales and bought nothing on the open market; 50 other transactions (awards, exercises, tax withholding, gifts and plan purchases). The most recent sale: Mora Elizabeth (Director) sold 300 shares on Sep 1, 2026 for $75K, under a 10b5-1 plan. Every figure is as the insider filed it on Form 4; a sale under a 10b5-1 plan was scheduled in advance.
How many SEC filings has MKSI made?: 2,374 filings are on EDGAR under the registrant records that have been MKS Inc., going back to 1997; 1,703 of them are insider ownership forms (Forms 3, 4, 5 and 144).

MKSI SEC filings (2026)

What happened, last 12 months#

September 2026

August 2026

June 2026

May 2026

April 2026

March 2026

February 2026

January 2026

November 2025

Insider transactions#

Reports and proxy statements#

Insider, ownership and other filings#

About this data

FAQ#