MKS (NASDAQ: MKSI) insider transactions

In the twelve months to 10 November 2026, executives and directors of MKS reported 45 open-market sales of 151,038 shares ($43.4m) and 0 open-market purchases, by 13 people, according to the Form 4 filings they submitted to the SEC.

Latest transactions

The 20 most recent transactions in MKS shares reported on Form 4
Date	Insider	Role	Transaction	Shares	Price	Held after	Filing
30 October 2026	Lee John Tseng-Chung	President & CEO	Option exercise	+1,479	—	136,255	Form 4
30 October 2026	Lee John Tseng-Chung	President & CEO	Option exercise	+679	—	136,934	Form 4
30 October 2026	Lee John Tseng-Chung	President & CEO	Shares withheld for tax	−2,157	$202.04	134,776	Form 4
1 September 2026	Mora Elizabeth	Director	Open-market sale, 10b5-1 plan	−300	$250.96	18,845	Form 4
14 August 2026	Lee John Tseng-Chung	President & CEO	Open-market sale, 10b5-1 plan	−10,000	$302.01	134,776	Form 4
3 August 2026	Williams John Edward	EVP & Gm, Psd	Open-market sale, 10b5-1 plan	−457	$288.31	4,098	Form 4
12 June 2026	Schreiner James Alan	EVP & COO	Open-market sale	−2,471	$345.52	20,230	Form 4
12 June 2026	Schreiner James Alan	EVP & COO	Open-market sale	−812	$346.41	19,418	Form 4
12 June 2026	Schreiner James Alan	EVP & COO	Open-market sale	−217	$347.00	19,201	Form 4
10 June 2026	Schreiner James Alan	EVP & COO	Open-market sale, 10b5-1 plan	−781	$317.42	22,701	Form 4
5 June 2026	McCarthy Michelle M	SVP & Chief Accounting Officer	Open-market sale, 10b5-1 plan	−2,434	$315.23	2	Form 4
1 June 2026	Mora Elizabeth	Director	Open-market sale, 10b5-1 plan	−300	$318.02	19,145	Form 4
1 June 2026	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Open-market sale	−6,000	$314.43	10,422	Form 4
27 May 2026	Colella Gerald G	Director	Open-market sale, 10b5-1 plan	−464	$330.38	39,553	Form 4
27 May 2026	Colella Gerald G	Director	Open-market sale, 10b5-1 plan	−8,210	$331.45	31,343	Form 4
27 May 2026	Colella Gerald G	Director	Open-market sale, 10b5-1 plan	−4,876	$332.04	26,467	Form 4
27 May 2026	Colella Gerald G	Director	Open-market sale, 10b5-1 plan	−1,811	$335.46	24,656	Form 4
27 May 2026	Colella Gerald G	Director	Open-market sale, 10b5-1 plan	−1,626	$336.54	23,030	Form 4
27 May 2026	Colella Gerald G	Director	Open-market sale, 10b5-1 plan	−213	$337.05	22,817	Form 4
27 May 2026	Colella Gerald G	Director	Open-market sale, 10b5-1 plan	−2,800	$338.58	20,017	Form 4

Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.

How to read the table

Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.

Where each row comes from

From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the MKS page; the method, in data sources.

Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.