MKS Instruments Inc (MKSI) · Insider trading

What MKS Instruments's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months

0 insiders, 0 trades

Sold, 12 months

$43.50M

13 insiders, 41% under a plan

Net, 12 months

−$43.50M

bought less sold

Latest filing

2026-09-02

filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

Bought Sold Largest month: $17.59M

Who traded, two years

Insider	Bought	Sold	Trades	Last trade	Holds after
Lee John Tseng-ChungDirector, President & CEO	–	$13.88M	6	2026-08-14	134,776
Colella Gerald GDirector	–	$12.57M	10	2026-05-27	–
Henry David PhilipEVP, Global Str Mktg & GM, MSD	–	$4.10M	5	2026-06-01	10,422
Schreiner James AlanEVP & COO	–	$2.80M	8	2026-06-12	20,230
Mayampurath RamakumarEVP & CFO	–	$2.78M	1	2026-05-22	1
Burke Kathleen FlahertyEVP, GC & Secretary	–	$2.46M	2	2026-05-11	49,439
Taranto Eric RobertEVP & GM, VSD	–	$2.28M	3	2026-05-11	12,596
Moloney Jacqueline FDirector	–	$1.16M	8	2026-05-14	8,775
McCarthy Michelle MSVP & Chief Accounting Officer	–	$1.13M	3	2026-06-05	2
Cannone Peter IIIDirector	–	$732,165	2	2026-05-18	7,794
Donahue Joseph BDirector	–	$688,695	1	2026-05-27	10,033
Williams John EdwardEVP & GM, PSD	–	$655,508	2	2026-08-03	4,098
Mora ElizabethDirector	–	$401,272	8	2026-09-01	18,845

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

Date	Insider	Trade	Shares	Price	Value	Holds after	Filing
2026-09-01	Mora ElizabethDirector	Saleplan	300	250.96	$75,288	18,845	Form 4
2026-08-14	Lee John Tseng-ChungDirector, President & CEO	Saleplan	10,000	302.01	$3.02M	134,776	Form 4
2026-08-03	Williams John EdwardEVP & GM, PSD	Saleplan	457	288.31	$131,758	4,098	Form 4
2026-06-12	Schreiner James AlanEVP & COO	Sale	2,471	345.52	$853,780	20,230	Form 4
2026-06-12	Schreiner James AlanEVP & COO	Sale	812	346.41	$281,285	19,418	Form 4
2026-06-12	Schreiner James AlanEVP & COO	Sale	217	347.00	$75,299	19,201	Form 4
2026-06-10	Schreiner James AlanEVP & COO	Saleplan	781	317.42	$247,905	22,701	Form 4
2026-06-05	McCarthy Michelle MSVP & Chief Accounting Officer	Saleplan	2,434	315.23	$767,270	2	Form 4
2026-06-01	Mora ElizabethDirector	Saleplan	300	318.02	$95,406	19,145	Form 4
2026-06-01	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Sale	6,000	314.43	$1.89M	10,422	Form 4
2026-05-27	Colella Gerald GDirector	Saleplanindirect	464	330.38	$153,296	39,553	Form 4
2026-05-27	Colella Gerald GDirector	Saleplanindirect	8,210	331.45	$2.72M	31,343	Form 4
2026-05-27	Colella Gerald GDirector	Saleplanindirect	4,876	332.04	$1.62M	26,467	Form 4
2026-05-27	Colella Gerald GDirector	Saleplanindirect	1,811	335.46	$607,518	24,656	Form 4
2026-05-27	Colella Gerald GDirector	Saleplanindirect	1,626	336.54	$547,214	23,030	Form 4
2026-05-27	Colella Gerald GDirector	Saleplanindirect	213	337.05	$71,792	22,817	Form 4
2026-05-27	Colella Gerald GDirector	Saleplanindirect	2,800	338.58	$948,024	20,017	Form 4
2026-05-27	Donahue Joseph BDirector	Sale	2,100	327.95	$688,695	10,033	Form 4
2026-05-26	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Saleplan	2,500	330.50	$826,250	16,341	Form 4
2026-05-22	Lee John Tseng-ChungDirector, President & CEO	Saleplan	10,000	315.48	$3.15M	144,696	Form 4
2026-05-22	Mayampurath RamakumarEVP & CFO	Saleplan	8,810	315.48	$2.78M	1	Form 4
2026-05-18	Cannone Peter IIIDirector	Sale	1,350	303.40	$409,590	7,794	Form 4
2026-05-14	Moloney Jacqueline FDirector	Sale	1,000	312.20	$312,200	8,775	Form 4
2026-05-13	Moloney Jacqueline FDirector	Sale	1,400	318.99	$446,586	9,775	Form 4
2026-05-11	Burke Kathleen FlahertyEVP, GC & Secretary	Sale	4,355	319.94	$1.39M	49,439	Form 4
2026-05-11	Taranto Eric RobertEVP & GM, VSD	Sale	2,849	319.93	$911,327	12,596	Form 4
2026-03-12	Moloney Jacqueline FDirector	Sale	340	213.77	$72,705	10,393	Form 4
2026-03-06	Taranto Eric RobertEVP & GM, VSD	Sale	4,568	220.52	$1.01M	15,445	Form 4
2026-03-02	Mora ElizabethDirector	Saleplan	300	239.44	$71,832	18,663	Form 4
2026-02-24	Schreiner James AlanEVP & COO	Sale	4,100	255.00	$1.05M	23,402	Form 4
2026-02-24	Colella Gerald GDirector	Saleindirect	10,000	253.97	$2.54M	40,017	Form 4
2026-02-20	Colella Gerald GDirector	Saleindirect	10,000	252.90	$2.53M	50,017	Form 4
2026-02-20	Lee John Tseng-ChungDirector, President & CEO	Sale	13,310	256.05	$3.41M	171,386	Form 4
2026-02-20	Lee John Tseng-ChungDirector, President & CEO	Sale	12,812	256.93	$3.29M	158,574	Form 4
2026-02-20	Lee John Tseng-ChungDirector, President & CEO	Sale	1,988	257.81	$512,526	156,586	Form 4
2026-02-20	Lee John Tseng-ChungDirector, President & CEO	Sale	1,890	259.70	$490,833	154,696	Form 4
2026-02-20	Burke Kathleen FlahertyEVP, GC & Secretary	Sale	4,254	250.00	$1.06M	53,794	Form 4
2026-02-20	Williams John EdwardEVP & GM, PSD	Sale	2,043	256.41	$523,751	3,640	Form 4
2026-02-20	Moloney Jacqueline FDirector	Sale	829	247.55	$205,219	10,733	Form 4
2026-02-20	McCarthy Michelle MVP & Chief Accounting Officer	Sale	650	249.57	$162,220	816	Form 4

19 more

2026-02-20	McCarthy Michelle MVP & Chief Accounting Officer	Sale	816	250.35	$204,286	0	Form 4
2026-02-20	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Sale	2,000	261.56	$523,120	18,841	Form 4
2026-02-20	Taranto Eric RobertEVP & GM, VSD	Sale	1,453	247.55	$359,623	20,013	Form 4
2026-02-20	Cannone Peter IIIDirector	Sale	1,250	258.06	$322,575	8,362	Form 4
2025-12-02	Mora ElizabethDirector	Saleplan	300	158.81	$47,643	18,963	Form 4
2025-10-22	Schreiner James AlanEVP & COO	Saleplan	711	138.68	$98,601	22,535	Form 4
2025-10-01	Moloney Jacqueline FDirector	Saleplan	300	122.14	$36,642	11,562	Form 4
2025-09-18	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Saleplan	5,000	130.00	$650,000	15,571	Form 4
2025-09-18	Schreiner James AlanEVP & COO	Saleplan	838	124.00	$103,912	23,246	Form 4
2025-09-02	Mora ElizabethDirector	Saleplan	300	99.85	$29,955	19,263	Form 4
2025-08-01	Moloney Jacqueline FDirector	Saleplan	300	92.10	$27,630	11,862	Form 4
2025-07-07	Schreiner James AlanEVP & COO, MSD	Saleplan	957	102.44	$98,035	22,692	Form 4
2025-07-03	Henry David PhilipEVP, Operations & Corp Mktg	Saleplan	2,000	105.00	$210,000	20,571	Form 4
2025-06-02	Mora ElizabethDirector	Saleplan	300	81.78	$24,534	19,563	Form 4
2025-03-03	Moloney Jacqueline FDirector	Saleplan	300	92.46	$27,738	9,683	Form 4
2025-03-03	Mora ElizabethDirector	Saleplan	275	92.46	$25,426	17,384	Form 4
2025-02-18	Colella Gerard GDirector	Saleindirect	8,000	104.53	$836,240	60,017	Form 4
2024-12-10	Moloney Jacqueline FDirector	Saleplan	300	114.80	$34,440	9,983	Form 4
2024-12-02	Mora ElizabethDirector	Saleplan	275	113.41	$31,188	17,659	Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

89 × option exercise23 × shares withheld for tax15 × grant or award

Show them

Date	Insider	What	Shares	Price	Holds after	Filing
2026-05-11	Colella Gerald GDirector	Grant or award A	+782	–	8,999	Form 4
2026-05-11	Batra RajDirector	Grant or award A	+782	–	16,227	Form 4
2026-05-11	Cannone Peter IIIDirector	Grant or award A	+782	–	9,144	Form 4
2026-05-11	Donahue Joseph BDirector	Grant or award A	+782	–	12,133	Form 4
2026-05-11	Mora ElizabethDirector	Grant or award A	+782	–	19,445	Form 4
2026-05-11	Jabre Wissam GDirector	Grant or award A	+782	–	5,270	Form 4
2026-05-11	Moloney Jacqueline FDirector	Grant or award A	+782	–	11,175	Form 4
2026-04-17	Williams John EdwardEVP & GM, PSD	Option exercise M	+1,741	–	5,381	Form 4
2026-04-17	Williams John EdwardEVP & GM, PSD	Shares withheld for tax F	−826	269.89	4,555	Form 4
2026-04-15	McCarthy Michelle MSVP & Chief Accounting Officer	Option exercise M	+968	–	968	Form 4
2026-04-15	McCarthy Michelle MSVP & Chief Accounting Officer	Option exercise M	+1,107	–	2,075	Form 4
2026-04-15	McCarthy Michelle MSVP & Chief Accounting Officer	Option exercise M	+1,736	–	3,811	Form 4
2026-04-15	McCarthy Michelle MSVP & Chief Accounting Officer	Shares withheld for tax F	−1,375	274.15	2,436	Form 4
2026-02-17	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+22,088	–	169,443	Form 4
2026-02-17	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+7,654	–	177,097	Form 4
2026-02-17	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+3,859	–	180,956	Form 4
2026-02-17	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+7,208	–	188,164	Form 4
2026-02-17	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+16,989	–	205,153	Form 4
2026-02-17	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+12,091	–	217,244	Form 4
2026-02-17	Lee John Tseng-ChungDirector, President & CEO	Shares withheld for tax F	−32,548	260.74	184,696	Form 4
2026-02-17	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+3,451	–	54,611	Form 4
2026-02-17	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+1,788	–	56,399	Form 4
2026-02-17	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+563	–	56,961	Form 4
2026-02-17	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+1,576	–	58,537	Form 4
2026-02-17	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+2,336	–	60,873	Form 4
2026-02-17	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+2,493	–	63,366	Form 4
2026-02-17	Burke Kathleen FlahertyEVP, GC & Secretary	Shares withheld for tax F	−5,318	260.74	58,048	Form 4
2026-02-17	Mayampurath RamakumarEVP & CFO	Option exercise M	+2,958	–	8,625	Form 4
2026-02-17	Mayampurath RamakumarEVP & CFO	Option exercise M	+2,702	–	11,327	Form 4
2026-02-17	Mayampurath RamakumarEVP & CFO	Shares withheld for tax F	−2,516	260.74	8,811	Form 4
2026-02-17	Williams John EdwardEVP & GM, PSD	Option exercise M	+300	–	3,940	Form 4
2026-02-17	Williams John EdwardEVP & GM, PSD	Option exercise M	+841	–	4,781	Form 4
2026-02-17	Williams John EdwardEVP & GM, PSD	Option exercise M	+991	–	5,772	Form 4
2026-02-17	Williams John EdwardEVP & GM, PSD	Option exercise M	+1,106	–	6,878	Form 4
2026-02-17	Williams John EdwardEVP & GM, PSD	Shares withheld for tax F	−1,195	260.74	5,683	Form 4
2026-02-17	Schreiner James AlanEVP & COO	Option exercise M	+2,567	–	25,187	Form 4
2026-02-17	Schreiner James AlanEVP & COO	Option exercise M	+1,330	–	26,517	Form 4
2026-02-17	Schreiner James AlanEVP & COO	Option exercise M	+432	–	26,950	Form 4
2026-02-17	Schreiner James AlanEVP & COO	Option exercise M	+1,211	–	28,161	Form 4
2026-02-17	Schreiner James AlanEVP & COO	Option exercise M	+1,741	–	29,902	Form 4
2026-02-17	Schreiner James AlanEVP & COO	Option exercise M	+1,944	–	31,846	Form 4
2026-02-17	Schreiner James AlanEVP & COO	Shares withheld for tax F	−4,344	260.74	27,502	Form 4
2026-02-17	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Option exercise M	+2,406	–	18,062	Form 4
2026-02-17	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Option exercise M	+1,247	–	19,310	Form 4
2026-02-17	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Option exercise M	+456	–	19,766	Form 4
2026-02-17	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Option exercise M	+1,278	–	21,044	Form 4
2026-02-17	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Option exercise M	+1,841	–	22,885	Form 4
2026-02-17	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Option exercise M	+2,054	–	24,939	Form 4
2026-02-17	Henry David PhilipEVP, Global Str Mktg & GM, MSD	Shares withheld for tax F	−4,097	260.74	20,841	Form 4
2026-02-17	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+1,764	–	19,468	Form 4
2026-02-17	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+914	–	20,382	Form 4
2026-02-17	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+348	–	20,731	Form 4
2026-02-17	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+976	–	21,707	Form 4
2026-02-17	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+1,167	–	22,874	Form 4
2026-02-17	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+1,303	–	24,177	Form 4
2026-02-17	Taranto Eric RobertEVP & GM, VSD	Shares withheld for tax F	−2,712	260.74	21,465	Form 4
2025-11-17	Mayampurath RamakumarEVP & CFO	Option exercise M	+8,295	–	8,295	Form 4
2025-11-17	Mayampurath RamakumarEVP & CFO	Shares withheld for tax F	−2,628	142.74	5,667	Form 4
2025-10-31	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+352	–	147,622	Form 4
2025-10-31	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+1,651	–	149,273	Form 4
2025-10-31	Lee John Tseng-ChungDirector, President & CEO	Shares withheld for tax F	−2,003	143.71	147,270	Form 4
2025-10-31	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+158	–	51,233	Form 4
2025-10-31	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+52	–	51,285	Form 4
2025-10-31	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+82	–	51,367	Form 4
2025-10-31	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+144	–	51,511	Form 4
2025-10-31	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+341	–	51,852	Form 4
2025-10-31	Burke Kathleen FlahertyEVP, GC & Secretary	Shares withheld for tax F	−777	143.71	51,075	Form 4
2025-08-18	Schreiner James AlanEVP & COO	Option exercise M	+2,641	–	25,333	Form 4
2025-08-18	Schreiner James AlanEVP & COO	Shares withheld for tax F	−1,249	100.22	24,084	Form 4
2025-08-15	Williams John EdwardEVP & GM, PSD	Option exercise M	+947	–	3,948	Form 4
2025-08-15	Williams John EdwardEVP & GM, PSD	Shares withheld for tax F	−308	104.73	3,640	Form 4
2025-05-12	Colella Gerard GDirector	Grant or award A	+2,479	–	8,217	Form 4
2025-05-12	Batra RajDirector	Grant or award A	+2,479	–	15,445	Form 4
2025-05-12	Cannone Peter IIIDirector	Grant or award A	+2,479	–	9,612	Form 4
2025-05-12	Donahue Joseph BDirector	Grant or award A	+2,479	–	11,351	Form 4
2025-05-12	Jabre Wissam GDirector	Grant or award A	+2,479	–	4,488	Form 4
2025-05-12	Moloney Jacqueline FDirector	Grant or award A	+2,479	–	12,162	Form 4
2025-05-12	Mora ElizabethDirector	Grant or award A	+2,479	–	19,863	Form 4
2025-04-17	Williams John EdwardEVP & GM, PSD	Option exercise M	+1,740	–	3,566	Form 4
2025-04-17	Williams John EdwardEVP & GM, PSD	Shares withheld for tax F	−565	63.69	3,001	Form 4
2025-04-15	McCarthy Michelle MVP & Chief Accounting Officer	Option exercise M	+968	–	968	Form 4
2025-04-15	McCarthy Michelle MVP & Chief Accounting Officer	Option exercise M	+1,106	–	2,074	Form 4
2025-04-15	McCarthy Michelle MVP & Chief Accounting Officer	Shares withheld for tax F	−608	68.48	1,466	Form 4
2025-02-18	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+14,041	–	126,730	Form 4
2025-02-18	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+6,735	–	133,465	Form 4
2025-02-18	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+22,088	–	155,553	Form 4
2025-02-18	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+7,654	–	163,207	Form 4
2025-02-18	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+4,035	–	167,242	Form 4
2025-02-18	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+7,207	–	174,449	Form 4
2025-02-18	Lee John Tseng-ChungDirector, President & CEO	Shares withheld for tax F	−27,332	103.67	147,117	Form 4
2025-02-18	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+2,287	–	45,533	Form 4
2025-02-18	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+1,645	–	47,178	Form 4
2025-02-18	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+3,608	–	50,786	Form 4
2025-02-18	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+1,870	–	52,656	Form 4
2025-02-18	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+588	–	53,244	Form 4
2025-02-18	Burke Kathleen FlahertyEVP, GC & Secretary	Option exercise M	+1,648	–	54,892	Form 4
2025-02-18	Burke Kathleen FlahertyEVP, GC & Secretary	Shares withheld for tax F	−3,970	103.67	50,922	Form 4
2025-02-18	Henry David PhilipEVP, Operations & Corp Mktg	Option exercise M	+1,528	–	18,306	Form 4
2025-02-18	Henry David PhilipEVP, Operations & Corp Mktg	Option exercise M	+1,099	–	19,405	Form 4
2025-02-18	Henry David PhilipEVP, Operations & Corp Mktg	Option exercise M	+2,406	–	21,811	Form 4
2025-02-18	Henry David PhilipEVP, Operations & Corp Mktg	Option exercise M	+1,246	–	23,057	Form 4
2025-02-18	Henry David PhilipEVP, Operations & Corp Mktg	Option exercise M	+456	–	23,513	Form 4
2025-02-18	Henry David PhilipEVP, Operations & Corp Mktg	Option exercise M	+1,278	–	24,791	Form 4
2025-02-18	Henry David PhilipEVP, Operations & Corp Mktg	Shares withheld for tax F	−2,372	103.67	22,419	Form 4
2025-02-18	Schreiner James AlanEVP & COO, MSD	Option exercise M	+1,630	–	20,434	Form 4
2025-02-18	Schreiner James AlanEVP & COO, MSD	Option exercise M	+1,173	–	21,607	Form 4
2025-02-18	Schreiner James AlanEVP & COO, MSD	Option exercise M	+2,566	–	24,173	Form 4
2025-02-18	Schreiner James AlanEVP & COO, MSD	Option exercise M	+1,329	–	25,502	Form 4
2025-02-18	Schreiner James AlanEVP & COO, MSD	Option exercise M	+432	–	25,934	Form 4
2025-02-18	Schreiner James AlanEVP & COO, MSD	Option exercise M	+1,211	–	27,145	Form 4
2025-02-18	Schreiner James AlanEVP & COO, MSD	Shares withheld for tax F	−3,648	103.67	23,497	Form 4
2025-02-18	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+1,119	–	14,421	Form 4
2025-02-18	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+805	–	15,226	Form 4
2025-02-18	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+1,764	–	16,990	Form 4
2025-02-18	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+914	–	17,904	Form 4
2025-02-18	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+348	–	18,252	Form 4
2025-02-18	Taranto Eric RobertEVP & GM, VSD	Option exercise M	+975	–	19,227	Form 4
2025-02-18	Taranto Eric RobertEVP & GM, VSD	Shares withheld for tax F	−1,760	103.67	17,467	Form 4
2025-02-18	Williams John EdwardEVP & GM, PSD	Option exercise M	+915	–	928	Form 4
2025-02-18	Williams John EdwardEVP & GM, PSD	Option exercise M	+658	–	1,586	Form 4
2025-02-18	Williams John EdwardEVP & GM, PSD	Option exercise M	+300	–	1,886	Form 4
2025-02-18	Williams John EdwardEVP & GM, PSD	Option exercise M	+841	–	2,727	Form 4
2025-02-18	Williams John EdwardEVP & GM, PSD	Shares withheld for tax F	−901	103.67	1,826	Form 4
2024-12-06	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+2,010	–	114,699	Form 4
2024-12-06	Lee John Tseng-ChungDirector, President & CEO	Option exercise M	+984	–	115,683	Form 4
2024-12-06	Lee John Tseng-ChungDirector, President & CEO	Shares withheld for tax F	−2,994	114.60	112,689	Form 4
2024-11-04	Jabre Wissam GDirector	Grant or award A	+2,009	–	2,009	Form 4

How to read it

Buy, sale: Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan: A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after: The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value: Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

MKS Instruments's scores and multiples ›