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MKS INC

MKSI Net selling
CIK 0001049502 #712 in the set updated 17 Sep 2026
Bought (120 mo)
$318.39K
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$434.33M
$22.91M on a plan · $484.17K straight out of an exercise
Sold at will
$410.94M
148 of 197 sales
Net
−$434.02M
−$410.62M against sales at will

By person

32 insiders · 200 transactions
32.5×

John T.C. Lee holds 32.5 times base salary in stock. $33.82M of shares against $1.04M in salary for 2025.

Salary from the company's own proxy. The shares are what John T.C. Lee last reported holding, valued at $250.96, the price Common Stock was last bought or sold at on the open market here, on 1 Sep 2026.

Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
Carlyle Group Inc. entity
10% owner
—
$172.25M (1)
−$172.25M
6,482,732
9.59%
$1.63B
−23.6%
Carlyle Partners VI Cayman Holdings, L.P. entity
10% owner
—
$172.25M (1)
−$172.25M
6,482,732
9.59%
$1.63B
−23.6%
COLELLA GERALD G
Director
$117.51K (1)
$23.30M (26)
−$23.18M
29,016
0.0429%
$7.28M
−22.0%
Lee John Tseng-Chung
President & CEO
—
$16.65M (10)
−$16.65M
134,776
0.1993%
$33.82M
+4,955%
BAGSHAW SETH H
EVP, CFO & Treasurer
—
$15.03M (22)
−$15.03M
1
<0.0001%
$197.76
−100.0%
Burke Kathleen Flaherty
EVP, GC & Secretary
—
$5.69M (6)
−$5.69M
49,439
0.0731%
$12.41M
+21.6%
Henry David Philip
EVP, Global Str Mktg & GM, MSD
$170.86K (1)
$4.15M (6)
−$3.98M
10,422
0.0154%
$2.62M
+463.2%
Beecher Gregory R
Director
—
$3.51M (3)
−$3.51M
1,981
0.0029%
$497.06K
−95.2%
Schreiner James Alan
EVP & COO
—
$2.80M (8)
−$2.80M
19,201
0.0284%
$4.82M
+1,535%
Mayampurath Ramakumar
EVP & CFO
—
$2.78M (1) scheduled
−$2.78M
1
<0.0001%
$285.84
—
Taranto Eric Robert
EVP & GM, VSD
—
$2.61M (4)
−$2.61M
12,596
0.0186%
$3.16M
+166.2%
Abrams John R
Sr. VP, Global Sales
—
$1.97M (4)
−$1.97M
6,864
0.0102%
$1.72M
+17.0%
Moloney Jacqueline F
Director
—
$1.79M (23)
−$1.79M
8,775
0.0130%
$2.20M
+129.0%
Mora Elizabeth
Director
—
$1.67M (43)
−$1.67M
18,845
0.0279%
$4.73M
+22.6%
Quirk Brian Charles
Sr. VP, Global Operations
—
$1.21M (9)
−$1.21M
17,641
0.0261%
$4.43M
+40.9%
McCarthy Michelle M
SVP & Chief Accounting Officer
—
$1.13M (3) scheduled
−$1.13M
2
<0.0001%
$388.74
—
PHILLIPPY ROBERT J
Director
—
$1.09M (1)
−$1.09M
12,632
0.0187%
$3.17M
−38.8%
Williams John Edward
EVP & GM, PSD
—
$869.18K (3)
−$869.18K
4,098
0.0061%
$1.03M
+249.0%
CANNONE PETER III
Director
$30.01K (1)
$732.16K (2)
−$702.15K
7,794
0.0115%
$1.96M
—
Donahue Joseph B
Director
—
$688.70K (1)
−$688.70K
10,033
0.0148%
$2.52M
—
CHUTE RICHARD S
Director
—
$589.13K (3)
−$589.13K
6,616
0.0098%
$1.66M
−31.2%
HANLEY PETER
Director
—
$551.25K (11)
−$551.25K
1,501
0.0022%
$376.75K
−60.8%
Werth Dennis L
Sr. VP, Business Units
—
$484.17K (3) scheduled
−$484.17K
9,239
0.0137%
$2.32M
—
ANDERSON ROBERT R
Director
—
$309.42K (2)
−$309.42K
29,424
0.0435%
$7.38M
−24.4%
Gitin Mark Milton
EVP & GM, PSD
—
$236.51K (1)
−$236.51K
16,134
0.0239%
$4.05M
+230.7%
BERTUCCI JOHN R
Director
—
—
—
67,275
0.0995%
$16.88M
−76.7%
Batra Raj
Director
—
—
—
16,227
0.0240%
$4.07M
—
Warner Michelle M
Director
—
—
—
10,852
0.0160%
$2.72M
—
Hess Rick D
Director
—
—
—
5,468
0.0081%
$1.37M
—
JABRE WISSAM G
Director
—
—
—
5,270
0.0078%
$1.32M
—
HENRY JANICE K
Director
—
—
—
1,989
0.0029%
$499.08K
—
WILD GEOFFREY
Director
—
—
—
1,813
0.0027%
$455.05K
—

Individual transactions

148
Insider
Date
Role
Action
Shares
Price
Amount
Schreiner James Alan
12 Jun 2026
EVP & COO
Sell
217
$347.00
$75.30K
Schreiner James Alan
12 Jun 2026
EVP & COO
Sell
812
$346.41
$281.28K
Schreiner James Alan
12 Jun 2026
EVP & COO
Sell
2,471
$345.52
$853.79K
Henry David Philip
1 Jun 2026
EVP, Global Str Mktg & GM, MSD
Sell
6,000
$314.43
$1.89M
Donahue Joseph B
27 May 2026
Director
Sell
2,100
$327.95
$688.70K
CANNONE PETER III
18 May 2026
Director
Sell
1,350
$303.40
$409.59K
Moloney Jacqueline F
14 May 2026
Director
Sell
1,000
$312.20
$312.20K
Moloney Jacqueline F
13 May 2026
Director
Sell
1,400
$318.99
$446.59K
Burke Kathleen Flaherty
11 May 2026
EVP, GC & Secretary
Sell
4,355
$319.94
$1.39M
Taranto Eric Robert
11 May 2026
EVP & GM, VSD
Sell
2,849
$319.93
$911.33K
Moloney Jacqueline F
12 Mar 2026
Director
Sell
340
$213.77
$72.71K
Taranto Eric Robert
6 Mar 2026
EVP & GM, VSD
Sell
4,568
$220.52
$1.01M
COLELLA GERALD G
24 Feb 2026
Director
Sell indirect
10,000
$253.97
$2.54M
Schreiner James Alan
24 Feb 2026
EVP & COO
Sell
4,100
$255.00
$1.05M
Lee John Tseng-Chung
20 Feb 2026
President & CEO
Sell
1,890
$259.70
$490.84K
Lee John Tseng-Chung
20 Feb 2026
President & CEO
Sell
1,988
$257.81
$512.52K
Lee John Tseng-Chung
20 Feb 2026
President & CEO
Sell
12,812
$256.93
$3.29M
Lee John Tseng-Chung
20 Feb 2026
President & CEO
Sell
13,310
$256.05
$3.41M
Burke Kathleen Flaherty
20 Feb 2026
EVP, GC & Secretary
Sell
4,254
$250.00
$1.06M
Williams John Edward
20 Feb 2026
EVP & GM, PSD
Sell
2,043
$256.41
$523.74K
Moloney Jacqueline F
20 Feb 2026
Director
Sell
829
$247.55
$205.22K
McCarthy Michelle M
20 Feb 2026
VP & Chief Accounting Officer
Sell
816
$250.35
$204.28K
McCarthy Michelle M
20 Feb 2026
VP & Chief Accounting Officer
Sell
650
$249.57
$162.22K
Henry David Philip
20 Feb 2026
EVP, Global Str Mktg & GM, MSD
Sell
2,000
$261.56
$523.12K
Taranto Eric Robert
20 Feb 2026
EVP & GM, VSD
Sell
1,453
$247.55
$359.62K
CANNONE PETER III
20 Feb 2026
Director
Sell
1,250
$258.06
$322.57K
COLELLA GERALD G
20 Feb 2026
Director
Sell indirect
10,000
$252.90
$2.53M
COLELLA GERALD G
18 Feb 2025
Director
Sell indirect
8,000
$104.53
$836.22K
Williams John Edward
16 Aug 2024
EVP & GM, PSD
Sell
1,800
$118.71
$213.68K
Burke Kathleen Flaherty
1 Mar 2024
EVP, GC & Secretary
Sell
7,411
$122.89
$910.74K
BAGSHAW SETH H
22 Feb 2024
EVP, CFO & Treasurer
Sell
1,000
$124.56
$124.56K
BAGSHAW SETH H
22 Feb 2024
EVP, CFO & Treasurer
Sell
11,612
$124.02
$1.44M
BAGSHAW SETH H
22 Feb 2024
EVP, CFO & Treasurer
Sell
20,253
$122.79
$2.49M
Moloney Jacqueline F
16 Feb 2024
Director
Sell
1,917
$124.10
$237.93K
BAGSHAW SETH H
6 Sep 2023
EVP, CFO & Treasurer
Sell
7,073
$97.66
$690.77K
BAGSHAW SETH H
6 Sep 2023
EVP, CFO & Treasurer
Sell
17,927
$97.16
$1.74M
Moloney Jacqueline F
28 Aug 2023
Director
Sell
250
$95.26
$23.81K
Burke Kathleen Flaherty
7 Aug 2023
EVP, GC & Secretary
Sell
5,377
$101.40
$545.24K
Burke Kathleen Flaherty
7 Aug 2023
EVP, GC & Secretary
Sell
6,186
$101.08
$625.30K
Carlyle Group Inc.
8 May 2023
10% owner
Sell indirect
2,000,000
$86.13
$172.25M
Carlyle Partners VI Cayman Holdings, L.P.
8 May 2023
10% owner
Sell indirect
2,000,000
$86.13
$172.25M
Moloney Jacqueline F
15 Mar 2023
Director
Sell
225
$86.67
$19.50K
Mora Elizabeth
15 Mar 2023
Director
Sell
200
$86.67
$17.33K
Moloney Jacqueline F
1 Dec 2022
Director
Sell
225
$83.86
$18.87K
Mora Elizabeth
1 Dec 2022
Director
Sell
200
$83.86
$16.77K
Moloney Jacqueline F
3 Oct 2022
Director
Sell
225
$84.14
$18.93K
Mora Elizabeth
1 Sep 2022
Director
Sell
200
$96.72
$19.34K
Mora Elizabeth
1 Mar 2022
Director
Sell
300
$149.99
$45.00K
Mora Elizabeth
1 Dec 2021
Director
Sell
300
$155.91
$46.77K
COLELLA GERALD G
4 Nov 2021
Director
Sell indirect
3,000
$155.16
$465.49K
Mora Elizabeth
1 Sep 2021
Director
Sell
300
$148.10
$44.43K
Mora Elizabeth
1 Jun 2021
Director
Sell
300
$190.00
$57.00K
Henry David Philip
20 May 2021
SVP, Corp Mkt, PMO & Glob Svc
Sell
284
$186.70
$53.02K
Gitin Mark Milton
30 Apr 2021
SVP & GM, L&M Division
Sell
1,301
$181.79
$236.51K
Taranto Eric Robert
29 Apr 2021
SVP & GM, V&A Division
Sell
1,788
$185.29
$331.30K
BAGSHAW SETH H
15 Apr 2021
Sr. VP, CFO & Treasurer
Sell
200
$188.40
$37.68K
BAGSHAW SETH H
15 Apr 2021
Sr. VP, CFO & Treasurer
Sell
4,955
$187.78
$930.45K
BAGSHAW SETH H
15 Apr 2021
Sr. VP, CFO & Treasurer
Sell
1,741
$186.65
$324.96K
BAGSHAW SETH H
15 Apr 2021
Sr. VP, CFO & Treasurer
Sell
704
$185.39
$130.51K
BAGSHAW SETH H
15 Apr 2021
Sr. VP, CFO & Treasurer
Sell
1,400
$184.36
$258.11K
Mora Elizabeth
1 Mar 2021
Director
Sell
450
$168.00
$75.60K
Mora Elizabeth
1 Dec 2020
Director
Sell
450
$139.54
$62.79K
Mora Elizabeth
1 Sep 2020
Director
Sell
450
$120.28
$54.13K
COLELLA GERALD G
3 Aug 2020
Director
Sell indirect
6,000
$128.37
$770.24K
BAGSHAW SETH H
23 Jul 2020
Sr. VP, CFO & Treasurer
Sell
1,440
$126.07
$181.54K
BAGSHAW SETH H
23 Jul 2020
Sr. VP, CFO & Treasurer
Sell
1,493
$125.09
$186.76K
BAGSHAW SETH H
23 Jul 2020
Sr. VP, CFO & Treasurer
Sell
2,062
$123.57
$254.80K
BAGSHAW SETH H
22 Jul 2020
Sr. VP, CFO & Treasurer
Sell
5
$123.00
$615.00
BAGSHAW SETH H
6 Jul 2020
Sr. VP, CFO & Treasurer
Sell
5,000
$116.84
$584.20K
Mora Elizabeth
1 Jun 2020
Director
Sell
450
$105.09
$47.29K
COLELLA GERALD G
19 May 2020
Director
Sell indirect
5,000
$100.17
$500.86K
Mora Elizabeth
5 May 2020
Director
Sell
1,005
$96.77
$97.25K
Beecher Gregory R
5 May 2020
Director
Sell
18,143
$95.95
$1.74M
COLELLA GERALD G
1 May 2020
Director
Sell indirect
5,000
$96.55
$482.75K
Moloney Jacqueline F
16 Mar 2020
Director
Sell
107
$81.47
$8.72K
Moloney Jacqueline F
16 Mar 2020
Director
Sell
200
$81.44
$16.29K
Mora Elizabeth
2 Mar 2020
Director
Sell
400
$100.68
$40.27K
COLELLA GERALD G
4 Feb 2020
Director
Sell indirect
7,000
$113.05
$791.35K
Mora Elizabeth
2 Dec 2019
Director
Sell
400
$106.92
$42.77K
Burke Kathleen Flaherty
30 Oct 2019
Sr. VP, GC & Secretary
Sell
10,384
$110.55
$1.15M
BAGSHAW SETH H
29 Oct 2019
Sr. VP, CFO & Treasurer
Sell
18,000
$112.08
$2.02M
COLELLA GERALD G
28 Oct 2019
CEO, Director
Sell indirect
5,000
$111.03
$555.15K
Mora Elizabeth
3 Sep 2019
Director
Sell
400
$77.00
$30.80K
Moloney Jacqueline F
2 Aug 2019
Director
Sell
603
$81.98
$49.43K
COLELLA GERALD G
11 Jun 2019
CEO, Director
Sell indirect
5,000
$75.82
$379.09K
Mora Elizabeth
3 Jun 2019
Director
Sell
400
$71.93
$28.77K
CHUTE RICHARD S
8 May 2019
Director
Sell
1,499
$86.03
$128.96K
Moloney Jacqueline F
8 May 2019
Director
Sell
256
$85.86
$21.98K
Mora Elizabeth
1 Mar 2019
Director
Sell
375
$83.90
$31.46K
Mora Elizabeth
3 Dec 2018
Director
Sell
375
$79.90
$29.96K
Mora Elizabeth
4 Sep 2018
Director
Sell
375
$92.50
$34.69K
HANLEY PETER
7 Aug 2018
Director
Sell
1,240
$94.39
$117.04K
Moloney Jacqueline F
11 Jun 2018
Director
Sell
750
$100.20
$75.15K
HANLEY PETER
6 Jun 2018
Director
Sell
500
$117.99
$59.00K
Abrams John R
6 Jun 2018
Sr. VP, Global Sales
Sell
133
$117.77
$15.66K
Mora Elizabeth
1 Jun 2018
Director
Sell
375
$113.40
$42.53K
Mora Elizabeth
16 May 2018
Director
Sell
516
$116.42
$60.07K
HANLEY PETER
11 May 2018
Director
Sell
250
$113.70
$28.43K
CHUTE RICHARD S
9 May 2018
Director
Sell
1,988
$110.75
$220.17K
Quirk Brian Charles
7 May 2018
Sr. VP, Global Operations
Sell
2,000
$109.40
$218.80K
COLELLA GERALD G
1 May 2018
CEO, President, Director
Sell indirect
10,000
$101.92
$1.02M
HANLEY PETER
14 Mar 2018
Director
Sell
430
$123.40
$53.06K
Mora Elizabeth
1 Mar 2018
Director
Sell
300
$111.10
$33.33K
Abrams John R
21 Feb 2018
Sr. VP, Global Sales & Service
Sell
9,831
$114.94
$1.13M
HANLEY PETER
20 Feb 2018
Director
Sell
350
$115.10
$40.29K
BAGSHAW SETH H
20 Feb 2018
Sr. VP, CFO & Treasurer
Sell
5,000
$115.21
$576.07K
Lee John Tseng-Chung
20 Feb 2018
Sr. VP & COO
Sell
1,600
$115.91
$185.46K
Lee John Tseng-Chung
20 Feb 2018
Sr. VP & COO
Sell
11,832
$115.31
$1.36M
PHILLIPPY ROBERT J
15 Feb 2018
Director
Sell indirect
10,000
$109.15
$1.09M
HANLEY PETER
14 Feb 2018
Director
Sell
100
$107.06
$10.71K
Quirk Brian Charles
5 Feb 2018
Sr. VP, Global Operations
Sell
2,000
$105.10
$210.20K
COLELLA GERALD G
12 Jan 2018
CEO, President, Director
Sell indirect
10,000
$96.30
$963.02K
BAGSHAW SETH H
8 Jan 2018
Sr. VP, CFO & Treasurer
Sell
10,000
$102.07
$1.02M
COLELLA GERALD G
14 Dec 2017
CEO, President, Director
Sell indirect
5,000
$95.26
$476.30K
HANLEY PETER
5 Dec 2017
Director
Sell
200
$92.58
$18.52K
Mora Elizabeth
1 Dec 2017
Director
Sell
300
$94.10
$28.23K
Lee John Tseng-Chung
13 Nov 2017
Sr. VP & COO
Sell
2,113
$104.02
$219.78K
Quirk Brian Charles
6 Nov 2017
Sr. VP, Global Operations
Sell
2,000
$107.90
$215.80K
BAGSHAW SETH H
13 Sep 2017
Sr. VP, CFO & Treasurer
Sell
7,500
$85.80
$643.49K
HANLEY PETER
6 Sep 2017
Director
Sell
300
$83.15
$24.95K
Mora Elizabeth
1 Sep 2017
Director
Sell
300
$82.80
$24.84K
Quirk Brian Charles
8 Aug 2017
Sr. VP, Global Operations
Sell
2,000
$79.30
$158.60K
HANLEY PETER
28 Jul 2017
Director
Sell
1,000
$83.22
$83.22K
HANLEY PETER
15 Jun 2017
Director
Sell
250
$72.95
$18.24K
Mora Elizabeth
1 Jun 2017
Director
Sell
300
$81.90
$24.57K
COLELLA GERALD G
19 May 2017
CEO, President, Director
Sell indirect
2,500
$79.30
$198.26K
HANLEY PETER
15 May 2017
Director
Sell
1,200
$81.51
$97.81K
Quirk Brian Charles
10 May 2017
Sr. VP, Global Operations
Sell
2,000
$80.00
$160.00K
CHUTE RICHARD S
10 May 2017
Director
Sell
3,000
$80.00
$240.00K
Beecher Gregory R
4 May 2017
Director
Sell
3,960
$80.87
$320.25K
Mora Elizabeth
3 May 2017
Director
Sell
200
$80.00
$16.00K
Beecher Gregory R
1 May 2017
Director
Sell
18,400
$78.58
$1.45M
COLELLA GERALD G
3 Apr 2017
CEO, President, Director
Sell
10,000
$68.61
$686.06K
Quirk Brian Charles
3 Apr 2017
Sr. VP, Global Operations
Sell
1,000
$68.75
$68.75K
BAGSHAW SETH H
15 Mar 2017
Vice President, CFO, Treasurer
Sell
5,000
$68.27
$341.35K
Abrams John R
14 Mar 2017
Sr. VP, Global Sales & Service
Sell
12,066
$67.09
$809.54K
ANDERSON ROBERT R
13 Mar 2017
Director
Sell indirect
2,500
$67.01
$167.52K
BAGSHAW SETH H
27 Feb 2017
Vice President, CFO, Treasurer
Sell
7,500
$67.00
$502.50K
Lee John Tseng-Chung
22 Feb 2017
Sr. VP & COO
Sell
14,734
$67.99
$1.00M
Quirk Brian Charles
1 Feb 2017
Sr. VP, Global Operations
Sell
1,000
$66.60
$66.60K
Mora Elizabeth
1 Feb 2017
Director
Sell
200
$66.60
$13.32K
Abrams John R
2 Dec 2016
Sr. VP, Global Sales & Service
Sell
302
$54.05
$16.32K
Quirk Brian Charles
1 Dec 2016
Sr. VP, Global Operations
Sell
1,000
$57.40
$57.40K
ANDERSON ROBERT R
22 Nov 2016
Director
Sell
2,500
$56.76
$141.90K
COLELLA GERALD G
16 Nov 2016
CEO, President, Director
Sell
2,500
$55.86
$139.65K
BAGSHAW SETH H
16 Nov 2016
Vice President, CFO, Treasurer
Sell
10,000
$55.45
$554.50K
Mora Elizabeth
1 Nov 2016
Director
Sell
200
$50.50
$10.10K
Quirk Brian Charles
3 Oct 2016
Sr. VP, Global Operations
Sell
1,000
$49.36
$49.36K
Show all 200 transactions →

What was left out

Form 4 filings counted 445
Amendments (4/A) skipped 1
Filings about a different issuer 0
Unreadable filings 0
Joint filings 2
Sales on a Rule 10b5-1 plan 46
Sales straight out of an exercise 3
Sales at will 148
Transactions with no price 0
Shares from compensation/vesting 2,113,362
Sales filed before the plan box existed 107
History held since 14 Sep 2016