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Detailed Insider History for:
MKS INC: MKSI
Price: 2/20/26 52-Wk
High		 52-Wk
Low		 Mkt Cap (mm) Shrs Out (mm) 3-Mth Ave
Vol (m)		 Ind. Yield Short Int
% Float		 Inst. Owned Insider Owned
$259.27 $266.08 $54.84 $17,415 67 1,202 0.4% 5.6% 106.60% 0.58%
Exch Sector Industry Sub-Industry
NasdaqGS Manufacturing Measuring, Analyzing, And Controlling Instruments; Photographic, Medical And Optical Goods; Watches And Clocks Industrial Instruments For Measurement, Display,and Control
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Insider Statistics
T N H M S
Filer Name
Insider Title
Trans Type
Dollar Value
Shares Traded
Trans Date From
Trans Date To
Trans Price From
Trans Price To
Total Holdings
Delta % Owned
Owned
Other Info
Input Date
1
1y
61
41%
14%
2
COLELLA GERALD G
DIR
S
$5,068,674
20,000
2/20/26
2/24/26
$252.90
$253.97
40,017
-33.3
I
---
2/24/26 - 2:26:45 pm
2
1w
1
0%
0%
2
CANNONE PETER III
DIR
S
$322,575
1,250
---
2/20/26
---
$258.06
8,362
-13.0
D
---
2/23/26 - 2:48:46 pm
3
    
 
TARANTO ERIC ROBERT
VP
S
$359,623
1,453
---
2/20/26
---
$247.55
20,013
-6.8
D
---
2/23/26 - 2:39:57 pm
4
    
 
HENRY DAVID PHILIP
VP,SO
S
$523,120
2,000
---
2/20/26
---
$261.56
18,841
-9.6
D
---
2/23/26 - 2:38:23 pm
5
1w
1
0%
0%
2
MCCARTHY MICHELLE M
VP,CAO
S
$366,503
1,466
---
2/20/26
$249.57
$250.35
---
All
D
---
2/23/26 - 2:36:47 pm
6
1y
14
36%
24%
2
MOLONEY JACQUELINE F
DIR
S
$205,219
829
---
2/20/26
---
$247.55
10,733
-7.2
D
---
2/23/26 - 2:32:15 pm
7
1y
1
100%
-16%
2
WILLIAMS JOHN EDWARD
VP
S
$523,744
2,043
---
2/20/26
---
$256.41
3,640
-35.9
D
---
2/23/26 - 2:30:07 pm
8
1y
3
33%
-7%
1
BURKE KATHLEEN FLAHERTY
VP,GC,SEC
S
$1,063,500
4,254
---
2/20/26
---
$250.00
53,794
-7.3
D
---
2/23/26 - 2:28:00 pm
9
1y
22
41%
25%
1
LEE JOHN TSENG CHUNG
PR,CEO,DIR
S
$7,703,242
30,000
---
2/20/26
$256.05
$259.70
154,696
-16.2
D
---
2/23/26 - 2:25:50 pm
10
    
 
TARANTO ERIC ROBERT
VP
JS
$707,066
2,712
---
2/17/26
---
$260.74
21,465
-11.2
D
R
2/18/26 - 5:07:34 pm
11
    
 
TARANTO ERIC ROBERT
VP
JB
---
6,473
---
2/17/26
---
---
24,177
36.6
D
R
2/18/26 - 5:07:34 pm
12
    
 
HENRY DAVID PHILIP
VP,SO
JS
$1,068,322
4,097
---
2/17/26
---
$260.74
20,841
-16.4
D
R
2/18/26 - 5:05:02 pm
13
    
 
HENRY DAVID PHILIP
VP,SO
JB
---
9,282
---
2/17/26
---
---
24,939
59.3
D
R
2/18/26 - 5:05:02 pm
14
    
 
SCHREINER JAMES ALAN
VP,COO
JS
$1,132,593
4,344
---
2/17/26
---
$260.74
27,502
-13.6
D
R
2/18/26 - 5:02:56 pm
15
    
 
SCHREINER JAMES ALAN
VP,COO
JB
---
9,225
---
2/17/26
---
---
31,846
40.8
D
R
2/18/26 - 5:02:56 pm
16
    
 
WILLIAMS JOHN EDWARD
VP
JS
$311,711
1,195
---
2/17/26
---
$260.74
5,683
-17.4
D
R
2/18/26 - 5:00:53 pm
17
    
 
WILLIAMS JOHN EDWARD
VP
JB
---
3,238
---
2/17/26
---
---
6,878
89.0
D
R
2/18/26 - 5:00:53 pm
18
    
 
MAYAMPURATH RAMAKUMAR
VP,CFO
JS
$656,006
2,516
---
2/17/26
---
$260.74
8,811
-22.2
D
R
2/18/26 - 4:58:25 pm
19
    
 
MAYAMPURATH RAMAKUMAR
VP,CFO
JB
---
5,660
---
2/17/26
---
---
11,327
99.9
D
R
2/18/26 - 4:58:25 pm
20
    
 
BURKE KATHLEEN FLAHERTY
VP,GC,SEC
JS
$1,386,563
5,318
---
2/17/26
---
$260.74
58,048
-8.4
D
R
2/18/26 - 4:55:50 pm
21
    
 
BURKE KATHLEEN FLAHERTY
VP,GC,SEC
JB
---
12,206
---
2/17/26
---
---
63,366
23.9
D
R
2/18/26 - 4:55:50 pm
22
    
 
LEE JOHN TSENG CHUNG
PR,CEO,DIR
JS
$8,486,646
32,548
---
2/17/26
---
$260.74
184,696
-15.0
D
R
2/18/26 - 4:52:34 pm
23
    
 
LEE JOHN TSENG CHUNG
PR,CEO,DIR
JB
---
69,889
---
2/17/26
---
---
217,244
47.4
D
R
2/18/26 - 4:52:34 pm
24
1y
40
30%
17%
1
MORA ELIZABETH
DIR
AS
$47,643
300
---
12/2/25
---
$158.81
18,963
-1.6
D
10b
12/3/25 - 11:39:55 am
25
    
 
MAYAMPURATH RAMAKUMAR
VP,CFO
JS
$375,121
2,628
---
11/17/25
---
$142.74
5,667
-31.7
D
R
11/18/25 - 2:32:57 pm
26
    
 
MAYAMPURATH RAMAKUMAR
VP,CFO
JB
---
8,295
---
11/17/25
---
---
8,295
New
D
R
11/18/25 - 2:32:57 pm
27
    
 
BURKE KATHLEEN FLAHERTY
VP,GC,SEC
JS
$111,663
777
---
10/31/25
---
$143.71
51,075
-1.5
D
R
11/4/25 - 5:01:43 pm
28
    
 
BURKE KATHLEEN FLAHERTY
VP,GC,SEC
JB
---
777
---
10/31/25
---
---
51,852
1.5
D
R
11/4/25 - 5:01:43 pm
29
    
 
LEE JOHN TSENG CHUNG
PR,CEO,DIR
JS
$287,851
2,003
---
10/31/25
---
$143.71
147,270
-1.3
D
R
11/4/25 - 4:58:14 pm
30
    
 
LEE JOHN TSENG CHUNG
PR,CEO,DIR
JB
---
2,003
---
10/31/25
---
---
149,273
1.4
D
R
11/4/25 - 4:58:14 pm
31
    
 
SCHREINER JAMES ALAN
VP,COO
AS
$98,601
711
---
10/22/25
---
$138.68
22,535
-3.1
D
10b
10/23/25 - 2:43:49 pm
32
1y
14
36%
24%
2
MOLONEY JACQUELINE F
DIR
AS
$36,642
300
---
10/1/25
---
$122.14
11,562
-2.5
D
10b
10/2/25 - 2:00:39 pm
33
    
 
SCHREINER JAMES ALAN
VP,COO
AS
$103,912
838
---
9/18/25
---
$124.00
23,246
-3.5
D
10b
9/19/25 - 2:21:39 pm
34
    
 
HENRY DAVID PHILIP
VP,SO
AS
$650,000
5,000
---
9/18/25
---
$130.00
15,571
-24.3
D
10b
9/19/25 - 2:18:31 pm
35
1y
40
30%
17%
1
MORA ELIZABETH
DIR
AS
$29,955
300
---
9/2/25
---
$99.85
19,263
-1.5
D
10b
9/3/25 - 1:40:39 pm
36
    
 
SCHREINER JAMES ALAN
VP,COO
JS
$125,175
1,249
---
8/18/25
---
$100.22
24,084
-4.9
D
R
8/19/25 - 1:05:57 pm
37
    
 
SCHREINER JAMES ALAN
VP,COO
JB
---
2,641
---
8/18/25
---
---
25,333
11.6
D
R
8/19/25 - 1:05:57 pm
38
    
 
WILLIAMS JOHN EDWARD
VP
JS
$32,257
308
---
8/15/25
---
$104.73
3,640
-7.8
D
R
8/18/25 - 1:49:29 pm
39
    
 
WILLIAMS JOHN EDWARD
VP
JB
---
947
---
8/15/25
---
---
3,948
31.6
D
R
8/18/25 - 1:49:29 pm
40
1y
14
36%
24%
2
MOLONEY JACQUELINE F
DIR
AS
$27,630
300
---
8/1/25
---
$92.10
11,862
-2.5
D
10b
8/4/25 - 11:30:05 am
41
    
 
SCHREINER JAMES ALAN
VP,COO
AS
$98,035
957
---
7/7/25
---
$102.44
22,692
-4.0
D
10b
7/8/25 - 4:45:48 pm
42
    
 
HENRY DAVID PHILIP
VP,OO,SO
AS
$210,000
2,000
---
7/3/25
---
$105.00
20,571
-8.9
D
10b
7/7/25 - 4:07:28 pm
43
1y
40
30%
17%
1
MORA ELIZABETH
DIR
S
$24,534
300
---
6/2/25
---
$81.78
19,563
-1.5
D
10b
6/3/25 - 2:53:18 pm
44
    
 
MORA ELIZABETH
DIR
JB
---
2,479
---
5/12/25
---
---
19,863
14.3
D
R
5/13/25 - 4:50:29 pm
45
    
 
MOLONEY JACQUELINE F
DIR
JB
---
2,479
---
5/12/25
---
---
12,162
25.6
D
R
5/13/25 - 4:48:13 pm
46
    
 
JABRE WISSAM G
DIR
JB
---
2,479
---
5/12/25
---
---
4,488
123.4
D
R
5/13/25 - 4:44:52 pm
47
    
 
DONAHUE JOSEPH B
DIR
JB
---
2,479
---
5/12/25
---
---
11,351
27.9
D
R
5/13/25 - 4:41:35 pm
48
    
 
CANNONE PETER III
DIR
JB
---
2,479
---
5/12/25
---
---
9,612
34.8
D
R
5/13/25 - 4:39:34 pm
49
    
 
BATRA RAJ
DIR
JB
---
2,479
---
5/12/25
---
---
15,445
19.1
D
R
5/13/25 - 4:35:52 pm
50
    
 
COLELLA GERARD G
DIR
JB
---
2,479
---
5/12/25
---
---
8,217
43.2
D
R
5/13/25 - 4:33:04 pm
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