Insider trading

Period: 120 months Stock: MKSI Minimum amount: $1M × + Add filter Clear all
Views & alerts

Save your view. Keep the filter you have built, and get an email when a new filing matches it. A free account does both.

When

Period

How far back the list reaches. Filings arrive days after the trade, so the newest rows always lag a little.

32 decisions over 120 months
Who

Role

The position the person holds at the company, read from the title on the filing. A chief executive who is also a director counts as the chief executive.

32 decisions over 120 months
The trade

Type of trade

Purchases, sales, or cluster buys: companies where 3 or more insiders bought within 30 days. The number beside each is what that choice would give.

32 decisions over 120 months
The trade

Minimum amount

Hides rows under this value. The amount is the shares traded times the price on the filing.

32 decisions over 120 months Remove this filter
The trade

Plan

  • Discretionary: they chose to sell that week.
  • Scheduled: a 10b5-1 plan fixed the sale months in advance, so the timing says nothing about what they knew.
  • Not stated: filed before the SEC added the box in April 2023, which is most of the older half of this database.
32 decisions over 120 months
The trade

Share of their own holding

How much of what they already held the trade moved. Selling a tenth of a stake is not the same act as selling all of it.

At least
32 decisions over 120 months
Ownership

What the chief executive holds

The value of the chief executive’s stock measured against base salary. The salary comes from the company’s own proxy. Companies with no figure are in neither direction.

32 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
14 Aug 2026
Lee John Tseng-Chung President & CEO
Sold on a plan
$3.02M 10,000 at 302.01
6.9%
Planned (10b5-1)
12 Jun 2026
Sold at will 3×
$1.21M 3,500 at 345.82
15.4%
Not planned
1 Jun 2026
Henry David Philip EVP, Global Str Mktg & GM, MSD
Sold at will
$1.89M 6,000 at 314.43
36.5%
Not planned
27 May 2026
COLELLA GERALD G Director · indirect
Sold on a plan 7×
$6.67M 20,000 at 333.40
50.0%
Planned (10b5-1)
22 May 2026
Lee John Tseng-Chung President & CEO
Sold on a plan
$3.15M 10,000 at 315.48
6.5%
Planned (10b5-1)
22 May 2026
Sold on a plan
$2.78M 8,810 at 315.48
100.0%
Sold half or more
11 May 2026
Burke Kathleen Flaherty EVP, GC & Secretary
Sold at will
$1.39M 4,355 at 319.94
8.1%
Not planned
6 Mar 2026
Taranto Eric Robert EVP & GM, VSD
Sold at will
$1.01M 4,568 at 220.52
22.8%
Not planned
24 Feb 2026
COLELLA GERALD G Director · indirect
Sold at will
$2.54M 10,000 at 253.97
20.0%
Not planned
24 Feb 2026
Sold at will
$1.05M 4,100 at 255.00
14.9%
Not planned
20 Feb 2026
Lee John Tseng-Chung President & CEO
Sold at will 4×
$7.70M 30,000 at 256.77
16.2%
Not planned
20 Feb 2026
COLELLA GERALD G Director · indirect
Sold at will
$2.53M 10,000 at 252.90
16.7%
Not planned
20 Feb 2026
Burke Kathleen Flaherty EVP, GC & Secretary
Sold at will
$1.06M 4,254 at 250.00
7.3%
Not planned
22 Feb 2024
BAGSHAW SETH H EVP, CFO & Treasurer
Sold at will 3×
$4.05M 32,865 at 123.28
100.0%
Sold half or more
9 Feb 2024
COLELLA GERALD G Director · indirect
Sold on a plan
$1.20M 10,000 at 120.00
12.8%
Planned (10b5-1)
22 Jan 2024
COLELLA GERALD G Director · indirect
Sold on a plan
$1.10M 10,000 at 110.00
11.4%
Planned (10b5-1)
6 Sep 2023
BAGSHAW SETH H EVP, CFO & Treasurer
Sold at will 2×
$2.43M 25,000 at 97.30
54.9%
Sold half or more
31 Aug 2023
COLELLA GERALD G Director · indirect
Sold on a plan
$1.00M 10,000 at 100.01
10.2%
Planned (10b5-1)
7 Aug 2023
Burke Kathleen Flaherty EVP, GC & Secretary
Sold at will 2×
$1.17M 11,563 at 101.23
21.3%
Not planned
8 May 2023
Carlyle Group Inc. 10% owner · indirect
Sold at will
$172.25M 2,000,000 at 86.13
23.6%
Not planned
8 May 2023
Sold at will
$172.25M 2,000,000 at 86.13
23.6%
Not planned
15 Apr 2021
BAGSHAW SETH H Sr. VP, CFO & Treasurer
Sold, plan not stated 5×
$1.68M 9,000 at 186.86
31.7%
5 May 2020
Sold, plan not stated
$1.74M 18,143 at 95.95
90.2%
Sold half or more
30 Oct 2019
Burke Kathleen Flaherty Sr. VP, GC & Secretary
Sold, plan not stated
$1.15M 10,384 at 110.55
26.5%
29 Oct 2019
BAGSHAW SETH H Sr. VP, CFO & Treasurer
Sold, plan not stated
$2.02M 18,000 at 112.08
48.8%
1 May 2018
COLELLA GERALD G CEO, President, Director · indirect
Sold, plan not stated
$1.02M 10,000 at 101.92
21.6%
21 Feb 2018
Abrams John R Sr. VP, Global Sales & Service
Sold, plan not stated
$1.13M 9,831 at 114.94
100.0%
Sold half or more
20 Feb 2018
Lee John Tseng-Chung Sr. VP & COO
Sold, plan not stated 2×
$1.55M 13,432 at 115.38
100.0%
Sold half or more
15 Feb 2018
PHILLIPPY ROBERT J Director · indirect
Sold, plan not stated
$1.09M 10,000 at 109.15
57.6%
Sold half or more
8 Jan 2018
BAGSHAW SETH H Sr. VP, CFO & Treasurer
Sold, plan not stated
$1.02M 10,000 at 102.07
45.9%
1 May 2017
Sold, plan not stated
$1.45M 18,400 at 78.58
44.9%
22 Feb 2017
Lee John Tseng-Chung Sr. VP & COO
Sold, plan not stated
$1.00M 14,734 at 67.99
100.0%
Sold half or more
Showing 1–32 of 32.