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MKSI
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MKS Inc.

MKSI · Technology · MKS Inc. provides foundational technology solutions to semiconductor manufacturing, electronics and packaging, and specialty industrial app…

MKS Inc. (MKSI), in the Technology sector, has 28 disclosed filings on Paydirt over the trailing twelve months from 1 member of Congress and 12 corporate insiders: 1 purchase and 28 sales. Filers took a median of 3 days from execution to disclosure, and the most recent trade was executed Aug 14 and filed Aug 17. The most active filer was David Philip Henry with 5 filings.

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Filings, ttm
28
1 buy · 28 sells
Traders, ttm
13
1 congress · 12 insiders
Volume, ttmiDollar value disclosed in the window
$42.9M
estimated for Congress, as filed for insiders
Median delay
3d
execution to disclosure
Last traded
Aug 14
Filed Aug 17
ADViAverage daily dollar volume
$415.2M
market data
Share price · 12M
$300 (+135.5%)
$445$283$121Sep 22 2025Mar 6Aug 18

Adjusted for splits and dividends.

Volume by month
$17.5M$8.8M$0Oct 2024Apr 2025Oct 2025Apr 2026Feb 2025 · sells $836KJul 2025 · sells $210KSep 2025 · buys $8KSep 2025 · sells $754KNov 2025 · buys $8KNov 2025 · sells $16KFeb 2026 · sells $17.2MMar 2026 · sells $1.0MMay 2026 · sells $17.5MJun 2026 · sells $4.0MAug 2026 · sells $3.2M
Buys $16K Sells $44.7M

Estimated for Congress, as filed for insiders · by filing month · past 24 months

Who filed
DH David Philip Henry EVP, Operations & Corp Mktg 5 filings JS James Alan Schreiner EVP & COO 4 filings JL John Tseng-Chung Lee President & CEO 3 filings JM Jacqueline F Moloney Director 3 filings ET Eric Robert Taranto EVP & GM, VSD 3 filings LM Lisa McClain Representative (Spouse) 2 filings KB Kathleen Flaherty Burke EVP, GC & Secretary 2 filings PI Peter Cannone Iii Director 2 filings
Recent filings
John Tseng-Chung LeeSALE President & CEO $3.0M
10,000 sh × $302.01
Exec Aug 14
Filed Aug 17 · 10:11 AM ET
John Edward WilliamsSALE EVP & GM, PSD $132K
457 sh × $288.31
Exec Aug 3
Filed Aug 4 · 12:21 PM ET
James Alan SchreinerSALE EVP & COO $1.1M
3,283 sh across 2 lots
Exec Jun 12
Filed Jun 16 · 5:30 PM ET
James Alan SchreinerSALE EVP & COO $248K
781 sh × $317.42
Exec Jun 10
Filed Jun 11 · 5:30 PM ET
Michelle M McCarthySALE SVP & Chief Accounting Officer $767K
2,434 sh × $315.23
Exec Jun 5
Filed Jun 8 · 5:30 PM ET
David Philip HenrySALE EVP, Global Str Mktg & GM, MSD $1.9M
6,000 sh × $314.43
Exec Jun 1
Filed Jun 2 · 5:30 PM ET
Gerald G ColellaSALE Director $6.6M
19,787 sh across 6 lots
Exec May 27
Filed May 28 · 5:30 PM ET
Joseph B DonahueSALE Director $689K
2,100 sh × $327.95
Exec May 27
Filed May 28 · 5:30 PM ET
David Philip HenrySALE EVP, Global Str Mktg & GM, MSD $826K
2,500 sh × $330.50
Exec May 26
Filed May 27 · 5:30 PM ET
John Tseng-Chung LeeSALE President & CEO $3.2M
10,000 sh × $315.48
Exec May 22
Filed May 26 · 5:30 PM ET
Ramakumar MayampurathSALE EVP & CFO $2.8M
8,810 sh × $315.48
Exec May 22
Filed May 26 · 5:30 PM ET
Peter Cannone IiiSALE Director $410K
1,350 sh × $303.40
Exec May 18
Filed May 19 · 5:30 PM ET
Jacqueline F MoloneySALE Director $312K
1,000 sh × $312.20
Exec May 14
Filed May 15 · 5:30 PM ET
Jacqueline F MoloneySALE Director $447K
1,400 sh × $318.99
Exec May 13
Filed May 14 · 5:30 PM ET
Kathleen Flaherty BurkeSALE EVP, GC & Secretary $1.4M
4,355 sh × $319.94
Exec May 11
Filed May 12 · 5:30 PM ET
Eric Robert TarantoSALE EVP & GM, VSD $911K
2,849 sh × $319.93
Exec May 11
Filed May 12 · 5:30 PM ET
Eric Robert TarantoSALE EVP & GM, VSD $1.0M
4,568 sh × $220.52
Exec Mar 6
Filed Mar 9 · 5:30 PM ET
James Alan SchreinerSALE EVP & COO $1.0M
4,100 sh × $255.00
Exec Feb 24
Filed Feb 25 · 5:30 PM ET
Gerald G ColellaSALE Director $5.1M
20,000 sh across 2 lots
Exec Feb 20
Filed Feb 24 · 5:30 PM ET
John Tseng-Chung LeeSALE President & CEO $7.7M
30,000 sh across 4 lots
Exec Feb 20
Filed Feb 23 · 5:30 PM ET
Kathleen Flaherty BurkeSALE EVP, GC & Secretary $1.1M
4,254 sh × $250.00
Exec Feb 20
Filed Feb 23 · 5:30 PM ET
John Edward WilliamsSALE EVP & GM, PSD $524K
2,043 sh × $256.41
Exec Feb 20
Filed Feb 23 · 5:30 PM ET
Jacqueline F MoloneySALE Director $205K
829 sh × $247.55
Exec Feb 20
Filed Feb 23 · 5:30 PM ET
Michelle M McCarthySALE VP & Chief Accounting Officer $367K
1,466 sh across 2 lots
Exec Feb 20
Filed Feb 23 · 5:30 PM ET
David Philip HenrySALE EVP, Global Str Mktg & GM, MSD $523K
2,000 sh × $261.56
Exec Feb 20
Filed Feb 23 · 5:30 PM ET