MKS Instruments Inc Congressional Trading
According to U.S. congressional financial disclosures filed under the STOCK Act, members of Congress have reported 30 trades in MKS Instruments Inc (NASDAQ: MKSI) since 2018, across 4 members, worth an estimated $289.01K in disclosed volume (the midpoint of the dollar ranges members report, not exact amounts). 15 buys against 15 sells, an evenly split skew, with Democratic members responsible for 53% of the trades and Republican members 47%. The most recent disclosure shown was filed November 2025, and Lisa Mcclain has filed the most MKSI transactions among those shown, with 8. One notable disclosed move was a purchase by Lisa Mcclain on August 4, 2025, up 258.2% since. These figures are drawn from public House and Senate periodic transaction reports and reflect what members were required to disclose, not the current market value of any position. For the full record, including the month-by-month buy and sell timeline, the party breakdown, top buyers and sellers, and every individual filing, see the MKS Instruments Inc (MKSI) stock overview and the complete trade table below.
Data updated
Price & congressional trade timeline
Party breakdown
MKS Instruments congressional trading activity
| Politician | Published | Traded | Filed After | Type | Size | Return | |
|---|---|---|---|---|---|---|---|
 Lisa Mcclain House | Nov 24, 2025 | Oct 31, 2025 | 24 days | SELL |  $1,001 - $15,000 | +133.79% | |
Lisa Mcclain House | Nov 21, 2025 | Oct 31, 2025 | 21 days | SELL | $1,001 - $15,000 | +133.79% | |
Lisa Mcclain House | Nov 24, 2025 | Oct 30, 2025 | 25 days | SELL | $1,001 - $15,000 | +141.18% | |
Lisa Mcclain House | Nov 24, 2025 | Oct 30, 2025 | 25 days | BUY | $1,001 - $15,000 | +141.18% | |
Lisa Mcclain House | Nov 21, 2025 | Oct 30, 2025 | 22 days | BUY | $1,001 - $15,000 | +141.18% | |
Lisa Mcclain House | Nov 21, 2025 | Oct 30, 2025 | 22 days | SELL | $1,001 - $15,000 | +141.18% | |
Lisa Mcclain House | Sep 15, 2025 | Aug 4, 2025 | 42 days | BUY | $1,001 - $15,000 | +258.18% | |
Lisa Mcclain House | Sep 12, 2025 | Aug 4, 2025 | 39 days | BUY | $1,001 - $15,000 | +258.18% |
MKS Instruments (MKSI) congressional trading FAQ
Can members of Congress legally trade MKS Instruments (MKSI) stock?
Yes. Members of Congress are permitted to trade individual stocks, including MKS Instruments (MKSI), but the STOCK Act of 2012 requires them to publicly disclose each transaction within 45 days. BullishWhales tracks those disclosures; it does not imply any trade was improper.
Are congressional MKS Instruments (MKSI) trades public?
Yes. Every congressional trade in MKS Instruments (MKSI) on this page comes from mandatory public STOCK Act disclosure filings, which are filed with a delay and may be revised.
How many times has Congress traded MKS Instruments (MKSI)?
Members of Congress have disclosed 30 trades in MKS Instruments (MKSI) worth $289.01K across 4 members, according to public STOCK Act filings.
Which members of Congress have traded MKS Instruments (MKSI)?
Recent and active filers of MKS Instruments (MKSI) disclosures include Lisa Mcclain. The full member-by-member trade list is on this page.
Do Democrats or Republicans trade MKS Instruments (MKSI) more?
Across disclosed MKS Instruments (MKSI) trades, 53% were by Democrats and 47% by Republicans, led by Democrats (53%).
What is the most recent congressional MKS Instruments (MKSI) trade?
The most recent disclosed MKS Instruments (MKSI) trade was a purchase by Lisa Mcclain, filed Nov 23, 2025.
Browse all stocks Congress tradesCongressional trading overviewMKS Instruments (MKSI) stock overview
Not investment advice. Congressional trading data is sourced from public STOCK Act disclosures, which are filed with a delay and may contain errors or be revised. The Tide Score and other figures are generated algorithmically from public filings and market data and describe historical activity, not a recommendation. Always do your own research and consult a licensed financial advisor before making investment decisions.