Lisa C. McClain bought MKS Instruments Inc (NASDAQ: MKSI)
Lisa C. McClain (R-MI), a U.S. Representative, has disclosed 4 trades in MKS Instruments Inc (MKSI) since 2025, 2 purchases and 2 sales, worth an estimated $32K in disclosed volume (the midpoint of the dollar ranges members report, not exact amounts).
The trade highlighted here is a purchase: Lisa C. McClain bought $1,001 - $15,000 of MKS Instruments Inc (NASDAQ: MKSI) on October 30, 2025. Since that trade, MKSI is up +111.06% against the S&P 500 up +9.72%, an outperformance of +101.34%.
Across these filings, Lisa C. McClain has been a balanced trader of MKSI (a buy-to-sell ratio of 1.00). The most recent disclosed MKSI transaction shown was dated October 31, 2025. Each row in the table below links to that trade and its post-trade performance versus the market.
Data updated
Lisa C. McClain's MKSI trades vs the price
MKSI is up +111.06% since Lisa C. McClain bought on October 30, 2025, versus +9.72% for the S&P 500.
Performance since this trade
All Lisa C. McClain MKSI trades
| Traded | Type | Size | Return | Est. profit | |
|---|---|---|---|---|---|
| October 31, 2025 | SELL | $143.35 | +104.60% | — | |
| October 30, 2025 | BUY | $138.96 | +111.06% | +$9K | |
| October 30, 2025 | SELL | $138.96 | +111.06% | — | |
| August 4, 2025 | BUY | $93.57 | +213.46% | +$17K |
Estimated profit is shown for buys only, marked to the latest close. It is an estimate and does not net later sells, taxes, or fees.
Lisa C. McClain & MKSI trading FAQ
Is it legal for Lisa C. McClain to trade MKS Instruments Inc (MKSI) stock?
Yes. Members of Congress are allowed to trade individual stocks, including MKS Instruments Inc (MKSI), but the STOCK Act of 2012 requires them to publicly disclose each transaction within 45 days. Quantellect tracks those disclosures; this page does not imply the trade was improper.
When did Lisa C. McClain buy MKSI?
Lisa C. McClain disclosed a purchase of $1,001 - $15,000 of MKS Instruments Inc (MKSI) on October 30, 2025, according to public STOCK Act filings.
How has MKSI performed since Lisa C. McClain's trade?
Since Lisa C. McClain bought MKSI on October 30, 2025, the stock is up +111.06%, versus +9.72% for the S&P 500 over the same period, an outperformance of +101.34%.
How many times has Lisa C. McClain traded MKSI?
Lisa C. McClain has disclosed 4 MKSI trades since 2025 (2 purchases and 2 sales). Every disclosed trade is listed on this page.
How soon must members of Congress disclose a trade?
Under the STOCK Act, members of Congress must publicly report a covered transaction within 45 days of the trade. Filings can still be delayed, amended, or contain errors.
Where can I see all congressional MKSI trades?
Quantellect tracks every disclosed congressional trade in MKS Instruments Inc (MKSI) on the MKS Instruments Inc congressional trading page, which aggregates filings across all members of Congress.
Lisa C. McClain's MKSI tradesAll congressional filings for MKS Instruments IncLisa C. McClain's full profile
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. Estimated prices and post-trade returns are derived algorithmically from public filings and end-of-day market data and describe historical activity, not a recommendation. Always do your own research and consult a licensed financial advisor before making investment decisions.