Kevin Hern bought Masimo Corporation (NASDAQ: MASI)
Kevin Hern (R-OK), a U.S. Representative, has disclosed 4 trades in Masimo Corporation (MASI) since 2021, 2 purchases and 2 sales, worth an estimated $315K in disclosed volume (the midpoint of the dollar ranges members report, not exact amounts).
The trade highlighted here is a purchase: Kevin Hern bought $15,001 - $50,000 of Masimo Corporation (NASDAQ: MASI) on June 25, 2021. Since that trade, MASI is down -26.29% against the S&P 500 up +82.48%, an outperformance of -108.78%.
Across these filings, Kevin Hern has been a balanced trader of MASI (a buy-to-sell ratio of 1.00). The most recent disclosed MASI transaction shown was dated September 26, 2025. Each row in the table below links to that trade and its post-trade performance versus the market.
Data updated
Kevin Hern's MASI trades vs the price
MASI is down -26.29% since Kevin Hern bought on June 25, 2021, versus +82.48% for the S&P 500.
Performance since this trade
All Kevin Hern MASI trades
Kevin Hern & MASI trading FAQ
Is it legal for Kevin Hern to trade Masimo Corporation (MASI) stock?
Yes. Members of Congress are allowed to trade individual stocks, including Masimo Corporation (MASI), 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 Kevin Hern buy MASI?
Kevin Hern disclosed a purchase of $15,001 - $50,000 of Masimo Corporation (MASI) on June 25, 2021, according to public STOCK Act filings.
How has MASI performed since Kevin Hern's trade?
Since Kevin Hern bought MASI on June 25, 2021, the stock is down -26.29%, versus +82.48% for the S&P 500 over the same period, an outperformance of -108.78%.
How many times has Kevin Hern traded MASI?
Kevin Hern has disclosed 4 MASI trades since 2021 (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 MASI trades?
Quantellect tracks every disclosed congressional trade in Masimo Corporation (MASI) on the Masimo Corporation congressional trading page, which aggregates filings across all members of Congress.
Kevin Hern's MASI tradesAll congressional filings for Masimo CorporationKevin Hern'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.