Masimo (MASI) Stock Chart & Stock Price History $153.72 +3.47 (+2.31%) Closing price 10/8/2025 04:00 PM EasternExtended Trading$151.92 -1.80 (-1.17%) As of 10/8/2025 07:38 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Masimo Stock Price Performance The Masimo (MASI) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 7.13%, with a year-to-date return of -7.01%. In the past month, the stock has increased 3.78%, reflecting recent market activity. As of the latest close, Masimo traded at $153.72 with a market cap of $8.35 billion and volume of 633,191 shares. Five years ago, the stock traded at $242.43, representing a 36.59% decrease over that period. At the time, it had a market cap of $13.32 billion and a volume of 230,866 shares. Receive MASI Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Masimo and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. 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Read our full terms of service and privacy policy. 5 Day Performance+4.37%1 Month Performance+3.78%3 Month Performance-7.07%Year-To-Date Performance-7.01%1 Year Performance+7.13%5 Year Performance-36.59% MASI Stock Chart for Thursday, October, 9, 2025 MASI Chart by TradingView Masimo Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization10/08/2025$150.25$153.72+2.31%$154.23$148.99633,191 shs$8.35 billion10/07/2025$148.13$150.25+1.43%$152.43$148.491.13 million shs$8.16 billion10/06/2025$147.29$148.13+0.57%$149.37$146.43883,896 shs$8.05 billion10/03/2025$146.05$147.29+0.85%$148.98$145.77545,261 shs$8.00 billion10/02/2025$142.54$146.05+2.46%$146.12$140.89622,554 shs$7.93 billion10/01/2025$147.55$142.54-3.40%$149.19$140.82983,612 shs$7.74 billion09/30/2025$142.94$147.55+3.23%$148.42$142.67672,449 shs$8.02 billion09/29/2025$141.40$142.94+1.09%$143.05$140.51664,706 shs$7.77 billion09/26/2025$139.75$141.40+1.18%$142.81$139.60652,023 shs$7.68 billion09/25/2025$140.42$139.75-0.48%$139.80$136.64737,973 shs$7.59 billion Get the Latest News and Ratings for MASI and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Masimo and its competitors with MarketBeat's FREE daily newsletter. 09/24/2025$140.36$140.42+0.04%$143.05$139.23715,054 shs$7.63 billion09/23/2025$142.13$140.36-1.25%$143.97$140.25727,182 shs$7.63 billion09/22/2025$140.43$142.13+1.21%$142.32$137.84441,218 shs$7.72 billion09/19/2025$143.00$140.43-1.80%$143.23$140.161.11 million shs$7.63 billion09/18/2025$141.23$143.00+1.25%$144.02$140.57566,785 shs$7.77 billion09/17/2025$143.00$141.23-1.24%$144.59$140.11997,551 shs$7.67 billion09/16/2025$145.72$143.00-1.87%$145.71$141.73770,677 shs$7.77 billion09/15/2025$147.44$145.72-1.17%$148.95$145.15547,411 shs$7.92 billion09/12/2025$146.21$147.44+0.84%$148.40$143.90699,217 shs$8.01 billion09/11/2025$145.82$146.21+0.27%$149.35$144.85646,735 shs$7.94 billion09/10/2025$148.12$145.82-1.55%$148.46$144.63360,599 shs$7.92 billion09/09/2025$148.79$148.12-0.45%$149.46$147.17357,227 shs$8.05 billion09/08/2025$147.19$148.79+1.09%$149.95$145.92740,286 shs$8.08 billion Related Companies AMN Healthcare Services Stock Price Chart Veeva Systems Stock Price Chart DexCom Stock Price Chart STERIS Stock Price Chart Insulet Stock Price Chart Hologic Stock Price Chart Baxter International Stock Price Chart Globus Medical Stock Price Chart Teleflex Stock Price Chart Integer Stock Price Chart Receive MASI Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Masimo and its competitors with MarketBeat's FREE daily newsletter. 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