Masimo (MASI) Stock Chart & Stock Price History $146.76 -7.17 (-4.66%) Closing price 04:00 PM EasternExtended Trading$146.63 -0.13 (-0.09%) As of 05:51 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 ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider 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 20.22%, with a year-to-date return of -11.22%. In the past month, the stock has decreased 4.99%, reflecting recent market activity. As of the latest close, Masimo traded at $153.93 with a market cap of $8.36 billion and volume of 528,907 shares. Five years ago, the stock traded at $218.89, representing a 32.95% decrease over that period. At the time, it had a market cap of $12.09 billion and a volume of 425,100 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. Email Address 5 Day Performance-3.36%1 Month Performance-4.99%3 Month Performance-5.40%Year-To-Date Performance-11.22%1 Year Performance+20.22%5 Year Performance-32.95% MASI Stock Chart for Tuesday, August, 19, 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 Capitalization08/19/2025$153.93$146.76-4.66%$154.70$146.491.02 million shs$7.97 billion08/18/2025$153.87$153.93+0.04%$155.88$153.45528,907 shs$8.36 billion08/15/2025$151.87$153.87+1.32%$158.30$152.92440,965 shs$8.36 billion08/14/2025$155.96$151.87-2.62%$152.02$147.21970,159 shs$8.25 billion08/13/2025$150.13$155.96+3.88%$156.71$151.71904,099 shs$8.47 billion08/12/2025$147.37$150.13+1.87%$151.54$147.47652,678 shs$8.16 billion08/11/2025$144.73$147.37+1.82%$149.66$144.27871,180 shs$8.01 billion08/08/2025$144.90$144.73-0.12%$147.40$144.17903,355 shs$7.85 billion08/07/2025$144.65$144.90+0.17%$148.08$144.28888,288 shs$7.86 billion08/06/2025$163.88$144.65-11.73%$162.98$135.833.73 million shs$7.84 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. 08/05/2025$161.27$163.88+1.62%$164.32$159.231.14 million shs$8.89 billion08/04/2025$153.95$161.27+4.75%$162.68$153.48962,017 shs$8.74 billion08/01/2025$153.79$153.95+0.10%$157.16$150.42476,023 shs$8.35 billion07/31/2025$156.02$153.79-1.43%$158.81$152.73633,392 shs$8.34 billion07/30/2025$158.94$156.02-1.84%$162.00$155.27861,588 shs$8.46 billion07/29/2025$162.18$158.94-2.00%$162.65$158.86487,977 shs$8.62 billion07/28/2025$164.62$162.18-1.48%$164.77$161.78549,021 shs$8.79 billion07/25/2025$161.38$164.62+2.01%$165.20$161.98561,631 shs$8.93 billion07/24/2025$165.00$161.38-2.19%$166.96$161.19454,270 shs$8.75 billion07/23/2025$158.23$165.00+4.28%$165.60$158.81631,382 shs$8.95 billion07/22/2025$155.13$158.23+2.00%$158.48$154.54571,839 shs$8.58 billion07/21/2025$154.47$155.13+0.43%$155.76$153.36412,277 shs$8.41 billion07/18/2025$158.35$154.47-2.45%$160.74$154.15509,178 shs$8.38 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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