Quantum (QMCO) Stock Chart & Stock Price History $12.86 -0.79 (-5.79%) Closing price 05/20/2025 04:00 PM EasternExtended Trading$12.68 -0.18 (-1.44%) As of 08:20 AM 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 ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Quantum Stock Price Performance The Quantum (QMCO) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 22.27%, with a year-to-date return of -76.15%. In the past month, the stock has increased 30.69%, reflecting recent market activity. As of the latest close, Quantum traded at $12.86 with a market cap of $89.38 million and volume of 6.39 million shares. Five years ago, the stock traded at a split-adjusted price of $78.20, representing a 83.55% decrease over that period. At the time, it had a market cap of $154.85 million and a volume of 13,470 shares. Receive QMCO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Quantum and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance+17.55%1 Month Performance+30.69%3 Month Performance-15.17%Year-To-Date Performance-76.15%1 Year Performance+22.27%5 Year Performance-83.55% QMCO Stock Chart for Wednesday, May, 21, 2025 QMCO Chart by TradingView Quantum 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 Capitalization05/20/2025$13.65$12.86-5.79%$14.23$12.026.39 million shs$89.38 million05/19/2025$10.94$13.65+24.77%$14.35$10.429.41 million shs$94.87 million05/16/2025$10.52$10.94+3.99%$11.47$10.501.82 million shs$76.03 million05/15/2025$11.01$10.52-4.45%$10.80$10.101.05 million shs$73.11 million05/14/2025$10.69$11.01+2.99%$11.86$10.851.56 million shs$76.52 million05/13/2025$11.13$10.69-3.95%$11.26$10.60768,488 shs$74.30 million05/12/2025$10.81$11.13+2.96%$11.40$10.901.26 million shs$77.35 million05/09/2025$11.45$10.81-5.59%$11.73$10.501.21 million shs$75.13 million05/08/2025$10.89$11.45+5.19%$11.64$10.941.42 million shs$79.58 million05/07/2025$11.32$10.89-3.84%$11.22$10.45492,485 shs$75.65 million Get the Latest News and Ratings for QMCO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Quantum and its competitors with MarketBeat's FREE daily newsletter. 05/06/2025$11.05$11.32+2.44%$11.50$10.50336,678 shs$78.67 million05/05/2025$11.19$11.05-1.25%$11.12$10.70393,528 shs$76.80 million05/02/2025$10.98$11.19+1.91%$11.65$11.08623,795 shs$77.77 million05/01/2025$10.80$10.98+1.67%$11.27$10.82344,110 shs$76.31 million04/30/2025$11.21$10.80-3.66%$10.91$10.36326,792 shs$75.06 million04/29/2025$11.51$11.21-2.61%$11.65$11.04354,755 shs$77.91 million04/28/2025$11.84$11.51-2.79%$12.80$11.33661,809 shs$79.99 million04/25/2025$11.38$11.84+4.04%$12.16$11.15672,645 shs$82.29 million04/24/2025$10.40$11.38+9.42%$12.05$10.57937,458 shs$74.28 million04/23/2025$9.92$10.40+4.84%$11.38$10.18745,309 shs$67.88 million04/22/2025$9.84$9.92+0.81%$10.13$9.59392,726 shs$64.75 million04/21/2025$10.32$9.84-4.65%$10.12$9.60309,805 shs$64.23 million Related Companies KOPN Stock Chart RDCM Stock Chart MKFG Stock Chart SILC Stock Chart LTRX Stock Chart INVE Stock Chart ALOT Stock Chart OSS Stock Chart ZEPP Stock Chart FOXX Stock Chart Receive QMCO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Quantum and its competitors with MarketBeat's FREE daily newsletter. 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