Omeros (OMER) Stock Chart & Stock Price History $4.26 +0.20 (+4.93%) Closing price 09/18/2025 04:00 PM EasternExtended Trading$4.30 +0.04 (+1.03%) As of 04:05 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 ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Omeros Stock Price Performance The Omeros (OMER) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 5.71%, with a year-to-date return of -56.88%. In the past month, the stock has decreased 2.29%, reflecting recent market activity. As of the latest close, Omeros traded at $4.26 with a market cap of $289.94 million and volume of 746,878 shares. Five years ago, the stock traded at $12.31, representing a 65.39% decrease over that period. At the time, it had a market cap of $671.12 million and a volume of 2.13 million shares. Receive OMER Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Omeros 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+2.65%1 Month Performance-2.29%3 Month Performance+32.30%Year-To-Date Performance-56.88%1 Year Performance+5.71%5 Year Performance-65.39% OMER Stock Chart for Friday, September, 19, 2025 OMER Chart by TradingView Omeros 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 Capitalization09/18/2025$4.06$4.26+4.93%$4.29$4.05746,878 shs$289.94 million09/17/2025$4.03$4.06+0.74%$4.23$3.941.06 million shs$276.32 million09/16/2025$4.09$4.03-1.47%$4.18$4.02703,019 shs$274.27 million09/15/2025$4.15$4.09-1.45%$4.20$4.05619,470 shs$278.37 million09/12/2025$4.20$4.15-1.19%$4.19$4.12562,994 shs$282.45 million09/11/2025$4.27$4.20-1.64%$4.33$4.20710,060 shs$285.85 million09/10/2025$4.26$4.27+0.23%$4.34$4.18901,537 shs$290.60 million09/09/2025$4.21$4.26+1.19%$4.27$4.16549,575 shs$289.94 million09/08/2025$4.17$4.21+0.96%$4.29$4.15597,700 shs$286.53 million09/05/2025$4.18$4.17-0.24%$4.28$4.12553,942 shs$283.81 million Get the Latest News and Ratings for OMER and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Omeros and its competitors with MarketBeat's FREE daily newsletter. 09/04/2025$4.18$4.18$4.25$4.07643,920 shs$284.47 million09/03/2025$4.29$4.18-2.56%$4.32$4.07767,814 shs$284.49 million09/02/2025$4.16$4.29+3.13%$4.44$4.14781,710 shs$291.98 million09/01/2025$4.16$4.16$4.24$4.09503,277 shs$283.11 million08/29/2025$4.23$4.16-1.65%$4.24$4.09503,277 shs$283.11 million08/28/2025$4.25$4.23-0.47%$4.33$4.19447,528 shs$287.89 million08/27/2025$4.38$4.25-2.97%$4.40$4.20428,164 shs$289.26 million08/26/2025$4.35$4.38+0.69%$4.46$4.26892,795 shs$298.09 million08/25/2025$4.40$4.35-1.14%$4.58$4.28854,637 shs$296.06 million08/22/2025$4.48$4.40-1.79%$4.54$4.36928,843 shs$299.46 million08/21/2025$4.19$4.48+6.92%$4.49$4.061.40 million shs$304.91 million08/20/2025$4.36$4.19-3.90%$4.30$4.121.15 million shs$258.78 million08/19/2025$4.22$4.36+3.32%$4.52$4.042.14 million shs$269.27 million08/18/2025$4.41$4.22-4.31%$4.55$4.221.33 million shs$260.63 million Related Companies NKTR Stock Price Chart ASMB Stock Price Chart CPIX Stock Price Chart LLY Stock Price Chart JNJ Stock Price Chart ABBV Stock Price Chart MRK Stock Price Chart PFE Stock Price Chart BMY Stock Price Chart ZTS Stock Price Chart Receive OMER Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Omeros and its competitors with MarketBeat's FREE daily newsletter. 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