Omeros (OMER) Stock Chart & Stock Price History $4.48 +0.29 (+6.92%) Closing price 04:00 PM EasternExtended Trading$4.47 -0.01 (-0.22%) As of 06:07 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 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 5.54%, with a year-to-date return of -54.66%. In the past month, the stock has increased 23.08%, reflecting recent market activity. As of the latest close, Omeros traded at $4.19 with a market cap of $258.78 million and volume of 1.15 million shares. Five years ago, the stock traded at $12.44, representing a 63.99% decrease over that period. At the time, it had a market cap of $723.46 million and a volume of 1.20 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. Email Address 5 Day Performance+1.59%1 Month Performance+23.08%3 Month Performance+44.05%Year-To-Date Performance-54.66%1 Year Performance+5.54%5 Year Performance-63.99% OMER Stock Chart for Thursday, August, 21, 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 Capitalization08/20/2025$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 million08/15/2025$4.12$4.41+7.04%$4.54$4.152.68 million shs$272.36 million08/14/2025$4.27$4.12-3.51%$4.27$4.05798,484 shs$254.46 million08/13/2025$4.18$4.27+2.15%$4.30$4.131.02 million shs$263.72 million08/12/2025$4.14$4.18+0.97%$4.23$4.02657,057 shs$258.16 million08/11/2025$4.06$4.14+1.97%$4.19$3.89845,939 shs$255.69 million08/08/2025$3.78$4.06+7.41%$4.06$3.781.06 million shs$250.75 million08/07/2025$3.86$3.78-2.07%$3.91$3.70498,909 shs$233.46 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. 08/06/2025$4.02$3.86-3.98%$4.05$3.80905,261 shs$238.39 million08/05/2025$3.70$4.02+8.65%$4.04$3.611.32 million shs$248.28 million08/04/2025$3.61$3.70+2.49%$3.74$3.441.40 million shs$228.52 million08/01/2025$3.87$3.61-6.72%$3.83$3.521.86 million shs$222.96 million07/31/2025$3.85$3.87+0.52%$4.08$3.801.23 million shs$239.01 million07/30/2025$3.97$3.85-3.02%$4.11$3.811.40 million shs$237.78 million07/29/2025$4.15$3.97-4.34%$4.23$3.851.71 million shs$232.61 million07/28/2025$3.83$4.15+8.36%$4.45$3.805.10 million shs$243.15 million07/25/2025$3.59$3.83+6.69%$4.52$3.625.31 million shs$224.40 million07/24/2025$3.82$3.59-6.02%$3.87$3.58637,229 shs$210.34 million07/23/2025$3.74$3.82+2.14%$3.91$3.64816,282 shs$223.83 million07/22/2025$3.64$3.74+2.75%$3.80$3.59758,748 shs$219.13 million07/21/2025$3.36$3.64+8.33%$3.81$3.371.23 million shs$213.27 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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