BioLargo (BLGO) Stock Chart & Stock Price History $0.16 -0.02 (-13.01%) As of 09/25/2025 03:59 PM Eastern Add Compare Share Share Chart Stock AnalysisChartCompetitorsHeadlinesSEC FilingsShort InterestTrendsBuy This Stock BioLargo Stock Price Performance The BioLargo (BLGO) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 32.58%, with a year-to-date return of -13.42%. In the past month, the stock has decreased 20.38%, reflecting recent market activity. As of the latest close, BioLargo traded at $0.16 with a market cap of $50.99 million and volume of 3.48 million shares. Five years ago, the stock traded at $0.15, representing a 8.51% increase over that period. At the time, it had a market cap of $32.54 million and a volume of 412,962 shares. Receive BLGO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for BioLargo and its competitors with MarketBeat's FREE daily newsletter. 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Read our full terms of service and privacy policy. 5 Day Performance-18.52%1 Month Performance-20.38%3 Month Performance-17.09%Year-To-Date Performance-13.42%1 Year Performance-32.58%5 Year Performance+8.51% BLGO Stock Chart for Friday, September, 26, 2025 BLGO Chart by TradingView BioLargo 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 Capitalization09/25/2025$0.19$0.16-13.01%$0.20$0.143.48 million shs$50.99 million09/24/2025$0.19$0.19-1.61%$0.20$0.18596,795 shs$58.61 million09/23/2025$0.20$0.19-3.32%$0.20$0.19431,902 shs$59.57 million09/22/2025$0.20$0.20-1.54%$0.20$0.19424,049 shs$61.62 million09/19/2025$0.21$0.20-2.37%$0.21$0.19404,766 shs$62.43 million09/18/2025$0.22$0.21-4.48%$0.22$0.20390,420 shs$63.94 million09/17/2025$0.23$0.22-5.09%$0.23$0.21503,345 shs$66.94 million09/16/2025$0.22$0.23+1.56%$0.23$0.21671,010 shs$70.53 million09/15/2025$0.21$0.22+4.95%$0.23$0.21544,298 shs$69.45 million09/12/2025$0.23$0.21-6.96%$0.23$0.21154,809 shs$66.14 million Get the Latest News and Ratings for BLGO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for BioLargo and its competitors with MarketBeat's FREE daily newsletter. 09/11/2025$0.23$0.23+1.59%$0.23$0.22238,924 shs$71.08 million09/10/2025$0.21$0.23+8.12%$0.23$0.21193,069 shs$69.97 million09/09/2025$0.21$0.21+1.65%$0.21$0.20192,534 shs$64.81 million09/08/2025$0.22$0.21-5.94%$0.22$0.21536,905 shs$63.67 million09/05/2025$0.22$0.22-1.22%$0.23$0.21856,732 shs$67.58 million09/04/2025$0.23$0.22-1.47%$0.23$0.21150,976 shs$68.41 million09/03/2025$0.22$0.23+3.59%$0.23$0.22268,410 shs$69.43 million09/02/2025$0.22$0.22-0.73%$0.22$0.20242,424 shs$67.02 million09/01/2025$0.22$0.22$0.23$0.21179,169 shs$67.52 million08/29/2025$0.22$0.22-1.84%$0.23$0.21179,169 shs$67.43 million08/28/2025$0.21$0.22+8.63%$0.23$0.21728,899 shs$68.69 million08/27/2025$0.21$0.21-0.68%$0.21$0.20375,105 shs$63.23 million08/26/2025$0.19$0.21+8.74%$0.21$0.19263,420 shs$63.67 million08/25/2025$0.20$0.19-4.04%$0.21$0.19318,127 shs$58.55 million Related Companies AMTX Stock Chart FSI Stock Chart VGAS Stock Chart LODE Stock Chart ZTEK Stock Chart ALTO Stock Chart LOOP Stock Chart TSE Stock Chart ORGN Stock Chart CBUS Stock Chart Receive BLGO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for BioLargo and its competitors with MarketBeat's FREE daily newsletter. 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