BioLargo - 24 Year Stock Price History | BLGO

Historical daily share price chart and data for BioLargo since 2001 adjusted for splits and dividends. The latest closing stock price for BioLargo as of April 25, 2025 is 0.24.
  • The all-time high BioLargo stock closing price was 53.50 on March 08, 2002.
  • The BioLargo 52-week high stock price is 0.37, which is 54.2% above the current share price.
  • The BioLargo 52-week low stock price is 0.16, which is 33.3% below the current share price.
  • The average BioLargo stock price for the last 52 weeks is 0.25.
For more information on how our historical price data is adjusted see the Stock Price Adjustment Guide.
BioLargo Historical Annual Stock Price Data
Year Average Stock Price Year Open Year High Year Low Year Close Annual % Change
2025 0.2621 0.2300 0.3000 0.2300 0.2365 24.47%
2024 0.2607 0.1700 0.4000 0.1700 0.1900 11.76%
2023 0.1868 0.2000 0.2400 0.1600 0.1700 -10.53%
2022 0.2198 0.2200 0.3100 0.1600 0.1900 -9.52%
2021 0.1873 0.1300 0.2500 0.1300 0.2100 75.00%
2020 0.1699 0.2187 0.2900 0.1200 0.1200 -44.44%
2019 0.2352 0.2261 0.3750 0.1600 0.2160 -9.81%
2018 0.2839 0.4119 0.4500 0.1800 0.2395 -37.79%
2017 0.5025 0.8320 0.8320 0.3850 0.3850 -53.45%
2016 0.5362 0.4901 0.9550 0.3111 0.8270 65.40%
2015 0.4312 0.3500 0.7200 0.2600 0.5000 61.29%
2014 0.5382 0.2500 1.0900 0.2400 0.3100 24.00%
2013 0.2590 0.2500 0.3900 0.1500 0.2500 4.17%
2012 0.3178 0.3300 0.4900 0.2200 0.2400 -25.00%
2011 0.3938 0.4800 0.5700 0.2200 0.3200 -36.00%
2010 0.3865 0.7000 0.7000 0.1500 0.5000 -28.57%
2009 0.4641 0.8900 0.8900 0.2100 0.7000 70.73%
2008 1.1672 0.9500 2.0000 0.3500 0.4100 -57.29%
2007 0.5760 0.3750 1.0100 0.3100 0.9600 220.00%
2006 0.4980 0.5000 1.0000 0.2500 0.3000 1100.00%
2005 0.3547 0.2500 1.0000 0.0250 0.0250 -88.89%
2004 0.5175 1.0000 1.5000 0.0200 0.2250 -77.50%
2003 2.3600 6.0000 7.0125 0.7500 1.0000 -85.19%
2002 19.3785 48.2500 53.5000 3.2500 6.7500 -86.36%
Sector Industry Market Cap Revenue
Construction Engineering - Research & Development Services $0.070B $0.018B
BioLargo Inc. is a cleantech and life sciences innovator and engineering services solution provider. The company's core products address PFAS contamination, achieve advanced water and wastewater treatment, control odor and VOCs. BioLargo Inc. is based in WESTMINSTER, CA.
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