Get Tantech alerts:Net Margins Return on Equity Return on Assets Tantech N/A N/A N/A Northern Technologies International 3.46% 3.38% 2.66%Insider and Institutional Ownership6.0% of Tantech shares are owned by institutional investors. Comparatively, 32.9% of Northern Technologies International shares are owned by institutional investors. Comparatively, 24.3% of Northern Technologies International shares are owned by insiders. Gross Revenue Price/Sales Ratio Net Income Earnings Per Share Price/Earnings Ratio Tantech $42.94 million 0.00 -$3.24 million N/A N/A Northern Technologies International $85.06 million 0.85 $5.41 million $0.30 25.53Northern Technologies International has higher revenue and earnings than Tantech. Comparatively, Northern Technologies International has a beta of 0.31, indicating that its stock price is 69% less volatile than the S&P 500.