Given investment horizon of 30 days, Parkervision Inc is expected to under-perform the SP 500. In addition to that, Parkervision is 2.74 times more volatile than S&P 500. It trades about -0.12 of its total potential returns per unit of risk. S&P 500 is currently generating about -0.12 per unit of volatility. If you would invest  165,535  in S&P 500 on May 21, 2013 and sell it today you would lose (2,642) from holding S&P 500 or give up 1.6% of portfolio value over 30 days.