These two tech stocks have been popular investments with retail investors and they're both up more than 200% in the past 12 months.Two fairly small artificial intelligence (AI) stocks that have come up on the radars of retail investors in the past couple of years are BigBear.ai (BBAI -6.00%) and SoundHound AI (SOUN -8.02%). BigBear.ai is a data analytics company that has secured multiple contracts with government agencies. Often bullish investors compare to it the much larger Palantir Technologies, although ...