Top 15 stocks added by Robinhood users today  1 Workhorse $WKHS 2 Plug Power $PLUG 3 Castor $CTRM 4 Translate $TBIO 5 Inovio $INO 6 Top Ships $TOPS 7 Tesla $TSLA 8 Hertz $HTZ 9 Titan $TTNP 10 Seanergy $SHIP 11 $AMZN