$NKLA Nikola Option Alert: Fri $50 Calls at the Ask: 1000 @ $16.4 vs 439 OI; Ref=$66.41 [6/17/2020, 10:05:12 AM] [+$500k Sweeps Above Midpoint] Other Sweeps on: $GPS $MA $VSTO $SRNE $BITA $DB $TNK $BA $AON $UAL $XLP $CRM