What do these Option Alerts mean?
Uber Technologies Option Alert: Jan 17 $31 Calls Sweep (19) near the Ask: 1000 @ $0.6 vs 5648 OI; Earnings 2/4 Before Open [est] Ref=$28.695
Slack Technologies Option Alert: Fri $21 Calls Sweep (41) near the Ask: 543 @ $0.5 vs 155 OI; Ref=$21.11