There was 3.5x the normal volume of options in Zoom Video Communications (ZM) on one day last week. 64% of the trade were calls, which suggests a slightly bullish bias. ZM had dropped quite a bit recently after releasing disappointing earnings. However, Cathie Wood and her ARKK fund decided to use the opportunity to buy more ZM shares. This may have sparked a trader to execute a $15 million long call trade. The trader purchased over 6,000 in-the-money calls expiring in December.