Khouw noticed during the session on Wednesday that somebody sold 7,000 contracts of the January 2022, $45 strike calls for $8.87 and bought 406,000 shares of Slack. The trade is going to make the most money if the stock goes up to the $45 strike at the January 2022 expiration, explained Khouw. He added that it will also make money if it drifts higher and volatility comes in.