Traders and company executives gather for the Uber Technologies Inc. IPO on the trading floor of the New York Stock Exchange (NYSE) in New York, U.S., May 10, 2019. Brendan McDermid/Reuters A contrarian indicator from Bank of America that measures investor bullishness jumped in November as vaccine progress sparked optimism on Wall Street.BofA's Sell Side Indicator rose to 57.8%, the highest level of bullishness in 18 months.