He’s mercurial.” Bierman, chief market technician at Theo Trade and an adjunct professor of finance at Loyola University Chicago, says investors will be dealing with greater stock-market volatility and uncertainty during the Trump administration.

U.S. stock indexes are drifting higher Tuesday following a mostly encouraging batch of profit reports from big companies. The S&P 500 was 0.6% higher in early trading, as many markets around the world took tentative steps following Donald Trump’sreturn to the White House on Monday.