The president’s tariffs were intended to assert US dominance, but they are increasingly a self-inflicted wound that may undermine the economic strength he champions

Swiss bank UBS AG may have lost as much as $350 million due to technical glitches on the Nasdaq stock exchange the day Facebook went public.

Facebook shares have fizzled on their first day of trade on the Nasdaq, erasing early gains of as much as 18% at close to their IPO price.

Microsoft is expected to post a 9% increase in fiscal fourth-quarter profit, but investors may be distracted by evidence of flickering PC sales.

The jostling for dominance among the world’s leading stock market operators has seen many alliances and feuds, but it has rarely had a day as dramatic as last week, when some of…