Bloomberg Nancy Tengler has managed money for 35 years. She’s confident in her positions. When one of her companies reports good earnings, she expects it to go up. But nothing prepared her for what happened on Aug. 26 in Salesforce.com Inc., when its quarterly results ignited a paroxysm of buying that pushed the shares 26% higher in a day. Tengler’s …

Bloomberg A sell-off of technology shares in the US is reverberating in Canada, even though the sector makes up only a 10th of the nation’s stock market. The small contribution of tech stocks to Canada’s market helped the S&P/TSX Composite Index outperform its US counterpart: Canada was down 1.5%, while the S&P 500 Index plunged 3.5%. But as the rout …

Bloomberg Oil in New York closed below $40 a barrel for the first time in a month as a selloff in broader markets exacerbated concerns over weakening demand following a sluggish summer driving season. US benchmark crude futures tumbled nearly 4%, leading oil to post its worst week since June. Stocks weakened and the S&P 500 Index dropped more than …