"People are becoming rather shy about the tech sector in general for the time being," said Sid Mokhtari, executive director of institutional equity research at CIBC. The tech sector also took a hit from Treasury Secretary Janet Yellen's comments that interest rates may have to rise to prevent the economy from overheating. The sector tends to underperform amid concerns about rising rates. The former Federal Reserve chairwoman's comments carry weight, said Mokhtari. With her successor, Jerome Powell, insisting that monetary stimulus will remain in place despite corporate concerns about inflatio...