U.S. stocks sold off Thursday as profit-takers again hold court

NEW YORK, New York - Profit-taking continued to weigh on U.S. stock markets on Thursday with the technology sector again taking the most heat.

"It's not a surprise to see some investors taking profits in tech stocks, which have had an incredibly strong run, with some up over 80 percent since the early April lows," Carol Schleif, chief market strategist at BMO Private Wealth told CNBC Thur