Tech stocks are scaring traders silly

Tech companieshave been the story of the stock market in 2017, surging to new highs and outperforming the broader market, all while helping lead major indices into rarefied air. Now investors are starting to get spooked. Which is not to say they're turning their backs entirely. The tech-heavy Nasdaq 100 index is still within 3% of a record reached a month ago. Rather, what traders are doing is loading up on hedges — and they're doing so in droves. Investors are paying the highest premium since...