U.S. stock indexes stumbled midday Thursday as the economic symposium in Jackson Hole, Wyo., convened. Federal Reserve Chair Janet Yellen will speak Friday.
XAutoplay: On | Off popped almost 3% higher in heavy volume as the stock approached its 50-day line. The stock fell under its 50-day line in early August despite topping earnings estimates Aug. 9. The bottom has fallen out for the fiber optics stock group. Three weeks ago, the group was No. 1 among 197 industry groups. But now it is ranked in the middle of the pack, around No. 100.