Exfo Inc. (Nasdaq: EXFO) shares gained 21.7 percent to $9.21 Thursday. Volume was 1,068,654, leaps and bounds better than its full-day volume average of 34,688, after the Canadian telecom-testing-equipment maker reported first-quarter earnings that exceeded its own forecast.
Citigroup (NYSE: C) traded in 179,303,239 shares Thursday, about a third its daily average of 547,887,000. Prices for C were flat at $5.07.
SemiLEDS Corporation (Nasdaq: LEDS) fell 33 percent Thursday to $19.17 Volume for the stock was 4,007,597 shares, eight times its full-day average. The company said new pricing pressures will lead to slimmer profit and revenue for the newly-public company over the next three months.