Keynote Systems Inc. (Nasdaq: KEYN) shares rallied 24.6 percent to $18.67, on volume of 330,784 shares, or better than four times its normal daily average. Late Tuesday, the maker of online-monitoring systems reported first-quarter earnings that beat consensus expectations.

Citigroup Inc. (NYSE: C) took its place among the volume leaders early Wednesday, trading in 81.3 million shares, catching up on its full-day average of 553.2 million. Share prices for C were up 0.6 percent to $4.85, on word from the Treasury Dept. that the nation is set to record a net $312.2 million from its sale of its final 465.1 million warrants to purchase common shares of C.

MIPS Technology (Nasdaq: MIPS) dipped 11.6 percent to $13.32 Wednesday. Volume for the stock was 3.5 million shares, already surpassing its daily average of 3 million. Tuesday, MIPS declared it earned $6 million, or 11 cents per share, compared with $3.3 million, or seven cents per share, a year ago.