Rubicon Technology Inc. (Nasdaq: RBCN) shares climbed 18.1% to $24.93. Share volumes topped four million, routing daily averages of 621,000, a day after the electronic-materials supplier projected a strong first quarter.

Citigroup Inc. (NYSE: C) dealt in 68.3 million shares Thursday, approaching a daily average of 539.1 million. Share prices crawled upward 0.1% to $4.91, after announcing some of its executives will be given stock grants.

Itron Inc. (Nasdaq: ITRI) shares fell 11.3% to $56.45, on volumes of 1.3 million shares, topping its daily average of 564,000, a day after the electric-grid provider projected guidance for 2011 beneath Wall Street’s estimates.