Small-Cap Winners & Losers: InterDigital

Updated from 12:52 p.m. with new stock prices

Small-cap stocks were experiencing modest gains alongside the broader market as bulls entered the markets early Tuesday. The Russell 2000 was gaining 3.6% at 682.07, and the S&P SmallCap 600 was rising 3.1% to 358.98.

Shares of Altair Nanotech(ALTI Quote) were ticking higher by 33.1% to $1.93 during Tuesday's trading session. The Reno, Nev.-based developer of nanomaterial and titanium dioxide pigment technologies publicized the completion of a demonstration and validation program for a new battery system purchased by AES Corporation(AES Quote). In a Yahoo! Finance interview, Terry Copeland, the president and CEO of Altair, said that the "positive AES results validate the immense opportunities in the utility sector."

San Diego-based discount retailer PriceSmart(PSMT Quote) advanced 27.2% to $23.43. It reported a significant increase in profits vs. a year earlier for the quarter ending May 31, with net income rocketing to $10.6 million, or 36 cents per share, from $5.2 million, or 8 cents a share. The warehouse club operator cited a litigation settlement and higher club revenues as advancing gains. If that was not enough, PriceSmart also said its June same-store sales rose 20%. ...