Systemax ( SYX - Get Report) climbed after the Port Washington, N.Y.-based direct marketer of computers and other items posted an increase in first-quarter earnings. The company reported income of $17.6 million, or 48 cents a share, compared with $2.6 million, or 7 cents a share, a year ago. Excluding a gain, net income would have totaled 36 cents a share. Sales increased 6.9% to $574.9 million. Shares gained $1.81, or 21.7%, to $10.16 recently.

InterVoice ( INTV) jumped 16% after Wedbush Morgan upgraded the stock to strong buy from buy. Shares of Intervoie were recently up 97 cents to $6.93.

Travelzoo ( TZOO - Get Report) fell after the New York-based Internet media company was downgraded by Stifel Nicolaus to sell from hold. Shares dropped $3.70, or 10.5%, to $31.60.

Lone Star Steakhouse & Saloon ( STAR - Get Report) lost ground after shareholder Barington Capital Group said a bid to take over the Wichita, Kan., restaurant operator "fails to provide adequate value" to stockholders. Lone Star has agreed to be acquired by affiliates of Lone Star Funds for $27.10 a share. Lone Star was down 44 cents, or 1.6%, to $27.49.

Other movers included pSivida ( PSDV), up 21.6% to $2.74, Radiant Systems , ahead by 14% to $11.72, and Harris & Harris ( TINY), a 12.7% gainer to $11.19.

NationsHealth fell 17% to $1.82, Genetic Technologies ( GENE) dropped 12% to $7.35, and Dover Downs ( DDE), was off 7% to $12.79.