Infosonic ( IFON) shares jumped more than 19% on news the San Diego-based company will continue distributing Samsung wireless devices in Argentina, Uruguay and Paraguay through year-end. Shares were rising 96 cents to $5.96.

Microvision ( MVIS) surged after it announced it had developed a full-color projection display that's small enough to fit into a cell phone. The Redmond, Wash., company will demonstrate the device at the Consumer Electronics Show in Las Vegas next week. Shares were gaining 53 cents, or 17.3%, to $3.60.

Witness Systems ( WITS) rose on preliminary results that topped Wall Street estimates. The Georgia-based software company said it brought in $63 million in revenue in the fourth quarter and $220 million in 2006. Analysts polled by Thomson Financial were looking for $58.2 million and $211.8 million for the quarter and year, respectively. The company also issued 2007 revenue guidance -- between $250 million and $255 million -- that beats the $246.8 million consensus. Shares were up $2.05, or 11.7%, to $19.56.

Matrix Service ( MTRX) gained after profits more than tripled for the quarter ended Nov. 30. The company, which sells construction and maintenance services to the petroleum and power industries, said it earned $8.1 million, or 31 cents a share, compared with $2.2 million, or 10 cents a share, a year ago. Revenue climbed to $166.4 million from last year's $126.8 million. Shares were climbing $1.58, or 10.5%, to $16.68.

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