In its latest in a string of acquisitions, security software maker


(SYMC) - Get Symantec Corporation Report

announced Tuesday it is acquiring imaging technology firm

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for about $150 million.

The acquisition, expected to close by the end of the year after winning shareholder approval, complements Symantec's Norton antivirus products with a second line of defense against computer viruses and worms, Symantec said in a press release.

In addition to using imaging technology to better build, protect and recover computer networks, Orem, Utah-based PowerQuest, a privately held company, makes products that allow customers to add, reconfigure and manage storage devices. The acquisition is part of Symantec's effort to boost sales to corporations.

Shares of Symantec closed up $3.01, or 4.79%, at $64.79, before climbing farther to $65.74 in after-hours trading.