By Rex Crum

Tech stocks put in a strong performance Wednesday as the sector came to life and erased the previous session's losses on a day in which AT&T said it would do away with unlimited wireless-data plans for its mobile-phone customers.

The Nasdaq Composite Index (RIXF), home to many leading tech stocks, climbed almost 59 points, or 2.6%, to close at 2,281. The Philadelphia Semiconductor Index (SOX) rose 3.6% and the Morgan Stanley High Tech 35 Index (MSH) added 2.4%.

Among leading tech stocks, hard-disk-drive maker Seagate Technology (STX), rose 92 cents a share, or 6.4%, to $15.38, Hewlett-Packard Co. (HPQ), was up $1.69, ore 3.7%, to close at $47.27 a share, and gains also came from Apple Inc. (AAPL), IBM Corp. (IBM) and Intel Corp. (INTC).

AT&T Inc. (T) rose 45 cents a share, or almost 2%, to close at $24.78 after the telecom giant said it would end its unlimited wireless-data plans and move toward a tiered billing structure.

Research In Motion Ltd. (RIMM) rose $2.82 a share, or 4.8%, to $61.85. Shaw Wu, an analyst with Kaufman Bros., said AT&T's tiered plan is a positive for RIM as its email network "enjoys a bandwidth efficiency advantage."

DivX Inc. (DIVX) climbed $1.84, or 26.5%, to $8.79 after Sonic Solutions Inc. (SNIC) said it would acquire the digital media company for $323 million. The deal values DivX at $9.83 a share, a 41% premium over its Tuesday closing price.

Separately, Sonic released preliminary fourth-quarter results. The company said it earned $1.2 million, or 4 cents a share, on $26.4 million, compared with earnings of $328,000, or a penny a share, on $32.2 million in sales a year ago.

Sonic's shares fell $1.12 or more than 9.5%, to $10.71.

 
 
Divx, Inc. (MM) (NASDAQ:DIVX)
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