NEW YORK ( TheStreet) -- Security specialist AVG Technologies ( AVG) was a big winner in premarket trading on Thursday, rising 7% to $10.70 after its strong second-quarter results, released on Wednesday.

The Symantec ( SYMC - Get Report) rival, which went public earlier this year, ended the quarter with 128 million customers, a 31% hike on the prior-year's quarter.

AVG also raised its full-year revenue forecast to between $336 million and $344 million, up from its prior forecast of $327 million to $335 million. Excluding items, the company also expects full-year earnings of $1.15 to $1.20 a share, above its prior outlook of $1.08 to $1.14 a share.

Sirius XM ( SIRI - Get Report) shares were flat at $2.15, although the satellite radio giant was one of the most active premarket Nasdaq stocks on share volume of 1,264,574.

Electronic Arts ( EA - Get Report), which reported preliminary first-quarter results on Tuesday, tumbled 10% to $10.51 before market open.

Rival Activision Blizzard ( ATVI - Get Report), which reports its second-quarter results after market close, Thursday crept up 0.25% to $11.85.

--Written by James Rogers in New York.

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