Thursday's Tech Winners & Losers

GameStop rises after being added to the S&P 500 Index.
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Updated from 2:13 p.m. EST with new stock prices

Tech stocks extended their gains Thursday as the major indices moved higher despite a mixed November sales report from retailers.

Video-games retailer

GameStop

(GME) - Get Report

gained 3% after Standard & Poors said it will add the stock to the S&P 500 index to replace

Dow Jones

(DJ)

.

Dow Jones is being acquired by

News Corp.

(NWS) - Get Report

, another S&P 500 index member. S&P said it is making the change pending regulatory approval for the Dow Jones-News Corp. deal. GameStop was up $1.75 to $59.65.

Chip designer

Rambus

(RMBS) - Get Report

rose 7.4% after it said that the U.S. Securities and Exchange Commission has ended an informal probe into the company's historical stock options grant practices without recommending any enforcement action against the company. Rambus gained $1.46 to $21.30.

Programmable-chip maker

Xilinx

(XLNX) - Get Report

rose 2.9% after the company said it will

meet its financial targets midway through its fiscal third quarter. Xilinx said it expects revenue in the current quarter to increase 2% to 6% sequentially, suggesting a range of $453.8 million to $471.5 million, compared to analysts' expectations of $462.7 million. Xilinx was up 64 cents to $22.65.

BlackBerry maker

Research In Motion

(RIMM)

gained $2.92, or 2.9%, to $103.88.

Dell

(DELL) - Get Report

rose 2.6% after the company said it will start selling its computers at

Best Buy

(BBY) - Get Report

stores starting January, further moving away from its model of direct-to-consumer sales.

Dell's relationship with Best Buy comes on the heels of recent partnerships with

Wal-Mart

(WMT) - Get Report

and

Staples

(SPLS)

, among other stores. The latest deal, however, will miss the big holiday sales season. Dell was up 64 cents to $24.95. Best Buy was up 89 cents, or 1.7%, to $52.71.

E-commerce company

Digital River

(DRIV) - Get Report

fell after a Wall Street analyst downgraded the stock to hold from buy. A Deutsche Securities analyst said the company had done little to diversify its business away from its biggest customer,

Symantec

(SYMC) - Get Report

. Digital River was down $1.16, or 3.1%, to $36.78.