U.S. stock index futures slipped on Wednesday, indicating the S&P 500 may snap a three-day winning streak after weaker-than-expected euro zone data and ahead of a report on the U.S. housing market.

* European shares fell for a second straight session as recession concerns increased after data showed the euro zone's service sector unexpectedly shrank and amid residual worries about Greece despite its success in getting a bailout.

* The FTSEurofirst 300 <.FTEU3> index of top European shares was down 0.8 percent and the euro edged down 0.1 percent.

* Investors will look to the National Association of Realtors' January existing home sales at 10 a.m. EST (1500 GMT). Economists in a Reuters survey forecast 4.65 million annualized unit total versus 4.61 million in December.

* S&P 500 futures fell 2.8 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures lost 5 points, and Nasdaq 100 futures shed 4.75 points.

* Dell Inc slumped 6.6 percent to $17 in premarket trading after the world's No. 3 personal computer maker forecast

revenue below expectations after the close on Tuesday.

* Fellow computer maker Hewlett-Packard Co is set to report earnings later Wednesday. The market expects a profit of 87 cents per share, down from $1.36 one year ago.

* Other companies due to announce results later in the day include Express Scripts Inc , TJX Cos Inc and Analog Devices Inc .

* According to Thomson Reuters data through Tuesday morning, of the 418 companies in the S&P 500 that have reported earnings, 64 percent have topped analysts' expectations.

* Wells Fargo & Co is buying an energy lending business from BNP Paribas SA in the U.S. bank's latest acquisition from a European bank seeking to shrink its balance sheet.

* PSA Peugeot Citroen SA
, Europe's second biggest carmaker, said it is in talks over possible alliances but did not name possible partners. According to media reports, it was in advanced discussions with General Motors Co .

* Asian shares eked out modest gains on doubts about Greece and concerns grew about rising oil prices.

* On Tuesday the Dow Jones industrial average <.DJI> finished up 15.82 points, or 0.12 percent, at 12,965.69 after briefly breaking 13,000 for the first time since May 2008. The Standard & Poor's 500 Index <.SPX> ended up 0.98 point, or 0.07 percent, at 1,362.21. The Nasdaq Composite Index <.IXIC> was down 3.21 points, or 0.11 percent, at 2,948.57.

(Reporting By Chuck Mikolajczak; editing by Jeffrey Benkoe)