U.S. stock futures declined as Dell  tumbled and reports from Europe and China fueled concern about the global economy.

Dell, the third-largest maker of personal computers, sank  after its sales forecast missed analysts’ estimates.

Global stocks fell as a gauge of European services and manufacturing output unexpectedly shrank in February. China’s manufacturing may shrink for a fourth month, according to data from HSBC Holdings Plc and Markit. In the U.S., sales of previously owned homes probably rose last month to the highest level since May 2010, analysts said before a National Association of Realtors report today.

Global stocks:

Nikkei  9,554 +90.98 +0.96%

Hang Seng 21,549.28 +70.56 +0.33%

Shanghai Composite 2,403.59 +22.16 +0.93%

FTSE  5,913.2 -15.00 -0.25%

CAC  3,453.38 -11.86 -0.34%

DAX 6,868.08 -40.10 -0.58%

Crude Oil $105.96 (-0,3%).

Gold $1754.00 (-0,2%).

Asian stocks swung between gains and losses as concern that oil near a nine-month high will crimp economic growth was countered by a surge in Alibaba.com Ltd. and gains by telecommunications companies.

Nikkei 225 9,554 +90.98 +0.96%

Hang Seng 21,549.28 +70.56 +0.33%

S&P/ASX 200 4,293.11 +1.91 +0.04%

Shanghai Composite 2,403.59 +22.16 +0.93%

Alibaba, China’s No. 1 e-commerce web portal, jumped 42 percent after its parent offered to privatize the company.

NTT DoCoMo Inc. , Japan’s largest mobile-phone operator by market value, climbed 2 percent after a report it expanded capacity to prevent service glitches.

Kumho Petro Chemical Co. , a Korean maker of synthetic rubber and chemicals, slid 4.3 percent as crude oil remained above $105 a barrel. Wilmar International Ltd. , the world’s No. 1 palm-oil processing company, dropped 11 percent after its earnings fell short of analyst forecasts.

Resistance 3: Y81.50 (Jul 2011 high)

Resistance 2: Y80.55 (50.0% FIBO Y75.55-Y85.50)

Resistance 1: Y80.25 (Aug 4 high)

The current price: Y80.07

Support 1: Y79.90 (support line from Feb 14)

Support 2: Y79.35 (Feb 20 low)

Support 3: Y78.65/75 (area of Feb 16-17 lows)

Resistance 3 : $1.5925 (Feb 8 high)

Resistance 2 : $1.5880 (Feb 20 high)

Resistance 1 : $1.5825 (high of the American session on Feb 21)

The current price: $1.5780

Support 1 : $1.5760 (session low)

Support 2 : $1.5730 (Feb 10 low)

Support 3 : $1.5685 (low of the Asian session on Feb 14)