By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- The U.S. stock market extended a four-day rally Wednesday boosted by an upbeat economic outlook from St. Louis Federal Reserve President James Bullard and positive data from overseas.

The S&P 500 (SPX) added 6.4 points, or 0.4%, to 1,826.13, which leaves the benchmark index only 1.2% below its all-time high reached last month.

The Dow Jones Industrial Average (DJI) was up 39 points, or 0.4% at 16,032.70.

The Nasdaq Composite (RIXF) rose 20 points, or 0.5% to 4,211.48. After the previous day's rally, the tech-heavy index turned positive for 2014 and is now 0.8% higher for the year.

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Speaking in New York, Bullard said he sees a 3% or better growth in 2014 and that decline in unemployment rate signals real job gains.

The Bank of England's encouraging outlook for the U.K. economy and stronger-than-expected Chinese trade data have aided sentiment.

Stocks rallied during the previous session after Federal Reserve Chairwoman Janet Yellen pledged to keep interest rates low and said the Fed would continue to taper the pace of bond purchases if the economy keeps improving.

Among corporates, Deere(DE) shares initially rose after the farm machinery maker reported first-quarter earnings, which beat forecasts. But shares fell 1% shortly after the market open.

Shares of DaVita HealthCare Partners Inc.(DVA) rose 7.4% after late Tuesday reporting better-than-expected fourth-quarter results and posting an update profit outlook for 2014.

Cisco (CSCO) will report after the market close and analysts expect second-quarter earnings of 46 cents a share. Shares were unchanged on Wednesday.

In other markets, European stocks rose for a sixth-straight session, while the British pound rose against the dollar after the Bank of England raised its forecast for U.K. economic growth in 2014 to 3.4%, from a prior forecast of 2.8%. The central bank also signalled it won't hike rates until 2015 because there is too much spare capacity in the labor market.

The Chinese data triggered losses for the Aussie dollar against the U.S. dollar (AUDUSD), while gold (GCH4) continued its upward march building on a 7% rise so far this year. Oil(CLH4) recaptured the $100 mark after a below-expectations rise in crude supplies in data released Tuesday.

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