By Kate Gibson, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks fell Monday, positioning Wall Street for its greatest single-session drop so far this year, as uncertainty over Europe rattled investors and pushed Spanish bond yields higher.

"We had a heck of a run, but you can see the spillover from Europe today, and we're back to the same old story, with Italian and Spanish yields in particular spooking European markets," said Bill Stone, chief investment strategist at PNC Asset Management Group.

After last week rallying to its first close above 14,000 since October 2007, the Dow Jones Industrial Average (DJI) fell as much as 142 points during Monday's session, and was more recently off 131.66 points, or 0.9%, at 13,878.13.

The S&P 500 Index (SPX) declined 15.40 points, or 1%, at 1,497.77, with the technology hardest hit among its 10 major industry groups.

The Nasdaq Composite Index (RIXF) shed 41.86 points, or 1.3%, at 3,137.24.

For every share that rose, nearly four fell on the New York Stock Exchange, where 327 million shares traded as of 1:40 p.m. Eastern. Composite volume surpassed 1.9 billion.

Herbalife Ltd. (HLF) shares declined 2.4%. The supplement distributor said in a statement that it was demanding a correction from the New York Post after the newspaper reported the Federal Trade Commission was investigating it. Last month, hedge-fund manager Bill Ackman said he was betting against the stock, calling Herbalife a pyramid scheme.

Reduced ratings

Wal-Mart Stores Inc. (WMT) fell 1.6% after J.P. Morgan Chase downgraded the discount retailer to neutral from overweight.

Chevron Corp. (CVX) shed 1% after UBS AG downgraded the oil producer to neutral from buy.

Merck & Co. (MRK) declined 2% after Morgan Stanley cut the pharmaceutical firm to underweight from equal weight.

Oracle Corp. (ORCL) slid 2.7% after the business-software maker said it would buy Acme Packet Inc. (APKT) for $1.7 billion. Acme Packet shares jumped 22%.

In Spain, Prime Minister Mariano Rajoy is mired in a corruption scandal amid calls for his resignation from the opposition Socialist Party. Yields on Spain's 10-year government notes surged to above 5%.

Reforms implemented in Italy are viewed as at risk by the increasing popularity of Silvio Berlusconi, with the former prime minister a contender in general elections slated for later in the month.

Stocks maintained their losses after the Commerce Department reported factory orders rose a less-than-forecast 1.8% in December, illustrating a decline in nondurable goods that overcame advances in computers and construction equipment.

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