By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks sold off on Tuesday as the dumping of momentum plays, such as Twitter Inc. and economically sensitive stocks, including some bank stocks, spreads to broader markets. Financials and consumer discretionary stocks were hardest hit on the S&P 500.

Even deal news, generally a positive for the market, failed to lift prices. The calendar also didn't provide its usual support; Tuesdays on the whole have been the strongest part of the week this year.

The S&P 500 (SPX) ended the day at session lows, down 16.94 points, or 0.9%, at 1,867.72, with the financial and consumer-discretionary sectors leading the decline. The Dow Jones Industrial Average (DJI) dropped 129.53 or 0.8% to 16,401.02, with 27 of 30 members of the index closing in the red.

The Nasdaq Composite (RIXF) finished the day 57.30 points, or 1.4%, lower at 4,080.76.

Read the recap of MarketWatch's live blog of today's stock-market action.

Joe Peta, managing director at Novus, a financial technology company, says the selloff on the Nasdaq Composite was prompted by two specific events: Expiration of the lock-up in Twitter Inc. shares and public denouncement of the Athenahealth stock by David Einhorn at the Ira Sohn investment conference.

"There is a clear rotation out of stocks that accumulated froth -- namely biotech, Web 2.0 and social network companies. This earning season showed that investors care about profits and unprofitable companies were sold off to bring their PE ratios to more normal levels," he added.

"Today's trading is very atypical. There is very little volume, and deal news, which usually a positive for markets, is being ignored," said Kim Caughey Forrest, senior equity analyst at Fort Pitt Capital.

The sole U.S. economic report covered the trade deficit, which narrowed in March to $40.4 billion, slightly above the consensus of $40 billion.

Whole Foods Markets tumbles on earnings miss

Whole Foods Market Inc. (WFM) shares slumped 10.3% in aftermarket action, after the grocer cuts outlook for sales and profits.

Groupon Inc (GRPN) shares fell 3.3% in extended trading hours on top of 2.5% losses on Tuesday after the company reported a wider loss than expected.

Shares in Walt Disney Company (DIS) rose 2.2% after quarterly results came above Wall Street's expectations.

Twitter Inc. (TWTR) shares tumbled 15% as hundreds of millions of shares held by insiders became available for sale in the open market.

Tesla Motors (TSLA) shares lost 4% ahead of the earnings results scheduled for Wednesday after the closing bell. Read also: Momentum stocks are taking a beating.

In deal news, Merck (MRK) agreed to sell its consumer-products business, including the allergy-treatment Claritin and nasal decongestant Afrin, to German drug maker Bayer AG for $14.2 billion. Shares fell 2.5%. Also read: Why the deal isn't helping Merck shares.

Office Depot Inc. shares (ODP) surged 16% to $4.83, after the electronics retailer raised its outlook for 2014 operating profit and said it plans to close at least 400 U.S. stores by the end of 2016.

Shares of Athenahealth (ATHN) fell 14%, after David Einhorn of Greenlight Capital said at a conference Monday that the health-information technology firm is "overpriced" and "caught up in a bubble."

American International Group (AIG) shares dropped 4.1% after the insurer reported a substantial fall in first-quarter profit late Monday.

Discovery Communications, Inc. (DISCA) shares dropped 3.9% after disappointing first-quarter results. The owner of Discovery Channel and Animal Planet said profit edge down 0.4% as higher expenses cut into revenues.

European stocks end lower

European stocks reversed earlier gains and closed mostly lower.

On Tuesday, the Organization for Economic Cooperation and Development said the European Central Bank should immediately cut its benchmark interest rate, to end a period of too-low inflation in the euro zone.

Asian stocks were slightly higher, with Australia up after the country's central bank held interest rates steady. Markets in Japan, South Korea and Hong Kong were closed.

In the commodities markets Tuesday, gold (GCM4) futures fell slightly. Crude for June delivery (CLM4) gained slightly but still remained below the $100 a barrel level. Meanwhile, the pound (GBPUSD) bought $1.6970 and traded at levels not seen since at least 2009 after strong U.K. services data.

More must-reads from MarketWatch:

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