By Anora Mahmudova and Carla Mozee, MarketWatch

NEW YORK (MarketWatch) -- The U.S. stock market ended a choppy Monday trading session lower as investors appeared to book profits after last week's rally. Small-cap and tech stocks led trading declines.

The Russell 2000 (RUT) fell 10.10 points, or 0.9%, to 1,094.65 while the Nasdaq Composite (RIXF) lost 20.82 points, or 0.5%, to 4,454.80.

The S&P 500 (SPX) closed 3.1 points, or 0.2%, lower at 1,964.82 as the Dow Jones Industrial Average (DJI) fell 17.72 points, or 0.1%, to 16,991.97.

In the absence of economic and corporate news, stock prices gyrated as indexes hovered near key technical levels. The S&P 500 fell below its 50-day moving average last week and has struggled to move above that threshold. Also read: U.S. stocks test key technical levels

Sam Stovall, equity strategist at S&P Capital IQ, attributed weakness in stock prices to cautious investing (meaning investors aren't inclined to take strong directional bets) ahead of earnings season.

Stovall added that people are saying, 'We're probably due for some sort of pullback,'" and chart watchers have noticed the S&P 500 has been making lower highs in the last two weeks.

Stocks on the move: Hewlett-Packard (HPQ) shares climbed 4.7% as the company said it plans to split into two, separating businesses: personal-computer and printer businesses from its corporate hardware and services operations.

Medical technology company Becton, Dickinson (BDX) has reached a deal to buy CareFusion(CFN) for $12.2 billion in cash and stock. CareFusion shares rallied 23%.

Tesla Motors(TSLA) is set to unveil its Model 3 mass-market car and new versions of its Model S sedan at an event on Thursday, according to Global Equities Research analyst Trip Chowdhry. Tesla shares were up 2.1%.

H&R Block (HRB) shares fell 5.5% after the tax services company said regulatory approval for the sale of H&R Block Bank won't be completed in the current year.

Sunesis Pharmaceuticals (SNSSD) sank 78% after the company said a late-stage trial of a cancer treatment failed to meet its primary goals. (Read more in Movers & Shakers http://www.marketwatch.com/story/container-store-helen-of-troy-in-focus-2014-10-03.)

Other markets: The dollar (DXY) pulled back against major rivals after Friday's climb. Japan's Nikkei Average and Hong Kong's Hang Seng Index each rose more than 1%, and European stocks closed higher.

Falling dollar propped up commodity prices. Oil futures (CLX4) settled higher, while gold prices (GCZ4) rallied $14 an ounce, and settled above 1,200 an ounce. Gold on Friday turned negative for the year.

Vic Reklaitis contributed to this report.

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