By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks fluctuated after reports on U.S. service-sector activity, which was lower than expected, and factory orders, which saw a higher-than-anticipated increase.

The Dow Jones Industrial Average pared gains and was 5 points higher at 16,473.11. The S&P 500 was down less than a point at 1,831.30. The Nasdaq Composite lost 13 points, or 0.4%, to 4,112.12, sunk by its biggest component Apple Inc.

The Institute for Supply Management said Monday its services index for December decelerated to 53% from 53.9% in November. Economists polled by MarketWatch expected a 55% reading. Orders for goods produced in U.S. factories jumped 1.8% in November, led by orders for durable goods, the Commerce Department reported Monday. Economists surveyed by MarketWatch expected orders to rise by 1.6%.

Last week, the ISM manufacturing data showed that the increase in new orders last month was the largest in more than two-and-a-half years, while manufacturing employment accelerated.

The overall improving economy, along with falling unemployment rates and an improving housing market, last month prompted the Federal Reserve to begin tapering its monthly asset-buying program by $10 billion to $75 billion last month.

The changing of the guard at the Federal Reserve is expected to be finalized Monday, with the U.S. Senate set to vote on the nomination of Janet Yellen, currently the Fed's vice chair, to lead the central bank.

Boeing Co. (BA) pared earlier gains and was 0.7% higher. Late Friday, Boeing's largest union voted to accept a new contract that will keep manufacturing for the planned 777X and its wings in Washington state. Analysts at Bernstein Research reiterated the stock's outperform rating and raised the target price to $165 from $156, noting that under the terms of the new agreement there will be no strikes for the next ten years.

Shares in SolarCity Corp. (SCTY) soared 12.4% after analysts at Goldman Sachs upgraded the stock to buy. Analysts at Goldman Sachs also downgraded First Solar, Inc. (FSLR) from buy to sell, sending shares down 8.5%.

Twitter Inc. (TWTR) shares dropped 7.3% after Morgan Stanley cut shares of the social media company to underweight from equal-weight, with a price target of $33. "As competition for online ad dollars intensifies, we guide investors to Google and Facebook, dominant platforms with more attractive risk/reward," Analyst Scott Devitt wrote.

Sirius XM Holdings Inc. (SIRI) shares soared late on Friday and continue to rise on Monday, trading up 6.6% after Liberty Media offered to buy the satellite radio company in a stock swap that would value the company at $3.68 a share. Liberty already holds a 52% stake in Sirius.

Shares in Apple Inc. (AAPL) were down 0.8%, after losing 2.2% on Friday in the wake of a rating downgrade. The heaviest-weighted component of the Nasdaq Composite dragged the index down.

The battle among the men's clothing retailers continued Monday, as Men's Wearhouse Inc. (MW) said it began a cash tender offer worth roughly $1.6 billion, in which it would buy Jos. A. Bank Clothiers Inc. (JOSB) shares from current holders at $57.50 a piece. The two clothiers have been exchanging buyout offers for months.

Jos. A. Bank shares were up 4.4% while Men's Wearhouse was up 4.3%.

Asian stocks ended lower after a rising yen hit Japanese equities and concerns over new listings weighed on Chinese stocks. Europe stocks were mixed.

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