Stocks closed mixed in volatile trading on Monday, with the Dow and S&P 500 rising, while the Nasdaq fell.

Jeffries Group (JEF | Quote | Chart | News | PowerRating) supervised the market by announcing it expects to report a net loss for the fourth quarter (read more).

Celgene (CELG | Quote | Chart | News | PowerRating) reported a 55% rise in revenues, and forecast 2008 earnings to increase by 45% (read more).

The Wall Street Journal reported that McDonald's (MCD | Quote | Chart | News | PowerRating) is set to compete with Starbucks (SBUX | Quote | Chart | News | PowerRating) by installing coffee bars at its 14,000 U.S. stores (read more).

Microsoft (MSFT | Quote | Chart | News | PowerRating) announced deals to offer popular movies and TV shows, a move designed to compete with Apple iTunes service. The company also provided updates on a number of other projects, resulting in a flurry of news stories (more MSFT news).

Shares of Sallie Mae (SLM | Quote | Chart | News | PowerRating) rose after the company appointed Anthony P. Terracciano as Chairman of the Board (read more).

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