U.S. stocks wavered between modest gains and losses after Friday's open following an upbeat report on U.S. jobs growth in December. The Dow Jones Industrial Average was flat at 19,903. The S&P 500 index shed two points, or 0.1%, to 2,268. The Nasdaq Composite Index rose four points, or 0.1%, to 5,491. Shares of Amgen Inc. jumped at the open after a federal judge ruled that two of the firm's rivals must pull a competing cholesterol drug off the market. Shares of Ruby Tuesday Inc. plunged after the restaurant chain reported a wider-than-expected second-quarter loss.
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