Shares of Northrop Grumman tumbled while Lockheed Martin stock rallied following news that the companies' proposed $10.7 billion merger had been abandoned. Analysts said the news of the deal's collapse--under pressure from government opposition on antitrust grounds--removed a cloud of uncertainty that had been hanging over Lockheed.
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Discuss: Short Take: Northrop down, Lockheed rallies on news of nixed merger
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