Article: Zacks Upgrades and Revisions Strategy Highlights: Lockheed Martin, Mettler-Toledo, Apache, and White Mountains Insurance.

CHICAGO -- Earnings estimate revisions are the most powerful force impacting stock prices. Couple that with the proven benefits of upgrades in ratings from brokerage firms and you have a strategy that delivered a +23.3 return in 2006. Four stocks meeting this screen's exclusive criteria are Lockheed Martin Corporation (NYSE: LMT), Mettler-Toledo International, Inc. (NYSE: MTD), Apache Corp. (NYSE: APA), White Mountains Insurance Group Ltd. (NYSE: WTM). View the entire list of stocks for the Upgrades and Revisions Profit Track at http://at.zacks.com/?id=1844

Here are details on four companies currently identified by the Upgrades and Revisions Profit Track:

Lockheed ...

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