Lockheed Martin (NYSE: LMT), the giant defense stock that makes America's vaunted F-16, F-22, and F-35 fighter jets, tumbled 5.5% through 11:40 a.m. ET Wednesday morning. And why? As Bloomberg reports,

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Lockheed Martin shares are climbing Friday amid heightened geopolitical tensions in the Middle East. Increased demand for military hardware is anticipated following recent Israeli strikes against Iran.

Israel's strikes on Iran sent most stocks down on Friday. Israel was the first country to fly the F-35 in combat. Shares of defense contractor Lockheed Martin (NYSE: LMT) rallied 3.5% on Friday, even though the S&P 500 (SNPINDEX: ^GSPC) was down 1.

Bloomberg journalists discuss today's biggest winners and losers in the stock market. Listen for analysis on the companies making news on Wall Street.

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