Interestingly, Mexico's FDI in the U.S. soared by 510% in 2006, while Canada's investments here actually declined by 70%, according to OFII.

FORBES: Magazine Article

According to OFII, the foreign investment estimates include equity capital, reinvested earnings and inter-company debt (U.S. subsidiaries borrowing from foreign parent companies).

FORBES: The World's Buying America

In fact, the U.K., France, the Netherlands, Germany and Japan account for 67% of all direct investment in the U.S, according to OFII.

FORBES: The World's Buying America

"The companies that are here are committed to being here and reinvesting into their U.S. operations, " says OFII Senior Vice President Nancy McLernon.

FORBES: The World's Buying America

The list, which OFII calls "The Insourcing 50, " is the only comprehensive tallying of how heavily foreign companies are investing in the United States.

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In 2000 and 2001, reinvested earnings actually fell and equity capital accounted for as much as 84% of total foreign investment, according to OFII's analysis.

FORBES: The World's Buying America

OFII's own analysis of the government's figures, also released Wednesday, shows an even broader long-term trend in foreign direct investment, often referred to in shorthand as FDI.

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"For all the drama and hand-wringing about China and Middle East investment, they haven't broken into the top 50, " says Todd Malan, OFII's president and chief executive officer.

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Not at all, says Malan, noting that people shouldn't make an "us vs. them" comparison between U.S. and foreign-based firms because so many companies with headquarters overseas provide jobs for Americans--5.1 million jobs, in fact, according to OFII.

FORBES: The Insourcing 50