Microsoft's Bill Gates lost his title as America's top philanthropist to Intel co-founder Gordon E. Moore.

NEW YORK (CNN/Money) - Bill Gates may be the richest man in the world, but the Microsoft co-founder is no longer considered America's top giver, according to an annual ranking of the top U.S. philanthropists published Thursday.

Known for co-founding the microchip firm Intel (Research), Gordon E. Moore and his wife Betty unseated Gates and his wife Melinda in BusinessWeek's fourth-annual list of the America's "50 Most Generous Philanthropists."

Basing their rankings on public records and interviews with donors, the magazine estimates that the Moores have given or pledged over $7 billion between 2001 and 2005.

While the Gates have given significantly more, nearly $28 billion to date, Gordon and Betty Moore have given a higher percentage of their net worth, according to BusinessWeek.

Making his debut on the list this year is John Marks Templeton at No. 11, the famed investor who started Templeton Mutual Funds, which is now Franklin Templeton Investments.

Recently re-elected New York City Mayor Michael Bloomberg took the 13th spot, giving $528 million between 2001 and 2005, while talk-show host Oprah Winfrey moved from No. 40 to No. 32 with her donations totaling $212 million.

Ted Turner, the founder of CNN ranked 16th with a total of $457 million in gifts and pledges since 2001, while Microsoft co-founder Paul Allen slipped 16 spots to No. 25.

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