Apple is grabbing mobile ad share from Google, Yahoo, Microsoft and Nokia

Updated: Sep 27, 2010 9:45 AM UTC

Smaller rivals like Jumptap and Millennial Media are also gaining, according to IDC

The pie chart at right is somewhat premature, given that it is IDC's best guess -- via
Bloomberg Businessweek
-- of what the $500 million U.S. mobile advertising market will look three months from now.

But it's an indication of how the winds have shifted. Apple (aapl), which had 0% share of the market before it bought Quattro Wireless in January and launched iAd in June, will end the year at 21%, according to IDC.

Where did that share come from? Chiefly from Google (goog), Yahoo (yhoo), Microsoft (msft) and Nokia (nok), according to the Businessweek piece.

IDC's before-and-after numbers for the biggest losers below the fold.

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[Follow Philip Elmer-DeWitt on Twitter @philiped]