Apple is grabbing mobile ad share from Google, Yahoo, Microsoft and NokiaSeptember 27, 2010: 5:45 AM ET
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.
IDC's before-and-after numbers for the biggest losers below the fold.
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[Follow Philip Elmer-DeWitt on Twitter @philiped]