The AdMob acquisition has given Google the chance to turn their ad network into a powerhouse on the mobile space as well. According to a research by IDC, the revenues of the two companies in 2009 constituted over 25% of the entire mobile ad market. Here are the biggest mobile ad networks in the US by revenue

1. Millennial Media : $51 million
2. AdMob : $40 million
3. Yahoo : $32 million
4. Google : $28 million
5. Microsoft : $23 million
6. Quattro Wireless : $21 million
7. JumpTap : $11 million
8. AOL : $7 million
Others : $9 million

To compare this with our earlier list based on unique visitors written back in August 2009, click here.

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