Yahoo CEO Jerry Yang says he is willing to sell his company to Microsoft if the software maker returns to the bargaining table.

"To this day, I believe the best thing for Microsoft to do is to buy Yahoo," Yang said at the Web 2.0 summit in San Francisco.

Yang remarks came on the same day Google backed out of an internet advertising partnership that Yahoo had been counting on to accelerate its revenue growth and placate investors still upset with Yang's rejection of a $47.5 billion takeover bid from Microsoft.

Yahoo's stock price ended Wednesday at $13.92, far below the $33 per share that Microsoft offered in May. Microsoft withdrew the bid after Yang asked for more.