Shares in Google fell more than 4% after the closing bell in New York on Thursday because the internet search engine reported weaker ad sales.
Google reported a 16% rise in after-tax profit to $US3.23 billion in the second quarter.
However, it said prices for online ads had fallen, with the average revenue gained from internet users clicking on ads down 6%.
Meanwhile, Microsoft earnings also missed forecasts by analysts, resulting in the stock falling more than 4% after the bell.
Microsoft made $US4.5 billion in the second quarter, but it took a $US900 million charge relating to poor sales of its Surface tablet.
