March has proved a very static month in the search market. Google and Bing stayed flat while only Yahoo lost 0.1 percentage points compared to February. Year over year, both Google and Bing increased their market share in the US, while Yahoo has lost quite a bit.
Google ended March with 66.4 percent of the US search market, the core market comScore tracks
which only includes the top five search engines in the country. Those top five search engines account for almost all of the search activity online, so the numbers are a good indicator of overall market share.
Google had 65.7 percent market share in March 2011. Bing had 15.3 percent of the market in March, same as in February, but quite a bump from the 13.9 percent it saw in 2011 in the same month. Yahoo went from 13.8 percent in February to 13.7 percent in March and down from 15.7 percent a year before.