NEW YORK (Bloomberg) — Microsoft Corp.'s Bing overtook Yahoo! Inc. last month for the first time as the No. 2 search-engine provider in the US, according to Nielsen Co.

Bing had 13.9 percent of searches, while Yahoo had 13.1 percent, Nielsen said in an e-mailed statement. Google remained in first place with 65 percent. Microsoft and Yahoo, trying to expand search-based advertising revenue, have teamed up to take on Google. Under their 10-year deal, Yahoo plans to use Bing's search technology on its sites. The U.S. search-ad market may grow 16 percent this year, faster than the broader online advertising market, which is estimated to expand 11 percent to $25.1 billion, according to EMarketer Inc. in New York.