Bing garnered 13.9% of all U.S. search traffic, up from 13.6% in July, according to Nielsen. Yahoo agreed to outsource search to Microsoft under an alliance struck last year. The integration went live Aug. 24; Bing is now serving up search results on Yahoo sites. Google, meanwhile, made a slight gain, as its share increased from 64.2% to 65% in August. Microsoft and Yahoo announced the alliance on July 29, 2009.”]
Source: https://www.darkreading.com/database-security/bing-overtakes-yahoo-in-search