— March 20: Yahoo says it has bought Silicon Valley startup Jybe so it can bring back five of its former engineers to help the Internet company build better mobile applications.
— March 25: Yahoo says it is buying London startup Summly, the maker of a mobile application created by teenage entrepreneur seeking an easier way to read news stories and other content on the smaller screens of smartphones.
— April 16: A drop in Yahoo's ad revenue during the first three months of the year overshadows a 36 percent increase in earnings that topped analyst forecasts. Mayer says the company is engaged in a "series of sprints" that will culminate in more robust growth.
— April 18: Yahoo releases new mobile apps.
— April 25: Yahoo says Chairman Alfred Amoroso will become the eighth director to leave since early 2012. The departure is effective June 25. Amoroso is giving up the chairmanship immediately. Maynard Webb Jr. will handle the duties on an interim basis. Amoroso, who became chairman 11 months earlier after Thompson left, says he had intended to serve as chairman for only a year.
— May 20: Yahoo announces a deal to buy online blogging forum Tumblr for $1.1 billion. Mayer is betting that Tumblr will provide Yahoo with a captivating hook to reel in more traffic and advertisers on smartphones and tablet computers. More than half of Tumblr's users connect through the mobile app and engage in an average of seven sessions per day.
— July 16: Yahoo says earnings are still rising, but the second-quarter results also highlight the challenges facing the company as it loses ground to Google and Facebook in online advertising. After stripping out ad commissions, Yahoo's revenue came to $1.07 billion in the April-June period. That is slightly below analyst projections and marks a 1 percent decline from last year. It's the first time that Yahoo's net revenue has fallen since Mayer took over.