Pressed to respond to concerns over government surveillance, companies like Facebook and Google have had to balance the image of privacy protection with their legal obligations.

T asked a group of authorities on subjects ranging from music to design to literature to profile some of the most game-changing men and women in their 20s.

Yahoo’s deal for Tumblr raises questions about its ability to make money by selling ads, among other thorny issues.

Yahoo’s move aims to make up for years of missing out on the growth of social networks and mobile devices.

Daniel S. Loeb, known for ousting Yahoo’s former chief executive, is pressing Sony to spin off part of its entertainment arm.

It may not be popular to say, but the incontrovertible fact remains that JPMorgan Chase has remained one of the best-performing banks on Wall Street under Jamie Dimon.

The billionaire Carl C. Icahn and Southeastern Asset Management, two of Dell’s biggest shareholders, seek to offer an alternative to a $24.4 billion takeover that they have criticized as “the great giveaway.”

OMAHA — A little under an hour into the question-and-answer session at Berkshire Hathaway ’s annual meeting here on Saturday, a name searing with history but now largely forgotten was mentioned: Henry E. Singleton. Mr. Singleton was, arguably, the Warren E. Buffett of the 1960s and ’70s, though hardly famous. His company, Teledyne, became a remarkably successful and huge conglomerate, with an assortment of related — and unrelated — businesses. L...

An investor invoked a predecessor of Warren E. Buffett when he questioned the Berkshire Hathaway chief about the company’s future.

Ten months after being pushed out as chief executive of Barclays, Diamond is trying to be something other than the “unacceptable face of banking.”