“It was ‘How do we make sure our voice is being heard?’ ”

Guests at the Aspen seminar included Philip F. Anschutz, the Republican oil mogul who owns the companies that publish The Washington Examiner, The Oklahoman and The Weekly Standard, and the hedge fund executive Paul E. Singer, who sits on the board of the political magazine Commentary. Attendees were asked not to discuss details about the seminar with the press.

A person who has attended other Koch Industries seminars, which have taken place since 2003, says Charles and David Koch have never said they want to take over newspapers or other large media outlets, but they often say “they see the conservative voice as not being well represented.” The Kochs plan to host another conference at the end of the month, in Palm Springs, Calif.

At this early stage, the thinking inside the Tribune Company, the people close to the deal said, is that Koch Industries could prove the most appealing buyer. Others interested, including a group of wealthy Los Angeles residents led by the billionaire Eli Broad and Ronald W. Burkle, both prominent Democratic donors, and Rupert Murdoch’s News Corporation, would prefer to buy only The Los Angeles Times.

The Tribune Company has signaled it prefers to sell all eight papers and their back-office operations as a bundle. (Tribune, a $7 billion media company that also owns 23 television stations, could also decide to keep the papers if they do not attract a high enough offer.)

Image Charles G. Koch Credit... Mike Burley/Topeka Capital-Journal via Associated Press

Koch Industries is one of the largest sponsors of libertarian causes — including the financing of policy groups like the Cato Institute in Washington and the formation of Americans for Prosperity, the political action group that helped galvanize Tea Party organizations and their causes. The company has said it has no direct link to the Tea Party.

This month a Koch representative contacted Eddy W. Hartenstein, publisher and chief executive of The Los Angeles Times, to discuss a bid, according to a person briefed on the conversation who spoke on the condition of anonymity because the conversation was private. Mr. Hartenstein declined to comment.