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.

Koch Industries recently brought on Angela Redding, a consultant based in Salt Lake City, to analyze the media environment and assess opportunities. Ms. Redding, who previously worked at the Charles G. Koch Charitable Foundation, did not respond to requests for comment.

“As an entrepreneurial company with 60,000 employees around the world, we are constantly exploring profitable opportunities in many industries and sectors. So, it is natural that our name would come up in connection with this rumor,” Melissa Cohlmia, a spokeswoman for Koch Companies Public Sector, said in a statement last month.