Warren Buffett
Warren Buffett has been diagnosed with prostate cancer, Reuters reported Tuesday afternoon. REUTERS

(Reuters) - Berkshire Hathaway Inc is adding to its shareholdings of two U.S. companies amid a market dip, billionaire investor Warren Buffett said on Monday.

Buffett, Berkshire's controlling shareholder, also forecast record results this year for Berkshire's largest non-insurance businesses, among them the railroad BNSF and the utility MidAmerican.

In an interview on cable television network CNBC from just outside his conglomerate's home base in Omaha, Nebraska, he dismissed the dip in European shares after weekend elections in France and Greece.

It's going to be very, very difficult to resolve their problems, he said of theeuro zone countries, but he insisted they would do so eventually.

Buffett declined to identify the two portfolio stocks Berkshire was purchasing more of. He said Berkshire spent $60 million buying stocks last Friday would buy more today. It was not clear if the $60 billion was spent on just two stocks.

Over the weekend, Berkshire held its annual shareholder meeting in Omaha, a festival-like event that draws nearly 40,000 people for an hours-long question-and-answer session with Buffett and Berkshire Vice Chairman Charlie Munger.

It was during that session that Buffett revealed he had very nearly made an acquisition of more than $22 billion recently, which would have been one of his biggest ever.

The 81-year-old Buffett, recently diagnosed with early-stage prostate cancer, spent much of the day assuring shareholders he was in good health.

While Buffett has his acolytes, not everyone was impressed with his performance. Australian hedge fund manager John Hempton, in a post on his blog on Saturday, said the day was full of the usual questions on politics, economics and the like.

I got all this -- and for the most part I got the usual homily answers. (The same questions were asked last year and the year before and the year before that. Answers can be got from meeting notes), Hempton wrote.

During the CNBC interview, Buffett reiterated his support for Wal-Mart Stores Inc, saying a scandal over bribe payments in Mexico did not change his opinion of the stock. He is Wal-Mart's fifth-largest shareholder.