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Billionaire Buying Spree

By CNBC.com Staff

Three big investors -- all famous for their dealmaking skills and investing instincts --disclosed details this week about major holdings in their portfolios.

Berkshire Hathaway Chairman Warren Buffett, hedge fund boss and activist investor Carl Icahn and  Sears Holdings chairman Edward Lampert, who orchestrated Kmart's emergence from bankruptcy in 2003 before its merger with Sears, disclosed the details in regulatory filings.

Buffett Names Railroad, Healthcare Firms

Buffett revealed the names of two railroad stocks recently purchased by his holding company Berkshire Hathaway, saying in a filing that it owns 10.5 million shares of Union Pacific and 6.4 million shares of Norfolk Southern.

Berkshire revealed an 11% stake in Burlington Northern Santa Fe in April, which made Berkshire the transportation company's largest shareholder.

The legendary investor told CNBC's Liz Claman last month that Berkshire bought large stakes in two North American railroad companies but declined to give names. In another recent interview with Claman, however, he did discuss his reasons for investing in railroads.

In a separate SEC filing, Berkshire said it increased stakes in two major health care companies, Johnson & Johnson and Sanofi-Aventis .

Ichan Buys Energy, Shaves Time Warner Stake

Investor Carl Icahn has purchased a big stake in Anadarko Petroleum , suggesting the billionaire investor is betting on further consolidation in the oil services sector.

Icahn Management, one of Icahn's investment vehicles, took a stake of about 3.1 million shares in Anadarko, worth about $133.5 million as of March 31, the filing said Tuesday.

Anadarko last year purchased another of Icahn's targets, Kerr-McGee, after an activist campaign by Icahn and hedge fund Jana Partners.

The veteran New York financier also disclosed that he holds 4.6 million shares in oilfield services company Pride International of March 31.

Icahn also cut his stake in media group Time Warner after a year-long proxy battle that ended last year, according to regulatory filings. Icahn cut his Time Warner stake to about 12.9 million shares in two investment vehicles as of March 31 from about 25 million shares in the quarter ended Dec. 31, the filing said.

Lampert Loading Up On Citigroup

RBS Partners, an affiliate of Edward Lampert's ESL Investments, disclosed that it owned 15.24 million shares of Citigroup worth $782.6 million as of March 31 this year.

According to a regulatory filing, Lampert has been slowly accumulating shares of Citigroup over the past year. He had around 10 million shares at the end of 2006, and by the end of March, his stake grew to 15 million shares.

A spokesman for Lampert declined to comment, but one thing is certain: Lampert is a value investor, which means he thinks that shares of Citigroup are worth more than they are currently trading.