Warren Buffett, the billionaire chairman of Berkshire Hathaway Inc., said he's pursuing more opportunities in Asia after boosting reinsurance sales and expanding the Iscar Metalworking Co. unit on the continent.

"Korea, Japan and you name it," Buffett, 81, said Saturday at Omaha, Nebraska-based Berkshire's annual meeting.

Buffett visited South Korea, Japan and India last year, and China in 2010. Berkshire owned almost 4 million shares in South Korean steelmaker Posco and a stake in Chinese carmaker BYD Co. as of Dec. 31, according to regulatory filings. Japan, rebounding from the March 2011 earthquake and tsunami, and Thailand, which suffered record floods last year, are among countries where Berkshire has increased sales.