(Reuters) - Warren Buffett's Berkshire Hathaway Inc on Friday said it has increased its holdings in some of its biggest stock investments, including Wells Fargo & Co and International Business Machines Corp .
The changes were disclosed in a regulatory filing detailing Berkshire's U.S.-listed stock portfolio as of March 31.
Berkshire previously disclosed it had bought $1.62 billion of equity securities and sold $1.11 billion in the quarter.
(Reporting by Jonathan Stempel in New York; Editing by Meredith Mazzilli)
