CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed Berkshire Hathaway Inc.'s (NYSE:BRK) Issuer Default Rating at 'AA-' and senior unsecured debt at 'A+'. The Rating Outlook is Stable. A complete list of ratings and rating actions follows at the end of this release. KEY RATING DRIVERS Fitch's rating action follows Berkshire Hathaway's announcement of a definitive agreement to acquire Precision Castparts Corp. (PCP) for $235 per share. The transaction is valued at approximately $37.2 billion, i


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