The upgrade comes after Berkshire's deal with Energy Future Holdings Corp to acquire its Oncor Electric Delivery interest was terminated Monday. Sempra Energy (SRE) - Get Report agreed to buy Oncor for $9.45 billion, besting Berkshire's $9 billion offer.
Berkshire remains a "AA" credit rating at S&P. Berkshire's class B stock traded up 0.6% to $179.33 late-morning Tuesday.
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