NEW YORK (Reuters) – Fitch Ratings said yesterday it may cut its ratings on Warren Buffett's Berkshire Hathaway Inc on concerns about the effect its planned acquisition of Burlington Northern Santa Fe Corp will have on its asset profile and capitalisation.

Fitch said it may cut Berkshire from AA-plus, the second-highest investment grade.

The move comes a day after Standard & Poor's said it may cut Berkshire from its top AAA rating. Berkshire said on Tuesday it agreed to pay $26 billion in cash and stock to buy Burlington in a bet the railroad operator will benefit from a recovering US economy.