Connecticut Attorney General Richard Blumenthal is investigating a possible conflict of interest created by Berkshire's 19.5% stake in ratings agency Moody's, considering the importance of any ratings provided to Hathaway Assurance by Moody's. The probe is part of a general investigation into conflicts of interest in the credit ratings industry.

Buffett’s offer to back Municipal Bonds sent the stock market soaring on hopes that there would be help on potential claim increases. Buffett’s reinsurance offer does not cover any of the subprime mortgage debt and subprime is still likely to have a major effect for the bond insurers.