Berkshire’s Negative S&P Watch Hits Almost 1,000 Muni Bonds

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Municipal bonds from California to Puerto Rico may lose their second-best credit rating from Standard & Poor’s after the company put Berkshire Hathaway Inc. and its core insurance units on a negative watch.

Berkshire Hathaway Assurance Corp. had the outlook on its AA+ rating cutBloomberg Terminal Tuesday, and S&P began dropping its view of the 966 muni securities the insurer backs on Wednesday, according to data compiled by Bloomberg. Berkshire Chairman Warren Buffett got into the muni-bond insurance business in 2008, after the subprime mortgage market began to implode.