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The “A++” rating of the National Indemnity Insurance Group, a wholly owned subsidiary of Berkshire Hathaway Inc., was affirmed by A.M. Best. The group writes “super cat” coverage, which includes a $1-billion layer for the California Earthquake Authority. The rating action applies to National Indemnity Co. and eight affiliated companies: National Indemnity Co. of the South; National Indemnity Co. of Mid-America; National Fire & Marine Ins. Co.; Columbia Ins. Co.; Wesco-Financial Ins. Co.; National Liability & Fire Ins. Co.; Berkshire Hathaway Life Ins. Co. of Nebraska; and BHG Life Ins. Co.