Founded in 1965, RLI Corporation (RLI) is a specialty property-casualty (P&C) underwriter that caters primarily to niche markets through its main operating subsidiary, RLI Insurance Company. Other subsidiaries include Mt. Hawley Insurance Company, Underwriters Indemnity Company, and Planet Indemnity Company. The company classifies its operations into four segments Casualty, Property, Surety, and Marine. General liability business and commercial and personal umbrella liability coverage are offered through the Casualty segment (which contributed 63.4% of the 2006 gross written premium of $799.0 million). The Property segment (which contributed 28.2% of the 2006 gross written premium) provides commercial property coverage, including excess and surplus (E&S) lines and specialty insurance. The Surety segment (which contributed 8.4% of the 2006 gross written premium) offers contract and commercial surety insurance. RLI recently added the fourth business unit RLI Marine, which will be dealing with cargo, hull, protection, and indemnity, primary and excess liabilities, yachts, and other marine coverage. RLI mostly covers markets in California, New York, Florida, and Texas. Premiums, investment income, and net realized investment gains accounted for 83.8%, 11.3%, and 4.9%, respectively of the $632.7 million in 2006 revenue. RLI carried a financial strength rating of A+ (Superior) from A.M. Best Company.