Japan’s four leading property and casualty insurers admitted on Thursday to having shared contract information of their auto insurance customers with their competitors, following a recent series of scandals exposing industry-wide compliance issues. The four firms involved are Tokio Marine & Nichido Fire Insurance Co., Sompo Japan Insurance Inc., Mitsui Sumitomo Insurance Co. and Aioi Nissay Dowa Insurance Co. The information that was shared included customer names, insurance policy numbers, types of insurance, maturity dates and premium amounts. The data leak revolved around insurance agencies…