RLI is an insurance holding company. Through its subsidiaries collectively known as RLI Insurance Group, Co. is engaged in underwriting selected property and casualty insurance. Co. has three segments: casualty, which includes commercial excess and personal umbrella, general liability, commercial transportation, professional services, small commercial, executive products, and other casualty; property, which includes commercial property, specialty personal and other property coverages; and surety, which includes miscellaneous surety coverage, commercial surety bonds, and bonds for small to medium-sized contractors.