RLI Corp. operates as a holding company, which engages in the provision of insurance and underwriting services. It operates through the following segments: Casualty, Property and Surety. The Casualty segment offers healthcare and transportation insurance. The Property segment consists of commercial fire, earthquake, difference in conditions, marine, facultative and treaty reinsurance, including crop and select personal lines policies, including pet insurance and homeowners reinsurance services. The Surety segment engages in writing contract surety coverage, licenses and bonds for commercial, energy and industrial sectors. The company was founded by Gerald D. Stephens in 1965 and is headquartered in Peoria, IL.