RLI Corp., through its subsidiaries, underwrites property and casualty insurance primarily in the United States. Its Casualty segment provides general liability products consisting of coverage for third party liability of commercial insurers, including manufacturers, contractors, apartments, real estate investment trusts, and mercantile; environmental liability for underground storage tanks, contractors, and asbestos and environmental remediation specialists; commercial and personal umbrella liability insurance; and commercial transportation that include automobile liability and physical damage insurance to public transportation risks, equipment dealers, other types of specialty commercial automobile risks, and local, intermediate, and long haul truckers, as well as incidental and related insurance coverage. This segment also offers directors and officers liability insurance, employment practices liability, fiduciary liability, and fidelity coverage; professional liability coverages, such as general liability, property, automobile, excess liability, and worker's compensation coverages , as well as in-home business insurance and medical malpractice coverage. The company's Property segment provides excess and surplus lines and specialty property insurance, such as fire and earthquake; and insurance for office buildings, apartments, condominiums, and certain industrial and mercantile structures. This segment also offers cargo, hull and protection and indemnity, and marine liability, as well as inland marine coverages, including builders' risks, contractors' equipment, and other floater type coverages; crop reinsurance; facultative and other treaty reinsurance; and homeowners and dwelling fire insurance. The company's Surety segment provides surety coverage for license and permit, notary, and court bonds; and contract, commercial, and oil and gas surety coverage. RLI Corp. was founded in 1965 and is headquartered in Peoria, Illinois.