The Progressive Corporation, an insurance holding company, provides personal and commercial auto, personal residential and commercial property, general liability, and other specialty property-casualty insurance products and related services in the United States.

Chubb Limited provides insurance and reinsurance products worldwide. The company's North America Commercial P&C Insurance segment offers commercial property, casualty, workers' compensation, package policies, risk management, financial lines, marine, construction, environmental, medical, cyber risk, surety, and excess casualty; and group accident and health insurance to large, middle market, and small commercial businesses.

Cincinnati Financial Corporation, together with its subsidiaries, provides property casualty insurance products in the United States. The company operates through five segments: Commercial Lines Insurance, Personal Lines Insurance, Excess and Surplus Lines Insurance, Life Insurance, and Investments.

W. R. Berkley Corporation, an insurance holding company, operates as a commercial lines writer in the United States and internationally. It operates in two segments, Insurance and Reinsurance & Monoline Excess.

The Allstate Corporation, together with its subsidiaries, provides property and casualty, and other insurance products in the United States and Canada.

Markel Corporation, a diverse financial holding company, markets and underwrites specialty insurance products in the United States, Bermuda, the United Kingdom, rest of Europe, Canada, the Asia Pacific, and the Middle East.

RLI Corp., an insurance holding company, underwrites property and casualty insurance in the United States and internationally. Its Casualty segment provides commercial and personal coverage products; and general liability products, such as coverage for third-party liability of commercial insureds, including manufacturers, contractors, apartments, and mercantile.

CNA Financial Corporation provides commercial property and casualty insurance products primarily in the United States. It operates through Specialty, Commercial, International, Life & Group, and Corporate & Other segments.

White Mountains Insurance Group, Ltd., through its subsidiaries, provides insurance and other financial services in the United States. The company operates through five segments: HG Global/BAM, Ark, NSM, Kudu, and Other Operations.

W.R. Berkley Corp. is an insurance holding company, which engages in the property casualty insurance business. It operates through the following segments: Insurance and Reinsurance & Monoline Excess.