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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 Insurance segment underwrites commercial insurance business, including premises operations, commercial automobile, property, products liability, and general and professional liability lines.

It also provides workers' compensation insurance products; accident and health insurance and reinsurance products; insurance for commercial risks; specialty environmental products for contractors, consultants, and property owners and facilities operators; specialized insurance coverages for fine arts and jewelry exposures; umbrella and excess liability coverage products; and liquor liability and inland marine coverage for small to medium-sized insureds.

In addition, this segment offers directors and officers, and surety risk products, as well as products for technology, and life sciences and travel industries; cyber risk solutions; casualty, group life, and crime and fidelity related insurance products; personal lines insurance solutions, including home, condo/co-op, auto, and collectibles; automobile, law enforcement, public officials and educator's legal, and employment practices liability, as well as incidental medical insurance products; and at-risk and alternative risk insurance program management services.

The Reinsurance & Monoline Excess segment provides other insurance companies and self-insureds with assistance in managing their net risk through reinsurance on a portfolio basis through treaty reinsurance or on an individual basis through facultative reinsurance.

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Berkley Corporation was founded in 1967 and is based in Greenwich, Connecticut.