Arch Capital Group Ltd., together with its subsidiaries, provides insurance, reinsurance, and mortgage insurance products worldwide.

The company's Insurance segment offers primary and excess casualty coverages; loss sensitive primary casualty insurance programs; collateral protection, debt cancellation, and service contract reimbursement products; directors' and officers' liability, errors and omissions liability, employment practices and fiduciary liability, crime, professional indemnity, and other financial related coverages; medical professional and general liability insurance coverages; and workers' compensation and umbrella liability, as well as commercial automobile and inland marine products.

It also provides property, energy, marine, and aviation insurance; travel insurance; accident, disability, and medical plan insurance coverages; captive insurance programs; and contract and commercial surety coverages.

This segment markets its products through a group of licensed independent retail and wholesale brokers.

Its Reinsurance segment provides reinsurance for third party liability and workers' compensation exposures; marine and aviation reinsurance; surety, accident and health, workers' compensation catastrophe, agriculture, trade credit, and political risk products; reinsurance protection for catastrophic losses, and personal lines and commercial property exposures; life reinsurance; casualty clash; and risk management solutions.

This segment markets its reinsurance products through brokers.

The company's Mortgage segment offers private mortgage insurance covering one-to-four family residential mortgages; mortgage insurance to cover previously originated residential loans; quota share reinsurance; and credit risk-sharing products.

This segment sells its products through direct basis and through brokers to mortgage originators.

The company was founded in 1995 and is based in Pembroke, Bermuda.