ACGL vs IBKR Comparison

Arch Capital Group Ltd is a Bermuda company that writes insurance and reinsurance with operations in the United States, Canada, Europe, Australia, and the United Kingdom. The business operates through three underwriting segments: insurance, reinsurance, and mortgage. The insurance segment provides specialty risk solutions to clients across various industries. The reinsurance segment provides reinsurance services which cover property catastrophe, property, liability, marine, aviation and space, trade credit and surety, agriculture, accident, life and health, and political risk. The mortgage business provides risk management and risk financing products to the mortgage insurance sectors through platforms in the U.S., Europe and Bermuda.

Interactive Brokers is a large, automated, retail and institutional brokerage that boasted nearly $570 billion in customer equity at the end of 2024. The company cut its teeth as a market maker, introducing US financial markets to automated and algorithmic training before expanding into brokerage services in 1993. The firm has a wide-ranging client base, with its best-in-class order execution and extremely low margin lending rates catering to a sophisticated audience of hedge funds, proprietary traders, and introducing brokers that account for about 45% of the firm's commissions. With operations spanning more than 160 electronic exchanges, 36 countries, and 28 currencies, Interactive Brokers caters to a global clientele, with more than 80% of active accounts sitting outside the US.