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OP Bancorp operates its commercial community banking activities through Open Bank its wholly owned banking subsidiary. It provides commercial banking services to small and medium-sized businesses, their owners, and retail customers, with a focus on the Korean-American community. The bank currently operate twelve full service branches: nine branches across Los Angeles and Orange Counties in California, as well as one branch each in Santa Clara, California; Carrollton, Texas; and Las Vegas, Nevada. Additionally, it maintains five loan production offices located in Pleasanton, California; Atlanta, Georgia; Aurora, Colorado; Lynnwood, Washington; and Fairfax, Virginia. Substantially all its business activities are conducted through the Bank.

Berkshire Hathaway is a holding company with a wide array of subsidiaries engaged in diverse activities. The firm's core business segment is insurance, run primarily through Geico, Berkshire Hathaway Reinsurance Group, and Berkshire Hathaway Primary Group. Berkshire has used the excess cash thrown off from its operations to acquire Burlington Northern Santa Fe (railroad), Berkshire Hathaway Energy (utilities and energy distributors), and the companies that make up its manufacturing, service, and retailing operations (which include Precision Castparts, Lubrizol, Clayton Homes, Marmon, and IMC/ISCAR). The conglomerate is unique in that it is run on a completely decentralized basis.