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OptimumBank Holdings Inc serves as a bank holding company for OptimumBank. The Bank provides community banking services to individuals and corporate customers. The services provided by the bank include demand interest-bearing and non-interest-bearing accounts, negotiable order of withdrawal accounts, borrowings, repayment of loans, money market deposit accounts, debit cards, automated teller machines, and other bank related services.

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.