The Bureau of Securities within the Department of Banking and Finance regulates the sale of securities. There are no stock exchanges in the state. Securities are sold in Nebraska by 336 broker-dealers through 2,141 employees; 56 investment advisory firms also are registered. The state houses 20 NASDAQ companies, one NASDAQ market maker, and incorporated nine NYSE-listed companies. The five with the most revenues are: ConAgra, Berkshire Hathaway, Union Pacific, Inacom, and the Commercial Federal Corp.