National Holdings Corp. engages in the provision of investment banking services. It operates through the following segments: Brokerage and Advisory Services and Tax and Accounting Services. The Brokerage and Advisory Services segment includes broker-dealer and investment advisory services, sale of insurance products and licensed mortgage brokerage services. The Tax and Accounting Services segment includes tax preparation and accounting services provided by National Tax. The company was founded in 1947 and is headquartered in New York, NY.