Siebert Financial Corp., together with its subsidiaries, engages in the provision of brokerage and financial advisory services in the United States. It offers self-directed trading, market making and fixed income investment, stock borrow/stock loan, equity compensation plans, and wealth management/financial advisory; Investment banking / capital markets; and advanced trading services; corporate services; independent retail execution services; and retail customer services. The company also offers self-directed retirement accounts, as well as lends customers a portion of the market value of marginable securities held in the customer's account. In addition, the company provides data technology platform that offers various services, such as email and messaging, market data systems and third-pa…