A sub-broker is an agent who is associated with a trading member of the stock exchange. To be a sub-broker, one must be registered with the Securities and Exchange Board of India (SEBI) and with a local stock exchange. Sub-brokers help their clients to buy and sell securities in the stock market. They offer information to them on various securities. They also pass on the clients’ trading orders to the trading member or brokerage firm with which they are associated. For the service provided, they earn a percentage of the brokerage commission.