Stockbroker (noun)

A person or firm that buys and sells shares and other securities on behalf of clients.

Origin:

Mid 19th century: from stock (because stocks were originally bought and sold by brokers) + broker.

Examples:

1. He became a stockbroker after graduating from business school.
2. She works as a stockbroker for a large investment firm.
3. He was able to make a lot of money as a stockbroker.
4. The stockbroker gave her advice on which stocks to buy.
5. He was fired from his job as a stockbroker for insider trading.