What is a firm that specializes in buying and selling stocks for individual investors called?

Answer: Brokerage firm

Explanation:

A brokerage firm refers to financial institution that deal with the buying and selling of stocks and securities to individual investors. A brokerage firm acts as an intermediary between the buyers and sellers in order to facilitate transaction. They charge a transaction fee which can be in form of a flat fee or a percent of the amount of the transaction.