what do you call a person who trades stocks
Stock trader A stock trader or equity trader or share trader is a person or company involved in trading equity securities. Stock traders may be an agent, hedger, arbitrageur, speculator, stockbroker.
Sole proprietorship A sole proprietorship, also known as the sole trader or simply a proprietorship, is a type of enterprise that is owned and run by one natural person and in which there is no legal distinction between the owner and the business entity. The owner is in direct control of all elements and is legally accountable for the finances of such business and this may include debts, loans, loss, etc.