The stock market has long been known to the public, the stock market also has a very broad meaning. in short the stock market is a market for a variety of long-term financial instruments that can be traded in the form of debt securities, equity, mutual funds, derivative instruments and others. The capital market can be used as a means of funding for a company or other intuition and as a means of investing in society. one of the products on the indonesia stock exchange is stock. Therefore, in this paper we will discuss about the procedures and systems for proper stock transactions on the Indonesian stock exchange precisely on the primary and secondary markets, and after being able to transact, what protection is given to investors. This is very necessary because it sees social situations that are constantly changing and developing and basically a person makes transactions without seeing and learning what will happen next and without anticipating it. so it is necessary to have knowledge about transacting on the stock market especially in stock transactions so that when the person makes a transaction will get full legal protection. so that in the future no party will be harmed, and with a healthy stock exchange system, it will grow the quality of the Indonesian economy. and when people trade stocks, the system is healthy and safe.