1. First, you must go to a licensed brokerage house, which has several branch offices in main cities of the country, and sign an intermediation contract (A contract signed by an investor and a brokerage house, through which the former authorizes the latter to buy and sell stocks in his/her name). This link will show you the licensed brokerage houses:  www.bmv.com.mx/BMV/JSP/sec1_casasbolsa.jsp

2. You must channel your purchase or sale orders regarding shares of stock through a stockbroker. These agents are licensed specialists who have been trained and authorized by the National Banking and Securities Commission.

3. Once the transaction has been perfected or closed, the Stock Exchange informs all the participants in the market about the characteristics of the transaction through the electronic media and the printed materials for said purpose.