I just thoroughly reviewed the trading hours of the Madrid Stock Exchange because most people are not clear about when they can actually trade. The thing is, the exchange opens at 9:00 am local time, but there is an auction period starting at 8:30 am where you can already place orders. Then it closes at 5:30 pm, although there is another closing auction until 5:35 pm. The important thing to know is that the Madrid Stock Exchange only operates from Monday to Friday, so forget about weekends. Some people don't realize that behind all this is the SIBE, which coordinates the four Spanish exchanges. The IBEX 35 is the most important because it groups the 35 companies with the highest market capitalization. If you trade in Madrid, you need to be clear about the closing time because after that, you can't do anything until the next day. It also depends on where you are in Latin America, because if you're in Argentina or Uruguay, the exchange opens at 4:00 am your time. In Mexico, it's even earlier, at 1:00 am. Basically, if you want to trade major Spanish stocks like BBVA or Santander, you need to pay attention to these hours. Holidays also matter a lot, so check the calendar before assuming the market will be open.