You may be wondering why the FTSE 100 is called the FTSE 100 and what exactly does it stand for. In fact, the name FTSE 100 comes from the fact that the index is owned equally by the Financial Times and the London Stock Exchange, also known as the LSE. This gives the association of France Télécom and SE, including FTSE. The number 100 corresponds here to the number of companies making up the index.