Small companies are the most common type of companies in Spain (2018).

The graph above shows statistics over the amount of enterprises in Spain in 2018, by number of employees.

The most common type of enterprises were "small companies" with no employees (appr. 1.8 million companies). Only 118 Spanish companies had over 5000 employees. 

Graph and information from: https://www.statista.com/statistics/502368/number-of-enterprises-in-spain-by-number-of-employees/