The Primera Categoría Serie B, shortened to Serie B or Primera B, is a professional football league in Ecuador. It is in the second tier of the Ecuadorian football league system. Currently contested by ten clubs, it operates a system of promotion and relegation with the top-flight Serie A and the bottom-level Segunda Categoría. The season runs from February to December in two stages. For sponsorship reasons, it is known as the LigaPro Banco Pichincha Pymes.