11. Is there a ban on donations from corporations with partial government ownership to political parties?

Source: Article 67(A), Political Parties Act 2013.

Artículo 67.- Los partidos políticos no pueden recibir contribuciones de: 
a. Cualquier entidad de derecho público o empresa de propiedad del Estado o con participación de éste;  
                                                                                                                                                                                
Article 67.- Political parties may not receive contributions from: 
a. Any public law entity or company owned by the State or in which the State has a stake;

Ley de Partidos: https://www.asamblea.gob.sv/sites/default/files/documents/decretos/2E597B83-D1C9-4C91-A9C9-6EC8A44FBA0F.pdf  

Public law entities or companies wholly owned by the state or in which the state has a stake may not contribute to parties.