Jan 9 (Reuters) - The Spanish Ibex-35 stock index closed slightly lower on Monday after five sessions in positive territory, amid market concerns about the anti-democratic riots in Brazil's capital on Sunday.

Among the Spanish companies with most weight in the South American country are Santander, Telefónica, Mapfre and ACS.

The Ibex-35 closed against the trend of European indices, which traded in positive territory amid the reopening of borders in China and lower expectations of further rate hikes by the US Federal Reserve.

In the eurozone, investor confidence rebounded in January for the third consecutive month and the unemployment rate remained at a historic low in November.

Spain's selective Ibex-35 stock market closed down 6.20 points on Monday, or 0.07%, to 8,694.90 points, while the FTSE Eurofirst 300 index of large European stocks rose by 0.93%.

In the banking sector, Santander lost 0.89%, BBVA gained 1.08%, Caixabank gave up 1.34%, Sabadell fell 0.29%, and Bankinter dropped 0.71%.

Among the large non-financial stocks, Telefónica fell 0.06%, Inditex advanced 0.34%, Iberdrola dropped 0.60%, Cellnex gained 0.71%, and the oil company Repsol lost 2.34%.

Among the rest of the electricity companies, Naturgy rose 0.36%, while Endesa gave up 1.73%.

(Information by Benjamín Mejías Valencia; edited by Manuel Farías)