Spain's benchmark stock market index Ibex-35 fell 0.09 percent on Thursday to close at 10,294.8 points after four sessions of rises.
The day was marked by the economic slowdown in the eurozone and new data about Spain's public debt that reached 1.007 trillion euros (1.345 trillion U.S. dollars) in June.
FCC shares led falls losing 1.85 percent followed by Bankinter, Sacyr and Banco Popular that lost 1.79 percent, 1.67 percent and 1.30 percent respectively. Spain's second-largest bank BBVA and the eurozone's largest bank Santander lost 0.51 percent and 0.25 percent respectively.
Tecnicas Reunidas shares led rises climbing 1.49 percent. It was followed by Gamesa, Red Electrica and Enagas that rose 1.30 percent, 1.25 percent and 1.17 percent respectively.
Spanish risk premium stood at 146.60 points, while Spain's 10-year bond interest rate stood at 2.487 percent.