On Friday afternoon, after the news broke of Catalonia's declaration of independence, the value of the Ibex 35 index of Spain's biggest companies dropped by 1.45% in comparison with the beginning of the day's trading.
Spanish banks were the biggest losers. The Catalonia-based Banco de Sabadell was down 4.85% and CaixaBank was down 2.74%. The Banco Bilbao Vizcaya Argentaria was down 3.31%, according to data from Marketwatch.
The euro currency also decreased in value after the Catalan vote, trading down 0.6% at $1.16 to the dollar on Friday afternoon.
After a turbulent week, the STOXX 600 index of European stocks was down 0.37% in comparison with the previous day's trading, although large European markets such as the German DAX and the London Stock Exchang were up in comparison with Thursday.