MADRID (MarketWatch) -- European stock markets opened lower on Thursday, on news Moody's Investors Service has threatened to downgrade 114 financial institutions in 16 countries and as fresh worries surfaced over a bailout for Greece. Spanish banks, such as Bankia SA /zigman2/quotes/205465641/delayed ES:BKIA +0.81% down 8.6%, were among the biggest losers in Europe, with the Spain IBEX 35 index /zigman2/quotes/210597995/delayed XX:IBEX +0.04% down 2%. The Stoxx Europe 600 index /zigman2/quotes/210599654/delayed XX:SXXP -0.11% fell 0.7% to 262.20, with several stocks also moving after corporate updates, such as Randstad Holding NV /zigman2/quotes/202421454/delayed NL:RAND +0.91% , off 5%, AXA SA /zigman2/quotes/206172043/delayed FR:FP +3.07% , down 3.2%, and Societe Generale SA /zigman2/quotes/206663756/delayed FR:GLE +2.63% , down 2.3%. Shares of Renault SA /zigman2/quotes/200919924/delayed FR:RNO -0.20% rose 4.4% after results. The German Dax 30 index /zigman2/quotes/210597999/delayed DX:DAX -0.51% fell 1.2% to 6,678.33 and the French CAC 40 index /zigman2/quotes/210597958/delayed FR:PX1 -0.59% fell 0.6% to 3,369.94. The FTSE 100 index /zigman2/quotes/210598409/delayed UK:UKX -0.53% fell 0.7% to 5,849.29.