By Sara Sjolin
LONDON (MarketWatch) -- European stock markets trimmed gains in afternoon trade on Monday, as banks headed into red territory. The Stoxx Europe 600 index XX:SXXP -0.09% was marginally higher at 242.57, after trading as high as 244.58 earlier in the session. Spain's IBEX 35 index XX:IBEX -2.29% trailed other European indexes and sank 2% to 6,414.20, as shares of Bankia SA plunged 13.9%. The German DAX 30 index DX:DAX -0.24% was slightly lower at 6,338.71, while France's CAC 40 index FR:PX1 -0.15% gained 0.2% to 3,052.35. The U.K.'s FTSE 100 index was up 0.2% at 5,362.14.