Spain leads European stock markets lower By: MarketWatch December 15, 2010 at 04:09 AM EST Spanish stocks lead European markets lower Wednesday as Moody’s Investors Service warns it may downgrade the country’s credit rating. Read More >> Related Stocks: Banco Bilbao Viscaya Argentaria S.A. ADR Banco Santander ADR Barclays Plc ADR Deutsche Bank Ag Novartis Ag ADR Simon Property Group