LCH.Clearnet, the European clearing company, has raised concerns with the European Commission about the potential for monopolistic practises resulting from the purchase by Deutsche Boerse of a controlling stake in STOXX, the stock index provider, according to people familiar with the matter.

LCH.Clearnet is concerned that Deutsche Boerse - the German exchange company that has a majority stake in Eurex, the trading platform, and its subsidiary Eurex Clearing - could make it difficult for LCH.Clearnet to get a license to clear derivatives trades in instruments based on EURO Stoxx indexes in order to leave its own clearing unit with a monopoly, according to the letter from LCH.Clearnet, obtained by Dow Jones Newswires.