German stock market operator Deutsche Boerse on Wedneday reported a doubling of its third quarter profit to 315 million euros ($433 million). Revenue rose by 20 percent to 605 million euros. The figures included 25 million euros costs for preparation for its merger with NYSE Euronext, plus a 94 million euro gain from fluctuations in the value of derivatives exchange Eurex which Deutsche Boerse is to take over at the beginning of next year.