Consolidation wave

After a several-year hiatus that included the financial crisis and the beginning of a global regulatory revamp, the world's exchange operators are back in the takeover game.

Singapore Exchange bid for Australia's ASX late last year. And last week, London Stock Exchange said it would buy Toronto Stock Exchange operator TMX Group.

Both of those deals have already run into foreign ownership concerns, underlining the role nationalism plays in deals for countries' capital-raising markets.

Regulators are paying close attention to the deals, and some traders have expressed fear that they will limit competition.

Deutsche Bank and JPMorgan Chase & Co advised Deutsche Boerse on the deal; NYSE Euronext's main financial advisers were Perella Weinberg Partners and BNP Paribas.