John Thain has big plans for the Big Board. The chief executive of the NYSE Group told Financial Times that if acquiring Euronext doesn’t yield the exchange a hoped-for share of international listings, it will either consider buying the London Stock Exchange, or start a new exchange to compete against the LSE. That would make things mighty interesting, as the NYSE’s nemesis, the Nasdaq, has already taken a 25.1% share of the London exchange. Thain explained that it is possible foreigners would shun Euronext for the exchange in London, which has become a center for international finance. Separately, Thain suggested he may be looking to expand into Asia.