Shares in the secondary offer from the Chicago Mercantile Exchange (CME) were sold at double the issue price of stock in the US futures and options exchange's flotation just seven months ago.

The rise in CME's share price is indicative of the strong aftermarket performance of US companies that have floated in the last 12 months. An analysis by Renaissance Capital, the independent IPO research firm, at the end of May showed that US IPOs in the previous year had gained an an average of 25% from their issue price.