Euronext, an alliance of the Paris, Amsterdam and Brussels stock exchanges, plans to move its derivatives business to London and migrate it onto Liffe's Connect platform.
This could help generate between £10m and £15m a year in pre-tax technology cost savings by 2005, said Euronext. However, there will be a one-off integration cost of £20m.
Euronext's £555m offer for Liffe was accepted earlier this week, trumping a higher offer by the London Stock Exchange.
However, there has been speculation that there will be further consolidation among the stock exchanges, including the London Stock Exchange.