JAA pitched against two undisclosed agencies to win the account.
IG has been handling its media planning and buying in-house since January, after working with Mediacom until the end of 2012.
JAA’s first project will be to help launch a large, multi-channel campaign this months, to emphasise IG’s position as a leading foreign exchange trading provider.
The company was rated as the UK’s largest retail foreign exchange (FX) provider according to the Investment Trends UK Leveraged Trading Report November 2012.
The campaign will run in outdoor media and national and specialist financial press. All online elements of the activity will continue to be run in-house.
Ali Hine, marketing director at IG, said: "This represents a very positive step forward in our approach to media planning and buying in the UK. JAA really listened to our business challenges and responded with a first-class pitch."