Adtech will now serve all online advertising for Global's nine branded websites, which also owns Classic FM and Galaxy.
Global is the biggest commercial radio company in the UK and the contract is a big win for Adtech.
Kit Desai, country manager for Adtech UK & Ireland, said: "Global Radio have an incredible market reach and this is a fantastic opportunity for us to help them have an even better relationship with their audience and to make their advertising business a big success."
Paul Sigaloff, sales director at Global Interactive, said: "As a commercial radio business, online advertising is very important to us and we need to provide listeners with relevant and interactive campaigns to get the desired outcome for advertisers.
"At the same time we need to be able to measure success and provide a good level of reporting -- the solution from Adtech enables us to do exactly that."
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