The agreement - which sees Effective Event Solutions become a preferred supplier for global electronics and technology company Siemens AG - is in place until the end of May 2013.
The contract will be renewed on a 12-month rolling basis and will include sales conferences, supplier meetings, trade fairs, incentives, workshops and product presentations.
Account director Helen King said: "We look forward to working with them on all their events, now and in the future. Being a preferred supplier makes it easier for anyone within the Siemens group to be able to access our information and contact us direct - we can't wait to work with more people in the business and build on our strong relationship with the organisation."
Meanwhile, the Oxford-based agency has been re-appointed by technology distributor Steljes to run incentive programmes in 2012 and 2013 following an inaugural event in February.
This year's incentive - the first that Steljes has held - involved a trip to Dubai for 22 delegates.
Steljes, which distributes products from companies including Hitachi, Epson and Panasonic, is holding the incentives as a way of motivating teams to hit targets. Destinations for the next two trips are yet to be decided.