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Paul Kim, Nate Thompson and Russ Whitman of the newly merged Ratio digital agency.

Digital agencies Ratio Interactive and Cypress announced this morning that they’re merging, bringing together two Seattle-based companies that have made a mark on Windows 8 and Xbox 360 in addition to iPad, Android and other platforms.

The combined agency, with more than 120 employees, will be known as Ratio. Former Cypress CEO Nate Thompson will be CEO of the new company, and former Ratio Interactive CEO Paul Kim will be chief operating officer. Former Ratio Interactive chief strategy officer Russ Whitman and chairman John Sercu will retain those roles in the new company.

The companies say the merger will help them provide a broader range of services across platforms. Clients of the combined company include AT&T, Barnes & Noble, Intel, NBC and Conde Nast.

Financial terms of the deal weren’t disclosed. The new Ratio, which calls itself the “largest multi-screen agency in the Northwest,” will remain based in Seattle but also says it will be expanding its footprint in New York and Los Angeles.

Ratio Interactive has its roots in iOS and Android development but has become one of the largest makers of apps for Microsoft’s Windows 8. Cypress makes an application framework for Xbox Live video apps called CypressX that aims to help publishers monetize their content and maintain their apps more easily.

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