The £30m-turnover firm, whose 300 staff take Dsi CMM's total to 1,100, has brought expertise in multi-channel marketing, "from traditional printing to complex variable-data output" to "email and web".
K2's markets include telecoms, utilities and healthcare, adding to Dsi CMM's existing client base in industries such as financial services, retail, and travel and leisure.
The buy also gives Dsi CMM "a countrywide footprint", adding the Manchester hub to its production centres in London and the south-east, East Anglia and Tyne & Wear.
K2 chairman Kevin Coleman and managing director Kevin Illingworth will remain with the group following the "friendly" takeover.
Dsi CMM chief executive Yolanda Noble said: "Our strategy for growth has firmly concentrated on acquisitions or mergers which bring together organisations with the same attitude to top-notch client service, innovation and client market knowledge; hence the acquisition of K2."
Coleman added: "This is a fantastic opportunity to bring together two like-minded organisations, to the benefit of our combined client-base."
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