The addition of the two regions to Bite's existing HP relationship in the US puts its global business with the tech giant at an estimated US$4m.
Bite displaces previous incumbent Hill & Knowlton. Earlier this year, HP consolidated its corporate crisis and issues business with Weber Shandwick.
HP director of international external comms Christina Schneider said the decision was the 'next step in our strategy of collaborating with the world's best agencies'. Bite will focus on communicating HP's credentials in terms of inovation and sustainability.
HP has held successive global reviews over the past year, with Edelman and Burson-Marsteller also netting specific accounts.
The account is Bite's first major global retainer, and follows its acquisition of Asia-Pacific agency Upstream Asia last year.