WPP has acquired a minority stake in Austin-based Mutual Mobile, a mobile product development company that generated revenues of more than $25M last year.

The company counts Google, Oracle, Citigroup, Samsung, Del Monte, Xerox and Pearson among clients.

WPP Digital chief Mark Reed sees Mutual as a key addition as more people access the Internet via mobile devices.

He says WPP’s clients need specialist mobile skills to complement their existing digital activities.

Mutual has 320 mobile specialists in Texas and Hyderabad, India.

WPP’s digital revenues topped $5B in 2012, which represented 33 percent of total revenues of $16.5B revenues.

CEO Martin Sorrell wants digital and new media to account for 40-45 percent of overall revenues in five years.

WPP Digital units include Rockfish, Blue State Digital, POSSIBLE, Acceleration, Salmon and Hogarth.