MDC Partners is taking a majority stake in Redwood City, Calif.-based Y Media Labs.

The shop, which focuses on mobile strategy and design capabilities, was founded by CEO Ashish Toshniwal and Chief Technology Officer Sumit Mehra in 2009. It has since grown to 140 people across Redwood City, Indianapolis and Bangalore, India.

"In today's environment, mobility is at the very core of how brands need to approach their business and how they go to market," said Miles Nadal, chairman and CEO of MDC Partners, in a statement. "Our best-in-class agency partners have long proven that the combination of creativity and technology is a powerful force for disruptive innovation, and they have been at the entrepreneurial forefront of digital innovation. Now, with Y Media Labs as a partner, our network can even more powerfully help clients connect deeply with consumers, inventing and building to create new revenue streams and increase marketing ROI."

Among Y Media's clients are American Express, Apple, eBay, EMC, First Data, L'Oréal, Staples and Western Union.

The move follows a string of agency investments for MDC in 2014, including Hunter PR, Albion, Kingsdale and Luntz Global.

The agency holding company's portfolio also includes 72andSunny, CP&B, Assembly, Redscout, Laird & Partners, Vitro and Colle & McVoy.