The 10 Fastest-Growing Mobile Marketing Agencies in the U.S.

Mobile is one area where marketers and brands are increasing their spending.

And the numbers back this up. In January 2014, mobile internet use rose above desktop use. And in 2015, mobile advertising spending is expected to match digital advertising.

It's a mobile-first world, but brands are still struggling to catch up. Agencies are capitalizing on these mobile opportunities and are recreating the way brands interact with consumers and prospects through their personal devices.

We’ve pulled together the fastest-growing mobile marketing agencies based revenue growth from 2012 to 2013 (as gathered in Advertising Age’s Agency Report 2014) in the U.S.

Check out these mobile-savvy firms:

Rockfish

Location: Rogers, Arkansas

Founded: 2006

Rockfish is a digital marketing agency with eight offices across the U.S. It created a mobile app for Walmart to help suppliers track products, and it developed an iPad app for Travel Channel that allowed users to view Anthony Bourdain's favorite sites and restaurants so they could plan their own trip.

Rapp

Location: New York, New York

Founded: 1965

Rapp is a customer experience agency that focuses on using data and technology to drive campaigns. It created a site for Barclaycard where men could upload their photos and find their Premiership player "twin" using facial recognition software. The agency also works with HP, Best Western, and Air France.

HelloWorld

Location: Pleasant Ridge, Michigan

Founded: 1999

Formerly known as ePrize, HelloWorld focuses on creating promotions, loyalty, and CRM campaigns for brands. The agency created a Hunger Games District Look site where people took a quiz to find their unique Capitol of Panem style. The site tied in CoverGirl products people could purchase to create their look. The agency has also worked with Coca-Cola, 3M, and Whole Foods Market.

R/GA

Location: New York, New York

Founded: 1977

R/GA is an international advertising agency that is known for its product innovation and use of technology in marketing. The agency works with Beat by Dre, HBO, and Nike.

Razorfish

Location: New York, New York

Founded: 1995

Razorfish is an international digital agency. It worked with Audi to create a virtual showroom and created My Special K, a lifestyle site for people wanting to improve their eating habits.

GMR Marketing

Location: New Berlin, Wisconsin

Founded: 1979

GMR is an engagement marketing agency that specializes in promotion and events marketing. It boasts a client list that includes the NFL, Xbox, Lowe's, and P&G.

AKQA

Location: San Francisco, California

Founded: 1995

AKQA is a global digital agency that has worked with the World Wildlife Fund, Nike, and Nissan. It recently launched Dyson Link, an app that syncs with the Dyson 360 Eye robot and allows users to start, stop, and program cleaning from their mobile devices.

DigitasLBi

Location: Boston, Massachusetts

Founded: 2006

Digitas LBi is a global agency. It digitized Anne Frank's Amsterdam home to allow anyone to relive her story, and it created the Sprint Cinema app, where movie-goers are sent to the "dream world" of their phone after they leave a movie.

Huge

Location: Brooklyn, New York

Founded: 1999

Huge creates digital products and services and provides integrated marketing services. It recently redesigned NYC.gov and is the agency responsible for building out the HBO GO experience online and through a suite of apps for different platforms and products.

Acquity Group

Location: Chicago, Illinois

Founded: 2001

Acquity Group specializes in customer acquisition campaigns for both B2C and B2B brands. It has worked with HTC, GM, and Adobe.