San Francisco -- Merkle, a Maryland-based provider of customer relationship marketing services, said on Tuesday it has acquired San Francisco-based 5th Finger, a developer of mobile technology for retailers and healthcare organizations. Financial terms of the deal were not disclosed. Merkle said the acquisition will expand its capabilities in the mobile arena. "5th Finger’s unique hybrid of being a traditional mobile agency and deep technology platform provider will help expand Merkle's capabilities to meet the changing landscape of marketing fueled by the evolution of the mobile space," said David Williams, the chairman and CEO of Merkle. 5th Finger, whose retails clients include Jos. A. Bank, Jo-Ann Fabric & Crafts and Safeway, will continue to operate as a brand within Merkle's Digital Solutions Group.