Rackspace Hosting Inc. bought RelationEdge LLC, a Salesforce Platinum Consulting Partner and digital agency, for an undisclosed sum.

The acquisition allows Rackspace to expand its capabilities through the continuous transition to modern technologies such as software-as-a-service applications, according to a May 17 statement.

Texas-based Rackspace plans to operate RelationEdge with "considerable independence," retaining the current leadership and RelationEdge brand.

Founded in 2013, RelationEdge has opened offices in a dozen cities throughout the U.S. and currently has 125 employees.

Both companies are privately held, with Rackspace owned by subsidiaries of certain funds of Apollo Global Management LLC and co-investors. RelationEdge was owned by its founders, its regional market leaders and Tide Rock Ventures.