Colorado private equity firm Mountaingate Capital has bought a majority interest in Chicago-based B2B marketing agency Walker Sands from Stone-Goff Partners. Terms weren’t disclosed.  

The agency said the investment would enable it to invest more in data, analytics, measurement and technology. 

It also plans to make additional acquisitions and expand geographically.  

Mountaingate is known for its investing in marketing firms such as health care-focused W2O Group, Bounteous, Tinuiti and Mars United Commerce, which was acquired by Publicis Group a year ago for 528 million euros (approximately $615 million), according to a company filing. 

According to the agency over the past six years—about the time that Stone-Goff owned its stake--it has: 

The agency has 100+ clients and offices in Seattle and Boston in addition to its Chicago headquarters. Andrew Cross and Dave Parro oversee Walker Sands as Co-CEOs