Altamont Capital, a private equity firm, completed the acquisition of a minority stake in Cornerstone Advisors, a provider of advisory services to banking institutions. Financial terms were not disclosed. "We are very excited about this investment and believe that it positions Cornerstone very well for the future. With Altamont's resources, we are better suited to capitalize on attractive growth opportunities while continuing to provide our clients with the superior solutions and customer experience that they have come to expect," Scott Sommer, Cornerstone CEO.