Blackstone group, a investment firm, to acquire minority stake in GTCR, a private equity firm focused on investing in growth companies in the Financial Services & Technology, Healthcare, Technology, Media & Telecommunications and Growth Business Services industries. Financial terms were not disclosed. “GTCR has developed one of the most respected investment franchises in the private equity industry. The firm has a world-class group of leaders and investment professionals, a differentiated investment approach and a long history of success. I have been personally gratified to develop rapport with the GTCR team, and we look forward to our long-term partnership” Mustafa M. Siddiqui, Blackstone Group Managing Director.