Madison Dearborn Partners, a US-based private equity investment firm, has agreed to acquire a 51% equity stake in TransUnion, a credit-information firm, from its current owners, the Chicago-based Pritzker family.

The Pritzker family business interests will retain approximately 49% ownership of the company.

Penny Pritzker, chairman of TransUnion, said: “Madison Dearborn Partners and the Pritzker family share a long-term view of TransUnion and a belief that our partnership, combined with the strength of TransUnion’s leadership and dedicated team of associates, will be a catalyst for the acceleration of TransUnion’s strategy and growth. We look forward to partnering with the Madison Dearborn Partners team to capitalize on the numerous growth opportunities before us.”

Tim Hurd, a managing director of Madison Dearborn Partners, said: “TransUnion is a remarkable company, with an extensive global reach, diverse service offerings and a strong management team. We look forward to partnering with the Pritzker family business interests and to investing in TransUnion’s future to support its strategy for diversification and growth.”

Closing of the transaction is subject to satisfaction of customary conditions to closing and regulatory approvals.