Behavioral healthcare provider Acadia Healthcare (NASDAQ: ACHC), a company backed by Bain Capital and Waud Capital, has agreed to acquire Priory Group. The purchase agreement involves almost 5.4 million shares of Acadia common stock and a cash consideration of approximately £1.28 billion, including about £925 million to repay Priory’s outstanding debt. Acadia expects the transaction to be completed February 16. Priory, a provider of behavioral healthcare services in the U.K., is expected to produce around $865 million in revenue and adjusted EBITDA of approximately $196 million for 2015. Advent International had acquired the company in 2011.