Private equity continues to invest in rehabilitation companies. The latest deal, the fifth of five announced in March 2016, is from Advent International, a Boston-based firm with more than $30 billion invested in 310 companies. For an undisclosed price, the firm took a majority interest in ATI Physical Therapy, a portfolio company of KRG Capital. ATI specializes in outpatient rehabilitation and adjacent healthcare services. It operates more than 500 clinics in 19 states, and served nearly 300,000 unique patients in 2015.