Some of the investment world's biggest names are betting one of the top-performing Middle Tennessee stocks of 2012 has more room to run.

In the last three months of 2012, T. Rowe Price, JPMorgan Chase and AllianceBernstein all bought enough shares of Acadia Healthcare to amass stakes of at least 5 percent. Their purchases came as Chicago private-equity firm Waud Capital lightened its holdings in the Franklin-based provider of behavioral health services via a secondary offering. Waud now owns about 29 percent of Acadia, down from 43 percent last fall.

Barring new filings from other investment firms, T. Rowe Price now appears to be Acadia's No. 2 investor. The Baltimore-based firm recently said it owned almost 3.2 million shares of Acadia on Dec. 31. That was more than double the number it reported for the third quarter and amounts to about 6.5 percent of Acadia, which rose more than 130 percent last year.

Right behind T. Rowe Price are JPMorgan Chase and AllianceBernstein. The firms earlier this month said they owned about 2.7 million and 2.6 million shares, respectively, each stake being about 5.1 percent of Acadia's outstanding stock.

Acadia's stock (Ticker: ACHC) has followed up its blockbuster 2012 with more gains so far this year. Since Dec. 31, it has risen another 15 percent and is up 4 percent today to about $26.80.