Interest in physician medical groups is reaching a boiling point in 2015, with 36 transactions announced as of May 22. Nine announcements were made in May alone, including last week’s deal for the 276-physician Chidren’s and Women’s Physicians of Westchester, by Boston Children’s Hospital. Contrast that with 2014’s total of 60 acquisitions, and 2015 is shaping up to be an interesting year. The big players—IPC Healthcare (NASDAQ: IPCM), MEDNAX (NYSE: MD) and TeamHealth Holdings (NYSE: TMH)—are still leading the field in the number of acquisitions, but there several other companies making inroads. Check out the chart below.