In this issue of JAMA Internal Medicine, Bruch and colleagues1 inform us that during the past decade, private equity firms have acquired or invested in large numbers of obstetrician-gynecologist medical groups. Most of these acquisitions and investments occurred during the past 3 years. Given the difficulty of identifying such acquisitions and investments, it is likely that their true number is even larger than Bruch and colleagues report, despite the labor-intensive methods the authors employed to identify them.