John Rex  J.P. Morgan The buy side says: “His understanding of the sector is unrivaled.”

J.P. Morgan’s John Rex extends his winning streak to eight years; he is also ranked third in Health Care Facilities. “He’s the best in the business — no one else comes close,” proclaims one pension fund manager. Rex, 49, emphasized his buy on Indianapolis-­based benefits provider WellPoint in October 2010, at $56.44, telling clients that the Patient Protection and Affordable Care Act, which President Obama had signed into law in March, would have only a minimal long-term impact on ­managed-care companies. WellPoint’s stock shot above $80 in early July before tumbling with the rest of the market; it ended August at $63.30, for a gain of 12.2 percent that lagged the sector by 16.7 percentage points but bested the broad market’s 3.5 advance over the period.