CVS Health’s Health Care Benefits segment has delivered sequential MBR improvement through 2026, reaching 87.4% in Q2 versus 89.9% a year earlier, driven by disciplined pricing, medical cost management, and stronger government business performance. Q3 typically sees higher medical utilization due to seasonal patterns, pushing the ratio above first-half levels toward the 90-93% range. Full-year 2026 guidance centers near 89.5-90.5%, reflecting prior-year reserve benefits and ongoing Aetna turnaround initiatives. Trader positioning in the Polymarket reflects this trajectory, with the 90.5-92% bucket commanding the highest implied probability ahead of the November 4 earnings release, which will provide the first detailed view of third-quarter health care costs relative to premiums.