The Globe and Mail reports in its Monday edition that Canadian lifecos were underperformers in 2025, lagging financials and the S&P/ TSX Composite Index. Guest columnist Amber Kanwar writes that it is against this backdrop that Sun Life, Manulife and Great-West Life report results this week. Sun Life had specific challenges around its U.S. health care insurance program, particularly because of high-cost medical claims that investors are hoping are behind them. Sun Life was the key reason insurance stocks underperformed. "A turnaround of SLF's U.S. Group businesses could be the biggest driver of performance within the group," wrote National Bank analyst Gabriel Dechaine in a preview note. "In the near-term, we believe [Sun Life] is the one to watch. It has accelerated its buyback activity in recent months. A significant increase to its program size (i.e., to 4 per cent of shares outstanding) could be another positive catalyst for the stock," wrote Mr. Dechaine.