Canada's S&P/TSX Composite Index is tracking to beat the US S&P 500 Index for a second consecutive year, which would mark the first back-to-back victory in 15 years. The Toronto benchmark has gained 9.9% year-to-date, narrowly ahead of the S&P 500's 9.6% advance.

Five major banks — Royal Bank of Canada, Toronto-Dominion Bank, Bank of Montreal, Canadian Imperial Bank of Commerce, and Bank of Nova Scotia — have driven roughly 60% of the TSX's gains. These lenders contributed nearly 1,997 points to the index's 3,145-point rise, fueled by a commodities boom that's underpinning the Canadian economy.

In contrast, US gains concentrate in chipmakers, with Micron Technology and peers like Nvidia and Qualcomm accounting for most S&P 500 momentum. Canada's broader market participation includes gold miners, oil producers, and tech stocks, suggesting more diversified strength than the AI-driven US rally.

However, bank valuations raise concerns. Canadian bank stocks trade at their highest price-to-book values since the global financial crisis. While strategists expect the economic cycle to continue supporting gains, they anticipate other sectors will drive performance as the year progresses. The concentration risk in financials makes sustained outperformance uncertain.