The S&P 500 reached a new all-time high this week despite ongoing concerns about trade policy, elevated interest rates, and geopolitical tensions. The market's strength reflects several factors including robust corporate earnings, strong consumer spending among higher-income households, and continued enthusiasm for AI-related stocks that are delivering exceptional revenue growth.
Market breadth remains a concern among strategists. The S&P 500's gains are highly concentrated in a small number of technology mega-caps, with the median stock in the index significantly underperforming the headline number. This concentration increases index volatility and means most actively managed equity portfolios are lagging benchmarks. Valuation multiples for the largest technology companies have stretched to levels that require sustained earnings growth to justify.
