If the S&P 500 is up 10%, why isn't my portfolio? Because the S&P 500 is cap-weighted: seven stocks absorb about a third of every dollar, and the top 10 holdings make up 35–55% of most S&P funds. In 2026 those mega-caps lagged — the Mag Seven are collectively negative — while sectors like energy (+28.1%) and technology (+26.8%) led. If your ETFs overlap in the same top names, you own the laggards several times over. The fix starts with knowing what you actually own.
If the S&P 500 is up 10%, why isn't my portfolio? Because the S&P 500 is cap-weighted: seven stocks absorb about a third of every dollar, and the top 10 holdings make up 35–55% of most S&P funds. In 2026 those mega-caps lagged — the Mag Seven are collectively negative — while sectors like energy (+28.1%) and technology (+26.8%) led. If your ETFs overlap in the same top names, you own the laggards several times over. The fix starts with knowing what you actually own.