A simple, passive, one-fund portfolio: 100% VOO (Vanguard S&P 500). It owns the 500 largest U.S. companies. Rebalanced once a year. Low cost and diversified across big U.S. stocks, but fully exposed to stock market ups and downs.

It holds one fund: Vanguard S&P 500 ETF (VOO). That fund owns the 500 biggest U.S. companies. The portfolio stays 100% in VOO at all times—no timing or signals. Once a year, it’s reset to 100% VOO to reinvest dividends and correct small drifts.

One-fund, ultra-low-cost S&P 500 exposure (VOO) with yearly rebalance. Out-of-sample Sharpe ~2.32 vs 2.29, beta near 1, and higher risk-adjusted returns with modest drawdowns. Simple, transparent, efficient market exposure.