VOO is the world's largest ETF by assets under management, having surpassed SPY in recent years as investors have recognized the cost advantage and tax efficiency advantages of its open-end fund structure. It tracks the S&P 500 at 0.03% — identical to IVV — making it one of the least expensive ways to own the 500 largest US companies. The S&P 500 is a capitalization-weighted index, meaning Apple, Microsoft, NVIDIA, Amazon and Alphabet together represent roughly 25-30% of the fund — the performance of these few companies drives a disproportionate share of returns. Over the past two decades, simply owning VOO has outperformed the vast majority of actively managed US equity funds, validating the core index investing thesis. The fund accumulates dividends efficiently and its open-end structure allows daily dividend reinvestment, avoiding the cash drag of SPY's trust structure. For investors, VOO represents the simplest and most effective single investment for long-term wealth accumulation — it provides instant diversification across the 500 largest US companies, captures the full return of the US equity market, requires no manager selection decisions and costs essentially nothing to own. It is appropriate as a core holding for virtually every equity investor with a multi-year time horizon.
