Index fund
A mutual fund or ETF that holds every stock in a market index (like the S&P 500) instead of picking individual stocks. Cheap, diversified, boring — and that's the point.
An index fund is a fund whose holdings mechanically mirror a market index. An S&P 500 index fund holds all 500 companies in the S&P 500 in the same proportions as the index itself. No human is picking stocks; the fund just tracks the index.
This passive approach has two big advantages:
- Low cost. No analysts, no research, no active trading — so expense ratios are typically 0.03-0.10%, a fraction of actively managed funds.
- Hard to lose to. The S&P 500 is, by definition, the average of the 500 largest US companies. Beating the average consistently is extraordinarily hard — even professional fund managers underperform the index more than half the time over 10-year windows.
For most individual investors, a few broad index funds (US total market, international, bonds) covers the vast majority of what they need. It's not exciting. It's not clever. It's just steady, diversified, low-cost ownership of the global economy.
ETFs are a close cousin — same idea, different legal structure. Most modern index investors use ETFs, but the practical difference is minor for buy-and-hold investors.
See also
- ETF (Exchange-Traded Fund) — A basket of stocks (or bonds, commodities) that trades on a stock exchange like a single stock. Most ETFs track an index.
- Expense ratio — The annual fee a mutual fund or ETF charges as a percentage of your invested amount. Compounds against you every year.
- Diversification — Spreading your investments across many holdings so that no single one can sink your portfolio. The only free lunch in investing.
- Asset allocation — How you split your investments across asset classes — typically stocks, bonds, and cash. The biggest driver of long-term returns and volatility.
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