Index Funds
Index funds are pooled investments designed to track the performance of a market index (S&P 500, Russell 2000, etc.) through replication or sampling.
Concept map
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Definition
Index funds are pooled investments designed to track the performance of a market index (S&P 500, Russell 2000, etc.) through replication or sampling.
Use case
Used in investment strategy workflows, analysis, and technical interviews.
Judgment check
Useful only when the assumptions and inputs behind the metric are understood.
Deep dive
How to think about Index Funds
First index fund launched by Vanguard in 1976. They offer diversification, low costs, tax efficiency (minimal capital gains distributions), and transparency. ETFs (exchange-traded) are a newer variant trading intraday like stocks. Smart beta/index variants tweak weighting by factors (value, momentum, quality).
Example: Vanguard 500 Index Fund (VFIAX) tracks S&P 500 with 0.04% expense ratio. A $10,000 investment grows with the market minus minuscule fees. SPY, the first and largest ETF, holds $400B+ in assets and trades 50M+ shares daily.