Do the recent five-year returns from market index funds vary widely?
They can vary, but not as wildly as it might seem from headlines—most broad, low‑cost market index funds with similar mandates cluster fairly tightly over five‑year periods, with bigger gaps only when the underlying exposures differ meaningfully.
When returns are similar
Among
funds that track the same index (e.g., multiple S&P 500
index funds), five‑year differences are usually small, often within roughly
0.2–1% per year, driven mainly by expense ratios, tracking error, and tiny
implementation differences. Over a full five‑year span that might add up to a
couple of percentage points in cumulative performance, but not tens of
percentage points.
When returns diverge more
Five‑year
returns do spread out once you compare funds tracking
different parts of the market:
- U.S. large‑cap vs U.S. small‑cap.
- U.S. vs developed ex‑U.S. vs emerging markets.
- Equity vs bond index funds.
Because those segments have had very different annual results (e.g., big swings in equities vs more muted bond returns in the same years), the compounded five‑year numbers can diverge quite a bit, sometimes by double‑digit percentage points cumulatively.
How to think about it as an investor
- Within a given asset class and index, focus on costs
and tracking quality, not performance differences, because the underlying
index drives almost all of the return.
- Across different index types, expect five‑year returns
to be meaningfully different and make sure the mix you look at matches
your actual allocation, not just one headline index.
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