“Which won, Bitcoin or index funds?” has a clearer answer for the last ten years than I expected, as long as you ask the question carefully. Below I put the two on the same footing using published data, point out where the data is imperfect, and then show why the answer is not a promise about the next ten years. Hypothetical figures are labeled as assumed.
The Last Ten Years, Side by Side
For the index side, Chartrow reports that, as of October 19, 2026, the S&P 500’s total return over ten years is +15.4% a year with dividends reinvested, or +318.9% cumulative. The page uses SPY as a proxy for the index (Chartrow: S&P 500 trailing returns). For Bitcoin, the In2013Dollars monthly table lists a price of $613.98 for October 2016 and $84,853.10 for October 2026, described as the USD value at the first of each month (In2013Dollars: Bitcoin price table). The page does not name its underlying data provider.
With those figures, $84,853.10 ÷ $613.98 is about 138.2 times the starting price, or roughly 64% a year compounded over ten years. In plain terms, on this data Bitcoin won the last ten years by a wide margin.
| $1,000 over 10 years (data above) | Ending value | Per year |
|---|---|---|
| S&P 500, total return | $4,189 | 15.4% |
| Bitcoin, price only | $138,202 | 64% |
Two caveats keep this honest. The Bitcoin dates are the first of October 2016 and 2026, while the S&P figure is as of October 19, 2026, so the windows are not identical. And the S&P number includes dividends while Bitcoin pays none, so I compared price for Bitcoin and total return for stocks, which is what a holder would have received.
Bitcoin or Index Funds: Why the Window Still Changes the Answer
In my view, an asset that is very volatile can look like an enormous winner over one window and a loser over another. SoFi’s price history article says Bitcoin’s price was almost $1,000 by December 2016, soared to nearly $20,000 by December 2017, and ended 2018 at $3,742 (SoFi: Bitcoin price history). Using those rounded figures, a holder at the December 2017 level would have been about 81% lower a year later. I computed that from the article’s rounded numbers, so treat it as approximate.
Why Big Swings Cost More Than an Average Suggests
An assumed illustration: $1,000 gains 100% in year one and reaches $2,000, then loses 50% in year two and ends at $1,000. The simple average of +100% and −50% is +25%, but the money ends where it started. Likewise, a drop of 81% needs a gain of about 434% to get back to even (1 ÷ 0.187 − 1). The numbers are made up in the first case, and my point is that large drops need larger gains to recover, which is why I weigh drawdowns as much as returns.
A Source I Can Cite on the Index Side
S&P Dow Jones Indices’ SPIVA report for year-end 2025 says 79% of all active large-cap U.S. equity funds underperformed the S&P 500 in 2025, compared with 65% in 2024 (S&P SPIVA U.S. Year-End 2025).
What the Ten-Year Winner Doesn’t Tell You
A result like the table above is a rear-view mirror. It doesn’t tell you how a particular buyer would have felt or behaved during the 2018 fall described above. The practical lesson I take from it is about sizing, which the next section covers.
A Practical Way to Think About This
- Don’t extrapolate one window. In my view, past performance over one period isn’t a promise about the next.
- Check which window a claim uses, and its source. The table above uses October dates from two different sources, as noted.
- Weigh drawdowns as seriously as gains. The approximate 2018 figure above shows why.
- Size any volatile position to an amount a large drop wouldn’t wreck. That’s my suggestion; I’m not giving a percentage, since I don’t have a verified basis for one.
- Keep a diversified core if you hold something volatile. That’s my view, not a recommendation for you.
Questions About Bitcoin vs Index Funds
So did Bitcoin beat the index? On the figures above, over October 2016 to October 2026, yes by a wide margin, with the caveats about dates and sources I listed.
Does past performance mean it will continue? No source I know of guarantees that, and any window is only a window.
Can I get index-fund stability and Bitcoin-like upside together? In my reasoning, higher potential upside generally comes with higher risk, so I’d expect a trade-off.
My Take on Bitcoin vs. Index Funds
This part is mine, and it is one person’s view, not a conclusion the data forces. In my view, holding a volatile asset through a full cycle takes more discipline than describing it afterward suggests. I’d study first, size the position to what a real drawdown wouldn’t wreck, and let time do more of the work than timing does. That’s an impression, not a statistic.
Sources
- Chartrow: S&P 500 trailing returns
- In2013Dollars: Bitcoin price table
- SoFi: Bitcoin price history
- S&P Dow Jones Indices: SPIVA U.S. Scorecard, Year-End 2025
Related reading: Do Active Funds Beat the Index? What Morningstar, SPIVA and a New Study Show and The Mutual Fund Capital Gains Distribution Trap — Fix It in 5 Minutes.
This article offers general information and my own opinions, not financial, tax, or legal advice. The figures in worked examples are assumed. Laws, tax rules, and products change and can differ by location, so check current official sources and talk to a qualified professional about your own situation.