A big return can be very persuasive. Spot an investment that has gained 209% and it can be hard not to feel the pull to invest in it. However, a headline figure only tells you where an investment finished. It says nothing about how it got there, how much it lurched along the way, or whether it adds anything to what you already hold.
Was the result driven by a small number of companies, a particular market environment or a period of unusually strong investor demand? And what might the investment’s performance look like when those conditions change?
The return matters, but understanding what drove it can tell you much more about the investment and the experience of holding it over time.
The timeframe changes the story
Consider Bitcoin and the Betashares NDQ Nasdaq 100 ETF over the same two windows:
| Return to 30 September 2026 | 1 year | 3 years |
|---|---|---|
| Bitcoin | −26.20% | +209% |
| Betashares Nasdaq 100 ETF | +16.88% | +92.51% |
Source: Betashares and MarketWatch. Returns to 30 September 2026. NDQ performance is net of management fees. Past performance is not an indicator of future performance. Bitcoin performance is shown in US dollars and does not take into account USD/AUD currency movements.
Over three years, Bitcoin returned far more than NDQ. Shorten the window to a single year and the picture flips: Bitcoin fell 26% while NDQ rose.
Part of the point is that these are very different investments. Bitcoin is a single digital asset and is considered an extremely high volatility investment because its price is driven almost entirely by shifting sentiment rather than by any underlying cash flows.
Meanwhile, NDQ aims to track the Nasdaq 100 which comprises 100 of the largest non-financial companies listed on the Nasdaq. It’s currently concentrated by large technology companies like the Magnificent 7 but also gives exposure to a group of businesses with different earnings sources like Costco.
However, Bitcoin’s larger return wasn’t simply a better version of the NDQ’s return. It came from a very different asset, with a different set of influences and a different experience for someone holding it.
The comparison isn’t a contest between the two. It shows why a return needs context: the timeframe, the investment’s underlying exposure and the volatility an investor may experience along the way.
Look beyond the number
A return without a timeframe doesn’t tell the full story. For example, a 20% return over a month means something very different from a 20% return over five years.
The same applies to a loss: a fall over a few weeks may reflect normal market movement, while a longer-term decline may point to a structural change.
It’s also useful to compare an ETF’s performance with the benchmark it aims to track, over the same period. For example, NDQ can be compared with the Nasdaq 100 Index.
If the index rose 10% and the ETF rose 8%, the ETF delivered a positive return but lagged its benchmark. This is known as tracking error and helps show how closely the ETF followed its index.
To put a performance figure in context, start with three questions:
- What period does it cover?
- How did the relevant benchmark perform?
- What drove the result?
For example, was the return spread across a broad group of holdings, or did a small number of companies make most of the difference? That context can tell you more than the headline return alone.
What would it add to your portfolio?
An investment may help diversify a portfolio if it has different return drivers or tends not to move in step with the other investments you hold. But diversification depends on how your holdings behave together, not just on whether they look different. Those relationships can change, and a different source of return can still bring significant risk.
A strong performer can also add almost no diversification if it simply doubles up on exposure you already have. For example, NDQ aims to track the Nasdaq 100 index, so it’s heavily weighted to large US technology companies.
If you already hold a global or US shares investment, many of those same names are likely in there too. Adding NDQ on top might deepen that concentration rather than broaden your portfolio.
Bitcoin has different drivers from company shares, but that doesn’t automatically make it a stabilising addition. It is a single digital asset with its own risks and sharp price movements and volatility.
The useful question is: what role would this investment play alongside what you already own? Would it broaden your exposure, increase an existing concentration or change your portfolio’s overall risk profile? Its past return can prompt you to investigate, but it can’t answer those questions on its own therefore it’s not an accurate or reliable predictor of future performance.
Treat performance as a prompt, not a conclusion
A headline return is a question, not an answer. A strong one is worth investigating. A weak one is worth understanding. Neither is a reason to act on its own, because both describe the past, and you’re investing in the future. Importantly, past performance is not an accurate or reliable indicator of future performance or investment returns.
So before the number decides for you, turn it around: what role would this play alongside what you already own, and does it move you closer to where you’re trying to get? That’s the test a return can’t pass on your behalf.
