ETF v praxi
How to choose a sector ETF — and why a broad index is usually enough
Key takeaways
- A sector ETF gives you targeted exposure to one industry, but you give up diversification across sectors.
- Key selection criteria: TER (cost), fund size, underlying index and domicile (prefer Irish UCITS).
- Most sector ETFs hold companies only from the US or only from developed markets — watch for geographic blind spots.
- Historically a broad global index outperforms most sector strategies on a 10-year-plus horizon.
- A sector ETF makes sense as a complement, not as the core of a portfolio.
A sector ETF is a fund focused on a single industry — healthcare, technology, energy or even defence. The appeal is the ability to bet on a theme that is currently driving markets. But it comes with rules and pitfalls.
What a sector ETF offers
Instead of hundreds of companies from the whole market, you buy a basket of perhaps fifty healthcare companies. You get concentrated exposure to a sector you consider promising — healthcare, space, clean energy. For an investor who wants to add exposure to, say, JNJ or Roche without picking individual shares, a sector ETF is the logical route.
What matters when choosing
- TER (cost): sector funds tend to be more expensive than global indices — compare what you pay per year.
- Underlying index: two funds called "healthcare" may track completely different indices with different compositions.
- Fund size and liquidity: small funds may have wider spreads and a risk of closure.
- Domicile and tax efficiency: an Irish UCITS fund is generally most efficient for Czech investors — see why Irish domicile.
- Accumulating vs. distributing: depends on your preferences — see the share class comparison.
Why a broad index is usually enough
Research repeatedly shows: timing sector rotation is extremely difficult. The sector that drove the past three years (e.g. technology 2017–2019) may lag for the next five. A global fund such as MSCI World or FTSE All-World automatically allocates to sectors according to their market weight and rebalances as the economy changes.
How to apply this in practice
If you have just been reading healthcare company analyses and want to add healthcare as a whole to your portfolio, XDWH is a logical choice. For defence and space exposure, look at JEDI or DFND. But always ask: does this fund add genuine diversification, or does it just duplicate what the global index already holds? An overview of available funds is in the ETF overview.
FAQ
What is a sector ETF?
A fund focused on one industry — for example healthcare, technology or defence. Instead of the whole market, you buy a basket of companies from one sector. The advantage is targeted exposure; the disadvantage is lower diversification.
Is a sector ETF safer than a direct share?
Compared to a single share, yes — a basket of companies reduces the risk of one name failing. Compared to a global index, no — a sector fund is less diversified and more sensitive to sector-specific risks.
How to choose between two healthcare ETFs?
Compare the underlying index (MSCI World Health Care vs. STOXX Europe 600 Health Care etc.), TER, fund size and domicile. Two funds with similar names can have significantly different compositions and geographic weightings.