What Is a Sector ETF
Instead of the whole S&P 500, can't you hold 'just semiconductors' or 'just healthcare'? What captures that demand is the sector ETF. It's convenient, but concentration comes at a price.
The concept of a sector ETF
A sector ETF is an ETF that picks only companies belonging to a specific segment (sector) of the economy. Instead of buying the whole broad index of the S&P 500, it concentrates on one field like technology, healthcare, energy, or financials.
Thanks to this, you can diversify across an entire industry in a single trade without picking individual stocks one by one. It's essentially a tool for easily expressing the thought 'I think this industry will become important going forward.'
GICS: a globally shared industry classification
Most sector ETFs follow GICS (Global Industry Classification Standard). GICS is a classification system created by MSCI and S&P in 1999 that divides companies worldwide into 11 sectors.
The 11 sectors are information technology, healthcare, financials, consumer discretionary, consumer staples, energy, industrials, materials, communication services, real estate, and utilities.
The representative U.S. products, the 'Select Sector SPDR' series (e.g., technology XLK, healthcare XLV, financials XLF), each hold one of these 11 sectors, with each product's fee around 0.09%. Combining all 11 is effectively the same as slicing the entire S&P 500 by sector. Korea, too, has several industry-specific ETFs listed, such as semiconductors, secondary batteries, and bio.
The price of convenience: concentration risk
A sector ETF's biggest feature and weakness is that 'diversification is weak.' Since it's concentrated in one industry, when that industry does well it rises more than the whole market, but conversely when it does poorly it falls much more.
Management firms also note that sector ETFs carry 'sector risk' and 'non-diversification risk,' making price swings larger than the whole market. So that the ups and downs of a specific industry don't shake the entire portfolio, sector ETFs are often used as a supplementary weight rather than a core asset.
This article does not recommend any specific sector or product. Rather than predicting which industry will rise, understanding the risk of concentration comes first.
Preguntas frecuentes
Q. Are sector ETFs and thematic ETFs the same thing?
No. A sector ETF holds 'one industry' from a standard classification like GICS (e.g., healthcare). A thematic ETF bundles a trend spanning multiple industries, like 'electric vehicles' or 'AI.' For example, an EV theme can include autos (consumer discretionary), battery materials (materials), and semiconductors (information technology) together, crossing sector boundaries.
Q. Can I build a portfolio with sector ETFs alone?
It's possible, but if you don't hold various sectors evenly, the diversification effect weakens. Concentrating in just one or two sectors tends to make volatility and the maximum drawdown larger than a broad market index. An asset allocation that also considers the correlations among various sectors is important.
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