Sector / thematic ETF.
In plain English
A sector ETF owns the stocks of a single part of the market, such as health care or financials, while a thematic ETF bundles companies tied to a trend or idea, like artificial intelligence or clean energy. Both give focused exposure without picking individual stocks. The tradeoff is concentration: they rise and fall harder than a broad index because they lack diversification across the whole market, and thematic funds in particular often launch after a trend is already hot and can carry higher fees. They are a targeted bet, not a core holding.
01Why it matters
These funds concentrate your money in one slice of the market, so they swing more than a broad index and are easy to buy at the top of a hot trend, which is worth understanding first.
02The math, step by step
A clean-energy thematic ETF soars when the theme is popular, then falls sharply when sentiment cools, moving far more than a total-market fund because all its holdings rise and fall together.
03What this is NOT
A sector or thematic ETF is NOT broadly diversified. It concentrates in one industry or trend, so it carries more risk than a total-market fund and is better as a small satellite position than a core one.
04Receipts
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Plain-English answers from our glossary. Receipts included. Never advice.
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