ETFs explained without the buzzwords

An ETF is a basket of investments in a wrapper you can buy or sell on an exchange, any time the market is open.

What is an ETF?

An ETF holds a collection of underlying assets — stocks, bonds, commodities, or a mix — and issues shares that represent a slice of the whole basket. When you buy one share of an S&P 500 ETF, you effectively own a tiny piece of all 500 companies.

How ETFs are structured

Large 'authorised participants' create or redeem ETF shares directly with the fund by exchanging baskets of the underlying assets. This arbitrage mechanism is what keeps the ETF's market price close to its net asset value.

ETFs vs mutual funds

• Trading — ETFs trade intraday like stocks; mutual funds price once at the close.
• Minimums — ETFs cost one share; some mutual funds require $1,000+.
• Taxes — ETFs are usually more tax-efficient in taxable US accounts.
• Automation — mutual funds are easier for automatic fixed-dollar contributions.

Types of ETFs

Broad index ETFs

Track a wide market index. Core building blocks for long-term portfolios.

Sector and thematic ETFs

Concentrated bets on tech, energy, AI, clean energy, etc. Higher risk, use sparingly.

Bond ETFs

Diversified bond exposure without buying individual bonds.

Leveraged and inverse ETFs

Costs and hidden fees

• Expense ratio — the annual management fee, expressed as a percentage.
• Bid-ask spread — the gap between buy and sell prices; smaller for popular ETFs.
• Premium/discount — the ETF price vs its net asset value; usually tiny for liquid ETFs.
• Broker commissions — many brokers now charge zero for ETF trades.

How to use ETFs

Most long-term investors are well-served by 2–4 broad ETFs covering their home market, international stocks, and bonds. Rebalance once or twice a year, contribute regularly, and ignore the noise.