What Is an ETF? Exchange-Traded Funds Explained for Beginners

An ETF, or exchange-traded fund, is a basket of assets, often hundreds of stocks or bonds, bundled into a single security that trades on an exchange like an ordinary stock. One purchase gives you a slice of the entire basket, which is why ETFs became the default way for most people to own a broad market in a single trade.

Instead of buying 500 individual stocks to own the whole S&P 500, you can buy one ETF that holds them for you. This page explains what an ETF is, how it differs from a mutual fund, why its price tracks the basket, and what fund flows tell you. It is descriptive throughout.

What an ETF holds

An ETF is a fund. Behind the single ticker you buy sits a portfolio of underlying assets, and the fund's job is to hold that portfolio on your behalf. The most common type is an index ETF, which holds the same securities as a market index (for example an S&P 500 ETF holds the index's constituents) so that owning the ETF tracks the index. Others hold a sector, a country, a bond category, gold, or, more recently, cryptocurrencies through the US spot Bitcoin and Ether funds.

ETF versus mutual fund

ETFs and mutual funds both bundle many holdings into one fund, but they trade differently:

• An ETF trades on an exchange all day, so its price updates continuously and you buy and sell it at the market price like a stock.
• A mutual fund is priced once a day, after the close, and you transact at that single end-of-day value.

ETFs are also often, though not always, cheaper and passively managed, meaning they track an index rather than paying a manager to pick holdings. Those two traits, intraday trading and low cost, are much of why they grew so fast.

Why an ETF tracks its basket

An ETF's price stays close to the value of the assets it holds through a mechanism called creation and redemption. Large institutions can exchange the underlying basket of securities for new ETF shares, or hand ETF shares back for the securities, which keeps the ETF's market price tied to the value of what it holds. You do not need to use this mechanism yourself; its existence is what keeps the ETF honest to its basket.

ETF flows as a demand gauge

Because ETF shares are created when money comes in and redeemed when money leaves, the daily change in an ETF's assets is a readable measure of demand. A run of days where a fund takes in money shows buyers stepping in; a run of outflows shows the opposite. Kresmion tracks the daily flows into and out of the major US spot Bitcoin and Ether ETFs as one read on where that institutional demand is going, and you can chart an ETF's price on Kresmion alongside those flows.

Key takeaways

Frequently asked questions

What is the difference between an ETF and a stock?

A stock is a share in one company. An ETF is a fund that holds many assets at once, so a single ETF share gives you exposure to a whole basket. Both trade on an exchange the same way, but the ETF spreads your exposure across its holdings rather than concentrating it in one company.

What is the difference between an ETF and a mutual fund?

Both bundle many holdings into one fund. The main difference is how they trade: an ETF trades on an exchange throughout the day at a live price, while a mutual fund is bought and sold once a day at its end-of-day value. ETFs are also often lower cost and index-tracking.

What are ETF flows?

ETF flows are the money moving into and out of a fund, measured as the daily change in its assets. Sustained inflows show buyers adding exposure and sustained outflows show the reverse, which is why flows are watched as a demand signal. Kresmion tracks these flows for the major US spot Bitcoin and Ether ETFs.

Are ETFs safe?

An ETF spreads exposure across many holdings, which avoids the single-company risk of owning one stock, but it still rises and falls with the market or asset class it tracks. Diversification lowers one kind of risk, it does not remove market risk, and this page does not give investment advice.

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Source: exchange-traded funds are a standard pooled investment vehicle that trades on an exchange. Kresmion tracks daily fund flows for the US spot Bitcoin and Ether ETFs and charts ETF prices. This page is information, not investment advice. Kresmion Research.