GlossaryConcept
What Is an ETF (Exchange-Traded Fund)?
An ETF (exchange-traded fund) is an investment fund that trades on a stock exchange like a share and tracks an index, a commodity or a basket of assets, including crypto assets such as bitcoin.
By COINOTAG Research DeskLast updated Sources
What Is an ETF?
An ETF (exchange-traded fund) is an investment fund whose shares trade on an exchange like a stock and that tracks an index, a commodity or a basket of assets. Investors buy fund shares and, through them, own part of the fund's portfolio.
In crypto, the term reached a wide audience when spot Bitcoin products began trading in the US in 2024. How those products work is covered in a separate guide: What is a spot Bitcoin ETF? ETFs themselves are a much wider product family that covers stock, bond and commodity indexes.
How Does It Work?
ETF shares trade on the exchange throughout the day at market prices. The fund's underlying value is its net asset value (NAV), the portfolio's value per share. Large firms called authorized participants can create new shares by delivering assets or cash to the fund, or redeem shares to take assets back. This creation and redemption process is the arbitrage channel that keeps the market price close to NAV.
According to Investor.gov, ETFs in the US are registered with the SEC as open-end investment companies or unit investment trusts. Spot Bitcoin products technically fall outside that group: they are listed as exchange-traded products (ETPs) structured as commodity-based trusts, although everyday usage calls them ETFs.
History and Evolution
The fund generally regarded as the first US ETF, tracking the S&P 500, began trading in 1993. Index ETFs went on to become a core tool for low-cost index investing.
On the crypto side, the first US ETF based on Bitcoin futures began trading in October 2021. On January 10, 2024 the SEC approved the listing of spot Bitcoin ETPs. Ether-based products were approved for listing by an SEC order dated May 23, 2024 and began trading in July 2024.
Key Concepts
- NAV (net asset value): the portfolio's value per share.
- Premium / discount: the market price trading above or below NAV.
- Custodian: the firm that safekeeps the fund's underlying assets.
- Tracking difference: how far the fund's return drifts from its index or asset.
Spot ETF vs Futures ETF
| Spot ETF | Futures ETF | |
|---|---|---|
| Underlying | The asset itself (e.g. bitcoin) | Futures contracts on the asset |
| Custody | A custodian holds the asset | The fund holds contracts and cash collateral |
| Tracking error | Mainly from fees | Contract roll costs can widen the gap |
| Cost | Expense ratio | Expense ratio plus roll and futures-curve effects |
A futures ETF has to keep rolling expiring contracts; when futures trade above spot, each roll can cost a little.
How Spot Bitcoin ETFs Work in Brief
When new money enters a spot Bitcoin ETF, the fund increases the amount of Bitcoin held with its custodian; when money leaves, that amount shrinks. The share price follows the value of the bitcoin the fund holds per share. Mechanics, fees and risks are covered in the guide; the current market is on the Bitcoin price page.
Index ETFs: S&P 500, Nasdaq-100, Russell 2000 and Sector ETFs
Most ETFs track an index. Four well-known examples from traditional finance (TradFi):
- S&P 500 ETF: tracks 500 large US companies. Example: SPY ETF price.
- Nasdaq-100 ETF: tracks the 100 largest non-financial companies listed on Nasdaq. Example: QQQ ETF price.
- Russell 2000 ETF: tracks US small-cap companies. Example: IWM ETF price.
- XLE ETF: tracks the energy companies of the S&P 500 as a sector index. Example: XLE ETF price.
For a chart and level view of one of these funds, see SPY ETF technical analysis.
ETF Costs: Expense Ratio, Premium/Discount, Tracking Difference
- Expense ratio: per Investor.gov, the percentage of a fund's average net assets used each year to pay its operating expenses. It is deducted from the fund's value, not billed separately.
- Premium / discount: Investor.gov notes that an ETF's market price may differ from NAV, so an investor may pay more or receive less than NAV.
- Tracking difference: fees, cash holdings and roll costs can make the fund's return drift from its index.
- Brokerage costs: commissions and the bid-ask spread sit outside the fund.
ETF vs Holding the Asset Directly
Buying a crypto ETF is not the same as owning the coin. The investor owns fund shares, holds no private keys and cannot withdraw the coin to a wallet or use it on-chain; in exchange, the fund handles custody and the shares sit in an ordinary brokerage account next to other securities. Trading hours differ too: ETF shares trade only while the exchange is open, whereas crypto markets run around the clock, weekends included, so moves that happen while the exchange is closed reach the ETF price only at the next open. Someone holding the asset directly manages the keys, for example with a cold wallet, and carries the security responsibility. A similar split exists on the equity side between a stock and a tokenized stock represented on a blockchain.
Access by Country
Access to ETFs depends on country and broker. Two dated examples: in the US, spot Bitcoin ETPs were listed after the SEC approval of January 10, 2024; in Hong Kong, the first spot Bitcoin and Ether ETFs were listed on April 30, 2024. Rules elsewhere differ and can change; the local regulator's current notices are the reference.
Practical Example
Example (made-up numbers): if a fund's NAV is $40.00 per share and its shares trade at $40.08, it trades at a premium of about 0.2%. With an expense ratio of 0.25% a year, the annual fund cost on a $10,000 position is about $25, deducted inside the price.
Futures ETF example (made-up numbers): suppose the spot price of the underlying stays flat at $100 for a year. If the fund sells each expiring contract and buys the next month's contract 0.5% higher, its return can end the year several points behind spot even though the price never moved. That is what the cost gap between spot and futures ETFs means in practice.
Related Terms and Next Steps
To evaluate ETFs, it helps to look at the index ETF entries, the difference between a stock and a tokenized stock, and cold wallets on the custody side. For ongoing developments, follow Bitcoin news and TradFi news; for prices, see US stocks, ETFs and commodities prices.
Frequently Asked Questions
What is an ETF?
An ETF (exchange-traded fund) is an investment fund whose shares trade on an exchange like a stock while it tracks an index, a commodity or a basket of assets. Investors own part of the portfolio through their fund shares.
What is the difference between a spot ETF and a futures ETF?
A spot ETF holds the underlying asset with a custodian. A futures ETF holds futures contracts on the asset and rolls them regularly; those roll costs can make its return drift further from the asset.
Is an ETF a stock?
No. An ETF is a fund, but its shares trade on an exchange like a stock, at market prices during the trading day. Shareholders own the fund's portfolio indirectly.
What is an expense ratio?
The expense ratio is the percentage of a fund's average net assets used each year to pay operating expenses. It is not billed separately; it is deducted from the fund's value day by day.
Does buying a crypto ETF mean owning the coin?
No. A crypto ETF buyer owns fund shares, holds no private keys and cannot withdraw the coin to a wallet. The fund handles custody. Owning the coin means managing the keys and security yourself.
Do ETFs pay dividends?
ETFs that hold dividend-paying stocks usually pass that income on to shareholders. Funds that hold an asset that produces no income, such as spot Bitcoin products, have no dividend to distribute.