What Is a Bitcoin ETF? (and How Spot ETFs Work)
A spot Bitcoin fund holds actual bitcoin and issues shares you can buy and sell on a normal stock exchange. Spot Ethereum funds work the same way with ether. So you skip the wallets, exchanges, and private keys, and you get to invest in cryptocurrency through a brokerage account you probably already have. This fits the same core principles of ETF investing you already use for index funds.
The fund handles custody, security, and the operational work of holding crypto. You hold shares, and the shares track the price of the underlying asset.
Investment Objective: Tracking the Underlying Asset
Every spot crypto fund in this guide shares the same goal. The fund objective is to reflect the performance of the underlying asset’s price, before fees and expenses. The investment objective for the iShares Bitcoin Trust ETF specifically states the fund “seeks to reflect generally the performance of the price of bitcoin.” Ether-focused funds have parallel investment objective language for ether.
When bitcoin moves 5% on a given day, you’d expect the share price to move close to 5% as well, with small variations from fees.
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How Spot Crypto ETFs Hold Digital Assets and Are Regulated
Spot Bitcoin and Ethereum ETFs hold digital assets directly, and the regulatory wrapper differs from what most ETF investors are used to. The U.S. Securities and Exchange Commission approved these funds on January 10, 2024, with strict disclosure requirements. The SEC was clear that approval was not an endorsement of bitcoin as an investment.1
Here’s the part you need to pay close attention to: These funds are not registered as investment companies under the Investment Company Act of 1940, and do not have the same regulatory requirements as mutual funds or ETFs registered under that act.2 The protections that come with being an investment company registered under that act do not all apply to spot crypto funds.
The funds are structured as grantor trusts or similar pass-through vehicles, and each one trades as an exchange traded product on a major U.S. exchange. They are not commodity pools regulated under the Commodity Exchange Act either. A commodity pool would carry CFTC oversight that these spot funds do not. The fund’s prospectus spells out the structure and risks in detail.
So the same regulatory requirements that apply to a typical equity ETF do not all apply to spot crypto funds. The SEC reviewed the disclosures, the listing exchange approved the listings, and the funds operate under their own investment programs. Some protections built into the rules for registered funds are simply not there.
Best Spot Bitcoin ETFs for 2026
Four spot Bitcoin funds cover the bulk of investor money in this category. Here’s how they stack up against each other, sized against the largest ETFs in the market for context.
iShares Bitcoin Trust ETF (IBIT)
IBIT is the dominant fund in the category. As of May 2026, IBIT holds approximately $66.7 billion in net assets, more than five times the next-largest fund in the category, with a 0.25% sponsor fee.3 For every $10,000 invested, that 0.25% works out to $25 per year in fund expenses, taken from the trust’s bitcoin holdings.
What stands out about IBIT is how sticky the money is. Even when bitcoin’s market price fell sharply during the first quarter of 2026, IBIT’s net assets held roughly flat while shares outstanding actually grew. Other ishares funds show similar institutional patterns, but IBIT’s market value at scale puts it in a league of its own.
How Net Assets Compare Across the Funds
Across the four Bitcoin funds, IBIT’s $66.7 billion lead is wide. FBTC sits second at $12.74 billion, followed by BITB at $3.15 billion. Net assets affect liquidity and the ability to handle large trades without slippage.
Fidelity Wise Origin Bitcoin Fund (FBTC)
FBTC is the second-largest fund in this lineup and Fidelity’s entry. As of Q1 2026, the fund holds about $12.74 billion in net assets across roughly 190,800 BTC. FBTC charges a 0.25% sponsor fee, and it is the only major spot Bitcoin product that custodies its bitcoin in-house, through Fidelity Digital Asset Services rather than Coinbase Custody.4
For Fidelity customers, FBTC slots cleanly into existing accounts. The in-house custody puts Fidelity in direct control of the bitcoin rather than leaving it with a third-party crypto custodian.
Grayscale Bitcoin Mini Trust ETF (BTC)
BTC is Grayscale’s value entry in the category. The fund charges a 0.15% management fee, the lowest among the major spot Bitcoin funds covered here, and trades as an exchange traded product.5
The math is simple, here is how it works: For every $10,000 invested, BTC’s 0.15% works out to $15 per year, against $25 for IBIT and FBTC. Over a long holding period, that 10 basis point gap compounds in your favor. The trade-off is size though, BTC is smaller and newer than IBIT, so trading volume and liquidity are lower. For cost-sensitive buyers planning to hold for years, the lower management fees can easily outweigh that disadvantage.
Bitwise Bitcoin ETF (BITB)
BITB is the specialist crypto firm entry, with a competitive 0.20% fee that sits between the major issuers and Grayscale’s BTC. Bitwise is a crypto-native asset manager, appealing to investors who want a fund run by a team focused entirely on digital assets. As of May 2026, BITB holds about $3.15 billion in net assets and 38,576 BTC, with Coinbase Custody Trust Company as the bitcoin custodian. The 30-day median bid-ask spread runs around 0.02%, in line with the larger funds.
Best Spot Ethereum Trust ETF Picks
Three spot ether trust ETF options cover most of the Ethereum side. Two have “Trust” in their formal names, while Grayscale’s mini ether fund uses “Staking Mini ETF” instead.
iShares Ethereum Trust ETF (ETHA)
ETHA is BlackRock’s Ethereum entry and the largest spot ether trust ETF. As of May 2026, the fund holds about $7.5 billion in net assets across roughly 3.16 million ETH, charging a 0.25% sponsor fee.6 For every $10,000 invested, that’s $25 per year in fees.
ETHA grew from about $3.6 billion at year-end 2024 to over $10 billion at year-end 2025 before the Q1 2026 pullback. The fund mirrors IBIT’s pattern as the dominant choice in its category, with strong liquidity and a tight 30-day median bid-ask spread of 0.06%.
Grayscale Ethereum Staking Mini ETF (ETH)
ETH is the lowest-fee Ethereum option and the only fund here that stakes its ether holdings. The management fee is 0.15%, and as of May 2026, about 79% of the fund’s ether is staked, generating roughly 2.33% in net staking rewards passed through to shareholders monthly.7
The math here is impactful. For every $10,000 invested, the 0.15% management fee works out to just $15 per year, while staking generates roughly $233 per year in net rewards. ETH earns a roughly 2.33% staking yield no matter which way ether moves.
The real trade-off is staking adds operational complexity the non-staking funds don’t carry. Staked ether is locked up for periods set by the protocol, and the staking process carries smart-contract and validator risk. The reward rate floats with network conditions and could decline.
Fidelity Ethereum Fund (FETH)
FETH is Fidelity’s Ethereum entry and the parallel to FBTC on the Bitcoin side. The fund charges a 0.25% sponsor fee and custodies its ether in-house through Fidelity Digital Assets instead of Coinbase Custody. As of April 30, 2026, FETH held approximately $1.22 billion in net assets across roughly 574,083 ETH.8
FETH does not stake. So you trade away the staking yield for the simplest possible structure. For Fidelity customers, the fund integrates seamlessly into existing accounts.
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Net Asset Value, Market Price, and How Shares Trade
Shares of these funds trade on the secondary market like any other ETF. The fund’s NAV is calculated daily, based on the underlying asset’s reference rate at a set time. However, the market price you pay or receive can be slightly different from the underlying NAV. Why?
The mechanism that keeps them aligned is creation and redemption by authorized participants. When the market price drifts above NAV, large traders create new shares and sell them, pushing the price down. When the market price drifts below NAV, they redeem shares, pushing the price up. Market price returns and net asset value nav returns track closely over time.
Most spot Bitcoin and Ethereum ETFs use cash-only creation and redemption, which is different from how most equity ETFs vs. mutual funds typically work. The closing price of the fund on any given trading day reflects the last trade. The investor’s shares are valued at the market price for purposes of their account statement, not at NAV.
The investment return on your statement is therefore based on the market price. The market value of a position can be affected by the spread between bid and ask prices, and by management fees within the fund.
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Risks Before You Buy
These funds hold real bitcoin or ether, and the volatility comes through unfiltered. Investing involves significant risks every potential buyer needs to understand before placing a trade.
The biggest risk is extreme price volatility. Bitcoin and ether have both seen drawdowns of 70% or more from their peaks, with no cap on the downside. So just know upfront that you could lose money, including a large portion of your principal value. Past performance does not guarantee future results, and a sharp price move can adversely affect the value of the shares with little warning.
Also, these ETFs are not insured by the Federal Deposit Insurance Corporation. If something goes wrong with the digital asset network, the custodian, or the fund’s operations, your investment is not protected the way bank deposits are.
Custody risk is also real. The funds rely on third-party custodians to hold and transfer digital assets safely. A custody failure could affect the value of the shares. Digital assets represent a new and rapidly evolving industry, and the underlying technology is still maturing. The fund’s prospectus lays out the full risk factors in detail.
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How These Fit in a Portfolio
For most investors, spot crypto ETFs work best as a small satellite alongside a broader investment portfolio built on index funds. A 1% to 5% slice gives you exposure without putting your retirement at risk if bitcoin or ether goes through another big drawdown. The rest of a simple 3-fund portfolio does the heavy lifting for long-term wealth building.
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When to Talk to a Financial Professional
If you’re not clear on how to size a crypto allocation against your other holdings, or how the tax treatment works in your accounts, talk to a financial professional. A good advisor can help you weigh the investment decision against your full picture.
For investors who’d rather hold tokens directly than through an ETF wrapper, that option stays open. You’d buy bitcoin or ether on an exchange like Coinbase, then either keep the tokens in the exchange account or move them into a self-custody wallet like Coinbase Wallet, where you hold the private keys.
For stronger security, many investors use hardware cold storage wallets such as Ledger or Trezor. Ledger devices, including the Nano X and Nano S Plus, support thousands of cryptocurrencies and offer offline storage with the Nano X adding Bluetooth connectivity. Trezor wallets, including the Model T and Model One, focus on open-source security, with the Model T featuring a touchscreen for easier transaction verification. Both brands support hundreds of cryptocurrencies and are widely used for long-term storage.
The best cryptocurrency platforms in the U.S. cover the full list of options. The trade-off is operational complexity. You handle the custody and security yourself, plus any tax reporting that comes with holding tokens directly.
Putting It All Together
Spot Bitcoin and Ethereum ETFs make crypto exposure simple for investors comfortable with brokerage accounts. The seven funds covered here all hold actual bitcoin or ether, charge between 0.15% and 0.25% in fees, and trade like any other ETF. Pick one that fits your priorities on cost, custody, and yield, keep the allocation small, and let the rest of your portfolio do its work.
