When the SEC approved spot Bitcoin ETFs in January 2024, it opened the door for mainstream investors to gain Bitcoin exposure through regular brokerage accounts. Two funds quickly dominated the market: IBIT from BlackRock and FBTC from Fidelity. Together they hold the majority of all spot Bitcoin ETF assets. Here is how they compare.
The Spot Bitcoin ETF Landscape
Before diving into IBIT vs FBTC, it helps to understand what spot Bitcoin ETFs do. Unlike Bitcoin futures ETFs that use derivative contracts, spot Bitcoin ETFs hold actual Bitcoin in cold storage. When you buy shares, the fund buys and stores real Bitcoin on your behalf. The share price tracks the spot (current) price of Bitcoin, minus fees.
This was a landmark development because it removed the need for investors to set up crypto exchange accounts, manage private keys, or worry about custodial security. You buy shares through your brokerage just like any other ETF. For more background, see our cryptocurrency ETFs guide.
IBIT: BlackRock's iShares Bitcoin Trust
IBIT launched on January 11, 2024, and quickly became the fastest-growing ETF in history. Within months, it amassed tens of billions in assets, making it one of the largest ETFs of any kind.
IBIT charges an expense ratio of 0.25% (after an initial promotional period with lower or waived fees). It uses Coinbase Custody as its primary custodian, meaning Coinbase secures the physical Bitcoin in cold storage.
BlackRock's brand recognition and distribution network were major factors in IBIT's rapid growth. Institutional investors, financial advisors, and wealth managers who already work with BlackRock found it natural to adopt IBIT.
FBTC: Fidelity Wise Origin Bitcoin Fund
FBTC also launched on January 11, 2024, alongside IBIT and several other spot Bitcoin ETFs. While it attracted slightly less assets than IBIT, FBTC is firmly the second-largest spot Bitcoin ETF.
FBTC charges the same 0.25% expense ratio as IBIT. Its key differentiator is custody: Fidelity uses its own Fidelity Digital Assets subsidiary to custody the Bitcoin. This means Fidelity handles both the fund management and the security of the underlying Bitcoin, without relying on a third-party crypto custodian.
For investors who prefer Fidelity's integrated approach and trust their security infrastructure, this self-custody model is a meaningful distinction.
Fees and Costs
Both IBIT and FBTC charge a 0.25% annual expense ratio. On a $10,000 investment, that is $25 per year. Both funds offered temporary fee waivers during their initial launch period to attract assets, but those promotions have since expired.
At 0.25%, these funds are more expensive than broad market ETFs like VOO (0.03%) but quite competitive for a specialized product. Compared to buying Bitcoin on a crypto exchange, where trading fees can range from 0.5% to 1.5% per transaction, holding an ETF for the long term is often cheaper if you are not trading frequently. Understanding how expense ratios work helps put this cost in perspective.
Liquidity and Trading
IBIT has a commanding lead in daily trading volume. It is one of the most actively traded ETFs in the entire market, not just among Bitcoin funds. This high volume produces exceptionally tight bid-ask spreads, meaning you can buy and sell at prices very close to the fund's net asset value.
FBTC is also liquid by any reasonable standard, but its daily volume is lower than IBIT's. For retail investors buying $1,000 or even $50,000 at a time, both funds offer more than adequate liquidity. The difference matters more for institutional traders moving millions of dollars in a single trade.
Custody: The Real Difference
This is the most substantive distinction between the two funds. IBIT's Bitcoin is held by Coinbase Custody, a regulated institutional custodian that secures Bitcoin for many other ETFs and institutional clients. Coinbase is a publicly traded company with established security practices.
FBTC's Bitcoin is held by Fidelity Digital Assets, a subsidiary that Fidelity has operated since 2018. Fidelity was one of the first traditional financial institutions to build its own crypto custody infrastructure.
Some investors prefer Fidelity's self-custody approach because it avoids concentration risk -- if something happened to Coinbase, multiple Bitcoin ETFs (not just IBIT) would be affected. Others prefer Coinbase's specialization in crypto custody and its proven track record of securing hundreds of billions in digital assets.
Neither custodial model is objectively safer. Both use institutional-grade cold storage, multi-signature wallets, and extensive security protocols. The choice reflects a preference for concentration risk management rather than a clear safety advantage.
Performance Tracking
Both funds track the spot price of Bitcoin, so their returns should be nearly identical after fees. Over any measurement period, the difference in performance between IBIT and FBTC is typically less than 0.05% -- attributable to minor differences in trading costs, cash management, and the timing of Bitcoin purchases.
If one fund consistently outperformed the other by a meaningful margin, it would signal an operational issue. So far, both have tracked Bitcoin's price closely and consistently.
Other Spot Bitcoin ETFs
IBIT and FBTC are not the only options. Several other spot Bitcoin ETFs launched alongside them, including BITB (Bitwise), ARKB (ARK/21Shares), and HODL (VanEck). Some of these charge lower fees (Bitwise cut to 0.20%) but have smaller assets and lower liquidity. For most investors, the liquidity and brand reliability of IBIT or FBTC justifies the marginal fee difference.
The Verdict: IBIT or FBTC?
Choose IBIT if: You want the most liquid spot Bitcoin ETF with the tightest spreads and deepest options market. You are comfortable with Coinbase as the custodian and value BlackRock's institutional track record.
Choose FBTC if: You prefer Fidelity's self-custody model and want to avoid concentration risk at a third-party crypto custodian. You already use Fidelity as your brokerage and like keeping everything on one platform.
The reality: Both funds give you the same thing -- exposure to Bitcoin's spot price through a regulated, liquid ETF. The custodian difference is worth considering but unlikely to affect your returns. Pick the one that fits your brokerage setup and provider preference, and focus your analysis on whether Bitcoin itself belongs in your portfolio.
Use the IBIT vs FBTC comparison tool for live performance data, and read our cryptocurrency ETFs overview for the broader digital asset ETF landscape. Explore all available ETFs in our directory.
