Generated September 5, 2026.
Overview
FBTC and IBIT are both spot bitcoin ETFs launched in January 2024 that hold physical bitcoin directly and charge identical 0.25% expense ratios. The key distinction is scale: IBIT has accumulated $62.5B in assets versus FBTC's $13.5B, making IBIT roughly 4.5 times larger. Both offer direct bitcoin price exposure without leverage or derivatives, and neither distributes income—investors gain returns solely from bitcoin's price movement.
How they differ
The most significant difference is asset base. IBIT's $62.5B in AUM dwarfs FBTC's $13.5B, which typically translates to tighter spreads, deeper liquidity, and lower trading friction for large positions. Both launched within a day of each other (FBTC on 01/10/2024, IBIT on 01/11/2024), so neither has a head start in operational track record. Their expense ratios are identical at 0.25%, and both betas are nearly matched (FBTC at 1.8779 and IBIT at 1.8887), indicating comparable volatility relative to a broad market benchmark. The only meaningful operational difference is custody and fund structure—Fidelity uses its own institutional bitcoin custody, while iShares relies on a trust vehicle—but both hold actual bitcoin, not futures or other derivatives.
Who each is best for
- FBTC: Fits investors who prioritize exposure through a major established custodian's infrastructure and are comfortable with a smaller fund that may have tighter bid-ask spreads as its user base grows.
- IBIT: Fits investors who value the deepest available liquidity and tightest trading spreads, given its substantially larger asset base and established trading volume.
Key risks to know
- Bitcoin price volatility. Both ETFs move directly with bitcoin's price, and bitcoin exhibits the kind of sharp intraday and multiday swings that can wipe out months of gains or losses in days. Betas near 1.8779 reflect that sensitivity.
- Custody and operational risk. Although both funds hold actual bitcoin, differences in custody infrastructure and operational safeguards between Fidelity and iShares' trust model present distinct failure points. A major custody breach or operational failure at either custodian could impair the fund's ability to access or verify its bitcoin holdings.
- Regulatory risk. Bitcoin's regulatory status remains unsettled globally. Proposed restrictions on crypto trading, mining, or custody could materially alter the market value or liquidity of bitcoin holdings.
- Fund liquidity versus bitcoin liquidity. While IBIT's larger size suggests better trading spreads, if bitcoin markets themselves face a liquidity crisis (e.g., exchange outages or widespread custody freezes), both ETFs could face difficulty pricing or redeeming shares.
Bottom line
If you prioritize deep liquidity and a proven large user base, IBIT's $62.5B asset base offers practical trading advantages. If you prefer Fidelity's custody infrastructure or are indifferent to the liquidity difference at your expected trade size, FBTC delivers identical exposure at the same cost. Past performance of either fund does not predict future bitcoin price movements.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.
