IBIT vs. FBTC: Which Spot Bitcoin ETF Should Actually Hold Your Coins?

Quick Read

• IBIT and FBTC charge identical 0.25% fees and returned nearly the same -27% year to date, making custody and liquidity the only real differentiators.

• FBTC holds bitcoin in-house through Fidelity Digital Assets, while IBIT investors carry indirect counterparty exposure to Coinbase as third-party custodian.

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Spot bitcoin ETFs settled into a two-horse race almost immediately after the January 2024 SEC approval, and the top two contenders are iShares Bitcoin Trust ETF (NASDAQ:IBIT) and Fidelity Wise Origin Bitcoin Fund (NYSEARCA:FBTC). Both hold actual bitcoin, both charge 0.25%, and both have tracked the coin to within a rounding error since launch. The choice comes down to custody, liquidity, options depth, and which brokerage ecosystem the investor already lives in.

What each fund is actually betting on

IBIT and FBTC make the same directional bet on bitcoin, but their plumbing is different. IBIT uses Coinbase Custody for its coins, outsourcing cold storage to the largest US crypto exchange. FBTC holds its bitcoin in-house through Fidelity Digital Assets, the brokerage’s institutional custody arm launched in 2018.

That distinction matters to investors who consider counterparty risk. IBIT shareholders carry indirect exposure to Coinbase as a going concern. FBTC keeps custody, brokerage, and asset management under one roof, which Fidelity presents as a vertically integrated model, a setup that shapes how investors weigh custody structure against counterparty exposure.

Where liquidity changes the math

IBIT is the largest spot bitcoin ETF by assets and by daily trading volume, and the gap is not small. This scale translates into tighter bid-ask spreads, deeper options chains, and lower implementation costs for traders rolling positions or writing covered calls. Market makers quote IBIT more aggressively because they can hedge faster in its options market.

FBTC trades plenty for a long-only holder, but its options open interest sits well behind IBIT’s. Investors who want to wrap a bitcoin position in collars, calendar spreads, or yield-enhancement strategies will find more strikes and tighter spreads on IBIT.

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Performance has been a tie

The two funds have moved almost in lockstep. Over the past year, IBIT returned ‑41.72%, and FBTC returned ‑41.73%, matching bitcoin’s ‑37% slide. Year to date, IBIT is down 27.41%, FBTC is down 27.39%, and bitcoin is off 23.99%. The small drag in both comes from fees and cash balances, not strategy, a reminder of how closely spot ETFs track their underlying asset and how little room there is for performance dispersion.

Side by side

The verdict

For most investors, the choice follows platform habits. Active traders, options users, and institutions running basis trades tend to gravitate to IBIT because spreads and options depth cut transaction costs. Long-only buy-and-hold investors already with Fidelity get a simpler experience with FBTC, with custody and brokerage in one place and no need to reconcile with a third-party custodian.

What would change the calculus is fees. The issuer fee war has already moved expense ratios more than once since launch, and a unilateral cut by either side would reopen the comparison. Until that happens, IBIT wins on liquidity and FBTC wins on integrated custody, and the rest comes down to preference, especially for anyone weighing execution quality against custody structure.

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