IBIT vs FBTC: Which Bitcoin ETF?

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The Short Answer

Pick IBIT if: You want the largest Bitcoin ETF by AUM (~$50B+), lowest trading spreads, and BlackRock's distribution network. IBIT is the default Bitcoin ETF for most investors.

Pick FBTC if: You want a slightly lower expense ratio (0.15% vs 0.25%) and prefer Fidelity's platform. FBTC is the second-largest Bitcoin ETF with competitive fees.

Quick comparison

Feature	IBIT	FBTC
Sponsor	BlackRock (iShares)	Fidelity
Expense Ratio	0.25%	0.15%
Custodian	Bloomberg/BitGo	Fidelity Digital Assets
AUM	~$50B+	~$15B
Liquidity	Very high (tightest spreads)	High
BTC held	Spot BTC (actual Bitcoin)	Spot BTC (actual Bitcoin)

What's the real difference?

Both funds are spot Bitcoin ETFs — they hold actual Bitcoin, not futures contracts. When you buy shares of either fund, you own a proportional share of the Bitcoin held in custody.

IBIT is BlackRock's Bitcoin ETF. It's the largest by AUM (~$50B+), has the tightest trading spreads, and benefits from BlackRock's massive distribution network. The 0.25% fee is higher than FBTC but reflects the brand premium and liquidity advantage.
FBTC is Fidelity's Bitcoin ETF. It charges 0.15% — a full 10 basis points lower than IBIT. Fidelity Digital Assets is the custodian, which means your Bitcoin is held by one of the most trusted names in custody.

Fees matter — but not as much as you think

The 0.10% fee difference between IBIT and FBTC sounds significant, but on a $10,000 investment it's only $10/year. On a $50,000 Dare allocation (extreme scenario), it's $50/year.

The real question is whether the liquidity advantage of IBIT justifies the extra cost. For most investors, yes — tighter spreads mean you pay less in bid-ask costs when trading. But if you're buying and holding (which is the point of a Dare slot), this difference is negligible.

Custody and security

Both funds use institutional-grade custody:

IBIT uses a dual-custody model with multiple custodians (Bloomberg/BitGo). BlackRock's risk management framework adds an extra layer of oversight.
FBTC uses Fidelity Digital Assets as custodian — one of the largest and most trusted crypto custody providers in the world.

Liquidity

IBIT has significantly higher trading volume and AUM, which translates to tighter bid-ask spreads. If you're actively trading Bitcoin ETFs (which you shouldn't be in a Dare slot), IBIT's liquidity advantage matters more.

Which belongs in the Five Fund Frame?

For your Dare slot — the speculative bucket capped at 10% of your portfolio — either ETF works. Here's how to choose:

Pick IBIT if you want the safest liquidity profile and don't mind paying 0.10% more in fees for BlackRock's distribution network.
Pick FBTC if you want lower fees and prefer Fidelity's platform. The 0.15% fee is genuinely competitive.

We lean toward IBIT because the liquidity advantage matters more than you'd expect in crypto markets, and BlackRock's track record with institutional products is excellent. But FBTC's lower fee is hard to ignore if you're a long-term holder who rarely trades.

Risk warning

Bitcoin is volatile. A 50% drawdown in a month isn't unusual. Your Dare slot should be sized so that losing it entirely wouldn't change your life. If the thought of seeing 10% of your portfolio disappear gives you anxiety, reduce your Dare allocation — don't hold Bitcoin at all.

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