FBTC vs ARKB: custody diversification vs. active-management pedigree
FBTC stands out as the one major spot bitcoin ETF not custodied at Coinbase — Fidelity holds the coins itself. ARKB pairs ARK Invest's brand recognition with 21Shares' operational infrastructure, at a slightly lower fee.
FBTC9.0
CUSTODY DIVERSIFICATION
0.25% expense ratio, Fidelity Digital Assets custody — not routed through Coinbase.
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ARKB8.6
FEE SAVINGS COMPOUND
0.21% expense ratio, ARK Invest and 21Shares co-managed, CBOE BZX-listed.
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Side by side
Verified JUL 2026. BTC {{ price }}
OUR VERDICT
Pick FBTC if custody concentration at Coinbase concerns you — Fidelity is the standout alternative among major issuers. Pick ARKB for a slightly lower fee and ARK Invest's brand, accepting the same Coinbase custody arrangement most competitors use.
Common questions
Why does custody concentration at Coinbase matter?
Most spot bitcoin ETFs, including IBIT, ARKB, and BITB, custody their bitcoin through Coinbase — meaning a large share of ETF-held BTC sits with one custodian. FBTC is the notable exception among major funds.
Is ARK Invest's involvement a meaningful difference?
Mostly a branding and marketing distinction — 21Shares runs the actual ETF operations and custody arrangements, similar to how other issuers structure their funds.