IBIT In-Kind Redemptions vs. FBTC Cash Creations: The Structural Edge

On May 27, 2026, a single dark-pool block sale moved $1.29 billion worth of BlackRock’s iShares Bitcoin Trust (IBIT) shares in one transaction. That trade involved roughly 29 million shares at approximately $43.16 each, landing right as Bitcoin faced downward pressure. While this specific event occurred in the secondary market, it underscores the operational reality that authorized participants must buy or sell spot Bitcoin to create or redeem ETF shares. The structural difference between how BlackRock and Fidelity handle these primary market transactions now determines which fund creates less friction for the broader market. I find that IBIT’s shift to in-kind redemptions gives it a clear operational advantage over Fidelity’s cash-only creation process, particularly during periods of high volatility where liquidity is thin.

The Mechanics of Creation and Redemption

BlackRock’s IBIT operates under a new regime established by SEC orders issued on July 29, 2025, permitting both in-kind creations and redemptions. The Q2 2026 10-Q filing confirms this mechanism is fully active, with $3.29 billion of Bitcoin purchased in-kind for share issuance and $3.85 billion paid in-kind for share redemptions during that quarter alone. This means when investors redeem IBIT shares, BlackRock does not need to sell Bitcoin on the open market; instead, it returns the underlying digital assets directly to the authorized participant. This bypasses the "sell-to-cash" step that typically injects selling pressure into the spot market.

Fidelity’s Wise Origin Bitcoin Fund (FBTC) follows a different path. Its creation process relies on cash contributions from authorized participants, who then purchase Bitcoin separately to deposit into the trust. This structure forces a direct interaction with the spot market whenever new shares are created. If an authorized participant wants to issue more FBTC shares, they must first acquire Bitcoin through standard market channels, adding to demand. Conversely, while redemption mechanics vary, the lack of a disclosed in-kind redemption facility for FBTC suggests that large-scale exits may still require liquidating holdings or using cash buffers, potentially creating localized price impacts. For a fund holding $15.3 billion in assets as of September 24, 2026, this distinction matters when flows spike.

Market Impact and Liquidity Depth

The size gap between the two funds amplifies the importance of their respective mechanisms. IBIT holds roughly 4.4 times the assets of FBTC and trades about ten times the dollar volume, with an average daily volume of 37.9 million shares compared to FBTC’s 2.4 million. When IBIT processes a large redemption via in-kind transfer, the Bitcoin moves from the trust to the custodian without hitting the public order book. This preserves the tight bid-ask spreads that keep IBIT’s median spread at just 0.02%. In contrast, if FBTC were forced to liquidate Bitcoin to cover redemptions, those sales would appear as standard sell orders, potentially widening spreads during stress events.

I see this as a critical risk mitigation tool. During the period ending May 18, 2026, US spot Bitcoin ETFs saw $648.64 million in net outflows, with IBIT accounting for $448.36 million of that total. Had all those redemptions required immediate spot sales, the price impact would have been severe. Because IBIT can settle in-kind, the market absorbed the flow without a corresponding dump of coins. This efficiency is why institutional allocators favor IBIT for large positions; the deepest order book combined with in-kind settlement minimizes execution costs. FBTC remains a solid option for retail investors who prioritize custody diversification, but its smaller size and cash-based creation make it less resilient to sudden, massive flow reversals.

Custody and Strategic Trade-offs

The choice between these two funds often comes down to custody preference rather than pure performance metrics. Both charge an identical 0.25% expense ratio, so fees do not differentiate them. However, IBIT stores its Bitcoin with Coinbase Custody Trust and Anchorage Digital Bank, whereas FBTC keeps its assets entirely within Fidelity Digital Assets, N.A. This makes FBTC the only mainstream fund with no exposure to Coinbase, a significant consideration for investors concerned about counterparty concentration. Since four major funds, including IBIT, GBTC, and the Grayscale Mini Trust, use Coinbase, nearly 80% of the category’s assets sit with that single custodian.

Despite this, I would still pick IBIT for most portfolios due to its superior liquidity and efficient redemption process. The ability to settle in-kind is a structural edge that reduces systemic risk to the Bitcoin price itself. FBTC’s self-custody model is appealing for risk management, but it does not compensate for the higher friction in its creation and redemption cycle. Investors should ask themselves whether avoiding Coinbase is worth accepting a fund that cannot efficiently absorb large redemptions without market impact. That question has no universal answer, but for anyone trading in sizes larger than $100,000, the in-kind mechanism is the deciding factor.