BlackRock's iShares Bitcoin Trust (IBIT) is drawing record interest from large holders converting directly held Bitcoin into fund shares, even as the fund records recent withdrawals. The divergence suggests major holders are changing custody arrangements rather than increasing their Bitcoin exposure.

Robbie Mitchnick, BlackRock's head of digital assets, described security as the main motivation, Barron's reported on Monday. According to the report, BlackRock has tracked approximately $3.6 billion in Bitcoin-to-IBIT conversions. That figure excludes transactions the company does not directly observe.

Record Conversions Contrast With Recent Withdrawals

The transactions allow eligible holders to contribute existing Bitcoin and receive newly created IBIT shares. An intermediary coordinates each conversion through the fund's authorized-participant system, the mechanism through which approved institutions handle share creation and redemption in bulk. Holders retain Bitcoin price exposure but no longer control the underlying coins directly.

Because the Bitcoin already exists, each transfer does not require a fresh spot-market purchase. Consequently, fund share creations alone cannot be read as equivalent new capital entering the Bitcoin market.

Farside Investors recorded $213.2 million in net IBIT outflows on November 9, a session in which redemptions exceeded creations. U.S. spot Bitcoin funds collectively lost $201 million in the same session. Those figures track net ETF creations and redemptions, not individual investors' security decisions.

Earlier Conversion Totals Require Separate Treatment

The reported dollar amounts also require careful comparison. Bloomberg reported in August that IBIT had facilitated more than $5 billion in conversions. Barron's later cited about $3.6 billion observed directly by BlackRock.

Those descriptions suggest different coverage, although neither article reconciles the totals. The newer figure therefore should not be presented as total lifetime conversion volume.

SEC Rules Enabled Bitcoin Transfers Into ETFs

On July 29, 2025, the U.S. Securities and Exchange Commission approved in-kind creations and redemptions for crypto funds, a process that lets eligible holders deliver the underlying asset instead of cash. Previously, the funds operated through cash-only creation and redemption mechanisms.

BlackRock's prospectus limits direct basket creation and redemption to authorized participants. Bloomberg reported that the minimum conversion size fell from $25 million to $1 million in July 2026. Access therefore remains concentrated among investors capable of arranging large transactions. Any further changes to those access terms would surface in prospectus filings, while daily Farside Investors reports remain the running record of fund-level flows.

Custody transfers do not eliminate investment or operational risk. BlackRock's disclosures warn that cold-storage protections cannot prevent every potential theft or technical failure. IBIT charges a 0.25% sponsor fee, an annual charge applied against fund assets, according to the issuer's fund page.

IBIT names Coinbase Custody as its primary Bitcoin custodian and lists Anchorage Digital Bank as an alternative. Ordinary shareholders cannot redeem individual shares for Bitcoin, and the trust lacks the regulatory protections provided by the Investment Company Act of 1940, the statute that governs registered investment companies such as traditional mutual funds.