BlackRock is reporting record demand from large Bitcoin holders seeking to convert their self-custodied BTC into shares of its spot Bitcoin exchange-traded fund, IBIT, with security concerns cited as the primary driver. According to Barron's, the reported conversions have reached approximately $3.6 billion, although the actual figure could be higher.

IBIT began trading in January 2024 as part of the first wave of US spot Bitcoin ETFs approved by the Securities and Exchange Commission. Robbie Mitchnick, BlackRock's Head of Digital Assets, said demand from major Bitcoin holders looking to move their holdings into the ETF has reached unprecedented levels. The development reflects a growing preference among some large investors to hold Bitcoin exposure through a regulated investment product rather than maintain direct custody of the underlying cryptocurrency.

From Self-Custody to ETF Shares

The roughly $3.6 billion in conversions involves investors exchanging Bitcoin they already own for shares of BlackRock's IBIT. These transactions can be completed through in-kind transfers, a mechanism that allows eligible investors to contribute existing BTC holdings and receive ETF shares without first selling their Bitcoin on the open market. In-kind creation and redemption is a long-standing feature of the broader ETF structure, allowing funds to adjust share supply without forcing transactions in the underlying market.

The mechanism is significant because it distinguishes custody transfers from conventional ETF purchases made with newly invested cash. Rather than necessarily representing fresh capital entering the Bitcoin market, the transactions reflect a change in how investors hold their existing exposure to the cryptocurrency.

For large Bitcoin holders, self-custody means maintaining direct control over their private keys and taking responsibility for securing their assets. Moving holdings into an ETF changes that arrangement, placing the Bitcoin within the fund's custody structure while investors hold shares representing exposure to the asset.

Security Concerns Drive Demand for IBIT Conversions

According to Wu Blockchain, whose report was cited by Barron's, security concerns are the main reason behind the record demand. Large holders seeking to convert self-custodied BTC may be looking to reduce the responsibilities and risks associated with managing cryptocurrency holdings directly.

The approximately $3.6 billion figure indicates the scale of the reported activity, but it should not automatically be interpreted as an equivalent amount of new money flowing into Bitcoin or IBIT. Because the transactions involve exchanging existing BTC for ETF shares, they can change the form and custody of an investment without requiring an outright market sale followed by a new cash purchase.

Mitchnick's comments, as reported by Barron's, point to a substantial shift among large Bitcoin investors toward ETF-based exposure. Reported conversions stand at approximately $3.6 billion, with the actual total potentially higher. Since the figures come from company commentary and third-party reporting rather than a regulatory filing, IBIT's publicly reported flow data offers a channel through which the scale of such conversions can be tracked over time.