iShares Bitcoin Trust (IBIT) FWPFree writing prospectus

The iShares Bitcoin Trust ETF (the “Trust”) has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus and other documents the Trust has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting www.iShares.com or EDGAR on the SEC website at www.sec.gov. Alternatively, the Trust will arrange to send you the prospectus if you request it by calling toll-free 1-800-474-2737.

The iShares Bitcoin Trust ETF is not an investment company registered under the Investment Company Act of 1940, and therefore is not subject to the same regulatory requirements as mutual funds or ETFs registered under the Investment Company Act of 1940. The Trust is not a commodity pool for purposes of the Commodity Exchange Act. Before making an investment decision, you should carefully consider the risk factors and other information included in the prospectus.

Investing involves a high degree of risk, including possible loss of principal. An investment in the Trust is not suitable for all investors, may be deemed speculative and is not intended as a complete investment program. An investment in Shares should be considered only by persons who can bear the risk of total loss associated with an investment in the Trust.

This material is provided for educational purposes only and is not intended to constitute investment advice or an investment recommendation within the meaning of federal, state or local law. You are solely responsible for evaluating and acting upon the education and information contained in this material. BlackRock will not be liable for direct or incidental loss resulting from applying any of the

information obtained from these materials or from any other source mentioned. BlackRock does not render any legal, tax or accounting advice and the education and information contained in this material should not be construed as such. Please consult with a qualified professional for these types of advice.

Investing in digital assets involves significant risks due to their extreme price volatility and the potential for loss, theft, or compromise of private keys. The value of the shares is closely tied to acceptance, industry developments, and governance changes, making them susceptible to market sentiment. Digital assets represent a new and rapidly evolving industry, and the value of the Shares depends on their acceptance. Changes in the governance of a digital asset network may not receive sufficient support from users and miners, which may negatively affect that digital asset network's ability to grow and respond to challenges Investing in the Trust comes with risks that could impact the Trust's share value, including large-scale sales by major investors, security threats like breaches and hacking, negative sentiment among speculators, and competition from central bank digital currencies and financial initiatives using blockchain technology. A disruption of the internet or a digital asset network would affect the ability to transfer digital assets and, consequently, would impact their value. There can be no assurance that security procedures designed to protect the Trust's assets will actually work as designed or prove to be successful in safeguarding the Trust's assets against all possible sources of theft, loss or damage.

The Trust may incur certain extraordinary, non-recurring expenses that are not assumed by the Sponsor.

Shares of the Trust are not deposits or other obligations of or guaranteed by BlackRock, Inc., and its affiliates, and are not insured by the Federal Deposit Insurance Corporation or any other governmental agency. The sponsor of the trust is iShares Delaware Trust Sponsor LLC (the “Sponsor”). BlackRock Investments, LLC ("BRIL"), assists in the promotion of the Trust. The Sponsor and BRIL are affiliates of BlackRock, Inc. The Sponsor is not responsible for losses incurred due to loss, theft, destruction, or compromise of the trust's bitcoin.

Transactions in shares of ETPs may result in brokerage commissions and will generate tax consequences.

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