Company: BTC
Filing Date: 2025-04-01
Form Type: POS AM
Source: 0001193125-25-070549
Chunk: 2

Company: Grayscale Bitcoin Mini Trust ETF
Filing Date: 2025-04-01
Form: POS AM
Chunk 2
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actively adjusted to reflect the effects of the Reverse Share Split, as applicable.

No additional
securities are being registered under this Post-Effective Amendment No. 1.

The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and we are not soliciting offers to buy these securities in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED APRIL 1, 2025

PRELIMINARY PROSPECTUS

### GRAYSCALEBITCOINMINITRUSTETF
Grayscale Bitcoin Mini Trust ETF (the “Trust”) (formerly Grayscale Bitcoin Mini Trust (BTC)) is a Delaware statutory trust that issues common units of
fractional undivided beneficial interest (“Shares”), which represent ownership in the Trust. The Trust’s purpose is to hold Bitcoin, which are digital assets that are created and transmitted through the operations of the peer-to-peer Bitcoin Network, a decentralized network of computers that operates on cryptographic protocols. The Trust’s investment objective is for the value of the
Shares (based on Bitcoin per Share) to reflect the value of Bitcoin held by the Trust, as determined by reference to the Index Price (as defined herein), less the Trust’s expenses and other liabilities. While an investment in the Shares is not
a direct investment in Bitcoin, the Shares are designed to provide investors with a cost-effective and convenient way to gain investment exposure to Bitcoin. Grayscale Investments Sponsors, LLC is the sponsor of the Trust (the “Sponsor”),
CSC Delaware Trust Company is the trustee of the Trust (the “Trustee”), The Bank of New York Mellon is the transfer agent of the Trust (in such capacity, the “Transfer Agent”) and the administrator of the Trust (in such capacity,
the “Administrator”), Coinbase, Inc. is the prime broker of the Trust (the “Prime Broker”) and Coinbase Custody Trust Company, LLC is the custodian of the Trust (the “Custodian”).

The Shares are listed on NYSE Arca, Inc. (“NYSE Arca”) under the symbol “BTC.” The Trust intends to issue Shares on a continuous basis and
is registering an indeterminate number of Shares. It is expected that the Shares will be sold to the public at varying prices to be determined by reference to, among other considerations, the price of Bitcoin and the trading