Company: BTC
Filing Date: 2025-01-03
Form Type: 424B3
Source: 0001193125-25-001519
Chunk: 0

Company: Grayscale Bitcoin Mini Trust ETF
Filing Date: 2025-01-03
Form: 424B3
Chunk 0
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Filed Pursuant to Rule 424(b)(3)

Registration No. 333-277837

Grayscale Bitcoin Mini Trust ETF

Supplement No. 3 Dated January 3, 2025

To the Prospectus Dated July 30, 2024

This
prospectus supplement (this “Supplement”) is part of and should be read in conjunction with the prospectus of Grayscale Bitcoin Mini Trust ETF (the “Trust”), dated July 30, 2024 (as supplemented from time to time, the
“Prospectus”). Unless otherwise defined herein, capitalized terms used in this Supplement shall have the same meanings as in the Prospectus.

The purpose of this Supplement is to disclose (i) the consummation of an internal corporate reorganization by the sponsor of the Trust, (ii) the
assignment of certain contracts by the sponsor of the Trust and (iii) the admission of an additional sponsor of the Trust.

Corporate Reorganization of the Sponsor

On January 1, 2025, Grayscale Investments, LLC (“GSI”) consummated an internal corporate reorganization
(the “Reorganization”), pursuant to which GSI, the sponsor of the Trust prior to the Reorganization, merged with and into Grayscale Operating, LLC, a Delaware limited liability company and a wholly owned indirect subsidiary of Digital
Currency Group, Inc. (“GSO”), with GSO continuing as the surviving company (the “Merger”).

As a result of the Merger, GSO succeeded
by operation of law to all the rights, powers, privileges and franchises and became subject to all of the obligations, liabilities, restrictions and disabilities of GSI, including with respect to the Sponsor Contracts (as defined below), all as
provided under the Delaware Limited Liability Company Act.

We do not expect the Reorganization to have any material impact on the operations of the
Trust.

Assignment Agreements

In connection with the
Reorganization, on January 1, 2025, and promptly following the effectiveness of the Merger, GSO assigned certain contracts pertaining to its role as Sponsor (as such term is defined in the Trust Agreement) of the Trust (such contracts, the
“Sponsor Contracts”) to Grayscale Investments Sponsors, LLC, a Delaware limited liability company and a wholly owned direct subsidiary of GSO (“GSIS” or the “Additional Sponsor”), pursuant to an: (1) Assignment and
Assumption Agreement, dated as of January 1, 2025