Company: BTC
Filing Date: 2025-04-01
Form Type: POS AM
Source: 0001193125-25-070549
Chunk: 223

Company: Grayscale Bitcoin Mini Trust ETF
Filing Date: 2025-04-01
Form: POS AM
Chunk 223
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 offering. Pursuant to a Marketing Agent Agreement (the “Marketing Agent Agreement”) between the Sponsor and Foreside Fund Services, LLC, as Marketing Agent (the “Marketing Agent”), the Marketing Agent will be paid by the Sponsor an annual fee. In addition, the Sponsor will pay certain out-of-pocketfees and expenses of the Marketing Agent incurred in connection with its assistance in the marketing of the Trust and its Shares. Under the Marketing Agent Agreement, the Marketing Agent will provide the following services to the Sponsor:

| • |     | Assist the Sponsor in facilitating Participation Agreements between and among Authorized Participants, the Trust, 
 the Transfer Agent;                                                                                               |

| • |     | Provide prospectuses to Authorized Participants; |

| • |     | Work with the Transfer Agent to review and approve orders placed by the Authorized Participants and transmitted 
 to the Transfer Agent;                                                                                          |

| • |     | Review and file applicable marketing materials with FINRA; and |

| • |     | Maintain, reproduce and store applicable books and records related to the services provided under the Marketing 
 Agent Agreement.                                                                                                |

The Shares are listed on NYSE Arca under the symbol “BTC.” 139

LEGAL MATTERS

The validity of the Shares has been passed upon by Richards, Layton & Finger, P.A., as special Delaware counsel to the Trust. Davis
Polk & Wardwell LLP, as special tax counsel to the Trust, has rendered an opinion regarding the material U.S. federal income tax consequences of the ownership of Shares.

EXPERTS

The financial statements of the Trust as of and for the period ended December 31, 2024, have been included herein and in the registration
statement in reliance upon the report of KPMG LLP, independent registered public accounting firm, appearing elsewhere herein, and upon the authority of said firm as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE

We have filed with the SEC a registration statement on Form S-1 under the Securities Act with respect
to the Shares offered hereby. This prospectus does not contain all of the information set forth in the registration statement and the exhibits and schedules thereto. For further information with respect to the Trust and its Shares, reference is made
to the registration statement and the exhibits and any schedules filed therewith. Statements contained in this prospectus as to the contents of any contract or other document referred to are not necessarily complete and, in each instance, if such
contract or document is filed as