Company: BTC
Filing Date: 2025-04-01
Form Type: POS AM
Source: 0001193125-25-070549
Chunk: 140

Company: Grayscale Bitcoin Mini Trust ETF
Filing Date: 2025-04-01
Form: POS AM
Chunk 140
---
 determines in good faith that such Index Price does not reflect an accurate price for Bitcoin, then the Sponsor will, on a best efforts basis, contact the Index Provider to obtain the Index Price directly from the Index Provider. If after such contact such Index Price remains unavailable or the Sponsor continues to believe in good faith that such Index Price does not reflect an accurate price for Bitcoin, then the Sponsor will employ a cascading set of rules to determine the Index Price, as described below in “—Determination of the Index Price When Index Price is Unavailable.” The Trust values its Bitcoin for operational purposes by reference to the Index Price. The Index Price is the value of a Bitcoin as represented by the Index, calculated at 4:00 p.m., New York time, on each business day. Illustrative Example For the purposes of illustration, outlined below are examples of how the attributes that impact weighting and adjustments in the aforementioned methodology may be utilized to generate the Index Price for a digital asset. For example, Constituent Trading Platforms used to calculate the Index Price of the digital asset may include trading platforms such as Coinbase, Kraken, LMAX Digital and Bitstamp.

| • |     | Volume Weighting: Each Constituent Trading Platform will be weighted to appropriately reflect the trading volume                                                                                                                                         
 share of the Constituent Trading Platform relative to all the Constituent Trading Platforms during this same period. For example, for each calculation of the Index Price, the initial weight of each Constituent Trading Platform used to calculate the 
 Index Price will be based on its share of the volume over the past 24-hour period as a percentage of the aggregate 24-hour volume for all Constituent Trading Platforms.                                                                                 
 The initial weight may be adjusted based on inactivity and price variance as described below.                                                                                                                                                            |

| • |     | Inactivity Adjustment: Assume that a Constituent Trading Platform represented a 14% weighting on the Index Price                                                                                           
 of the digital asset, which is based on the per-second calculations of its trading volume and price-variance relative to the cohort of Constituent Trading Platforms included in such Index, and then went 
 offline for approximately two hours. The index algorithm would automatically recognize inactivity and start de-weighting the Constituent Trading Platform after a specified period and continue            |

86

| to do so until its influence was effectively zero. As soon as trading activity resumed at the Constituent Trading Platform, the index algorithm would 
 re-weight it to the appropriate weighting factoring in the period of inactivity.                                                                      |

| • |     |