Financial Highlights - Schedule of Financial Highlights Per Share Performance (Details) - $ / shares

3 Months Ended

9 Months Ended

Sep. 30, 2025

Sep. 30, 2024

Sep. 30, 2025

Sep. 30, 2024

Financial Highlights [Abstract]

Net asset value per Share, beginning of period

$ 35.81

$ 20.63

^[1]

$ 31.07

^[1],[2]

$ 16.67

^[1]

Total return, at net asset value

^[3],[4]

6.12%

2.42%

22.30%

26.76%

Ratio to average net assets(4)

Net investment income (loss)

^[5]

(0.21%)

Gross expenses

^[5]

0.21%

Net expenses

^[5]

0.21%

Net investment income (loss) on investment in bitcoin

^[6]

$ (0.02)

$ (0.01)

$ (0.09)

$ (0.03)

Net realized and change in unrealized gain(loss) on investment in bitcoin

^[7]

2.21

0.51

7.02

4.49

Net change in net assets from operations

2.19

0.5

6.93

4.46

Net asset value per Share, end of period

$ 38

$ 21.13

^[1],[6]

$ 38

$ 21.13

^[1],[6]

[1]	On June 13, 2025, the Share Split occurred. Historical shares outstanding and NAV per share have been adjusted to reflect the Share Split on a retroactive basis.
[2]	On June 13, 2025 there was a 3-for-1 share split. Historical shares outstanding and net asset value per share have been adjusted to reflect the 3-for-1 share split on a retroactive basis.
[3]	Not Annualized.
[4]	Total return is calculated based on the change in value during the period and is not annualized. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from the Trust.
[5]	Annualized.
[6]	Calculated using average Shares outstanding.
[7]	The amount shown for a share outstanding throughout the period may not agree with the change in the aggregate gains and losses for such period because of the timing of sales and repurchases of the Trust’s shares in relation to fluctuating market values for the Trust.

Ark 21Shares Bitcoin ETF 10-Q