Every material Form 8-K Ark 21Shares Bitcoin ETF has filed with the SEC since July 07, 2026, read and summarized by AI: what happened, the key figures, whether it reads positive or negative for shareholders, and how big a deal it is (impact 1-5). Newest first; each brief links to its own page and to the filing on SEC.gov.
Sponsor 21Shares US LLC gave notice on October 16, 2026 to terminate its marketing and sub-advisory agreement with ARK Investment Management, effective December 22, 2026. The Trust plans to rename itself 21Shares Bitcoin ETF and change its Cboe BZX ticker from ARKB to TBIT on December 15, 2026.
Notice of termination given to ARK Investment Management on October 16, 2026
Termination effective December 22, 2026
On December 15, 2026, the Sponsor intends to rename the Trust to 21Shares Bitcoin ETF
ARK 21Shares Bitcoin ETF will value its shares and calculate net asset value using the FTSE Bitcoin Index instead of the CME CF Bitcoin Reference Rate - New York Variant, starting August 27, 2026, after the prior licensing agreement with CF Benchmarks is set to end August 31, 2026. The sponsor also changed the timing of its fee payments from weekly to at least quarterly, with the fee still paid in bitcoin, and the filing says the revisions to the trust agreement do not materially affect the rights of the trust or shareholders.
Benchmark switch: from August 27, 2026, the trust uses the FTSE Bitcoin Index in place of the CME CF Bitcoin Reference Rate - New York Variant for net asset value.
Licensing: the Benchmark Licensing Agreement with FTSE International Limited is dated August 20, 2026, with an expected one-year initial term that renews automatically.
Sponsor fee: Amendment No. 1, dated August 26, 2026, moves Sponsor Fee payments from weekly to at least quarterly in arrears, payable in bitcoin.
Documents: the trust agreement was restated on August 26, 2026 with the sponsor and CSC Delaware Trust Company as trustee.
The sponsor of the ARK 21Shares Bitcoin ETF gave notice on June 30, 2026 that it will terminate its licensing agreement with CF Benchmarks, effective August 31, 2026. The fund uses the CME CF Bitcoin Reference Rate to value its shares daily and calculate net asset value, so it plans to replace it with FTSE index data under a new license expected around August 24, 2026.
Termination notice given to CF Benchmarks on June 30, 2026, effective August 31, 2026
Pricing benchmark being replaced is the CME CF Bitcoin Reference Rate—New York Variant
Sponsor intends to sign a new license with FTSE International Limited on or about August 24, 2026
Filing says the switch is part of a broader transition to a new benchmark provider; no financial impact figures are given
Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.
Only material 8-Ks get a brief: results, deals, executive changes, restructuring, impairments, delisting notices, restatements, cybersecurity incidents and other disclosed events. Routine filings (vote results, exhibits only) are skipped. Every Ark 21Shares Bitcoin ETF filing is on SEC EDGAR ↗. 8-K briefs of other companies →