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AI brief of an SEC Form 8-K · Ark 21Shares Bitcoin ETF (ARKB)

ARKB switches bitcoin pricing benchmark to FTSE Bitcoin Index from August 27, 2026

Neutral Impact 3 of 5 legal/regulatory Written later

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.

Key points

  • 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 filing

CompanyArk 21Shares Bitcoin ETF (ARKB)
Form8-K, current report
Filed with the SECAug 26, 2026, 4:11 PM ET
Accession number0001213900-26-093966

Items reported: 1.01 Material Definitive Agreement5.03 Bylaw / Charter Amendment

Read the filing on SEC.gov ↗

Written by AI on Nov 9, 2026, 11:44 AM ET, from this filing only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on August 26, 2026.

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.