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

ARKB to Switch Bitcoin Price Benchmark From CF to FTSE, Effective August 31

Neutral Impact 2 of 5 product/contract Written later

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.

Key points

  • 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

The filing

CompanyArk 21Shares Bitcoin ETF (ARKB)
Form8-K, current report
Filed with the SECJul 7, 2026, 4:32 PM ET
Accession number0001213900-26-075990

Items reported: 1.02 Termination of Material Agreement

Read the filing on SEC.gov ↗

Written by AI on Nov 9, 2026, 11:45 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 July 07, 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.