Welcome to our dedicated page for Ark 21Shares Bitcoin ETF SEC filings (Ticker: ARKB), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
ARK 21Shares Bitcoin ETF filings document the Trust's bitcoin custody arrangements, material service agreements, listed share structure, and exchange registration details. The 8-K record identifies ARKB common shares of beneficial interest on Cboe BZX and discloses a custodial services agreement with BitGo Trust Company for segregated custody accounts used to receive, safeguard, and maintain the Trust's bitcoin holdings.
Ark 21Shares Bitcoin ETF (ARKB) is updating its prospectus to reflect two main changes. First, effective August 27, 2026, the Trust switched its pricing benchmark from the CME CF Bitcoin Reference Rate – New York Variant to the FTSE Bitcoin Index, now used to value bitcoin holdings and calculate NAV and NAV per Share.
The FTSE Bitcoin Index is calculated by FTSE International Limited as a 15‑second volume‑weighted average price over a 60‑minute window ending at 4:00 p.m. ET, using executed trades from specified “Constituent Exchanges” and applying exchange‑ and trade‑level outlier filters. As of July 31, 2026, Kraken, Bitstamp, Bitfinex, LMAX, Gemini, bitFlyer, itBit and Luno were included, with Kraken representing 43.470% of observed trading volume. The supplement highlights risks that methodological and venue differences versus the prior index may cause NAV to diverge from what it would have been under the old benchmark.
Second, the Trust clarifies that the 0.21% annualized Sponsor Fee continues to accrue daily based on NAV but is now payable in bitcoin at least quarterly in arrears, instead of weekly. The Sponsor remains responsible for most operating expenses out of this fee. Historical price tables based on the new index are provided, and the Sponsor states it has not observed a material difference between prices from the prior index and the FTSE Bitcoin Index over the periods shown.
Ark 21Shares Bitcoin ETF (ARKB) reports several contractual and structural updates. On August 20, 2026, 21Shares US LLC, as Sponsor, entered into a Benchmark Licensing Agreement with FTSE International Limited, giving a non-exclusive worldwide license to use the FTSE Bitcoin Index as the fund’s pricing benchmark.
Beginning August 27, 2026, the Trust will value its Shares and calculate net asset value by reference to the FTSE Bitcoin Index instead of the CME CF Bitcoin Reference Rate – New York Variant. The FTSE license has an initial term of one year and automatically renews for successive one-year periods unless terminated under its terms. On August 26, 2026, the Trust also amended the Sponsor Agreement to change Sponsor Fee payments from weekly in arrears to at least quarterly in arrears, payable in bitcoin. The same day, the Sponsor and CSC Delaware Trust Company entered into a Second Amended and Restated Trust Agreement to reflect the new benchmark, the revised Sponsor Fee timing, and other technical and clarifying revisions, which are stated not to materially impact the rights of the Trust or its shareholders.
ARK 21Shares Bitcoin ETF reports a substantial contraction in size and performance for the period ended June 30, 2026. Net assets fell from $3.31 billion at December 31, 2025 to $1.89 billion, a 42.84% decrease, primarily due to bitcoin’s price declining 32.91% from $87,515.28 to $58,714.04 and net share redemptions.
The Trust held 32,178.2280 bitcoin worth $1.89 billion in its principal market at quarter-end, with 97,015,000 Shares outstanding and NAV per Share of $19.47. Six‑month total return at NAV was (33.00)%, and the Sponsor Fee remained a low 0.21% of NAV, totaling about $2.76 million year‑to‑date.
The Sponsor notified CF Benchmarks that the CME CF Bitcoin Reference Rate licensing will terminate effective August 31, 2026, and intends to license FTSE index data beginning around August 24, 2026. Management reports effective disclosure controls, no material legal proceedings, and no material changes in risk factors versus the prior annual and first‑quarter reports.
ARK 21Shares Bitcoin ETF reported that its sponsor, 21Shares US LLC, has elected to terminate its licensing agreement with CF Benchmarks for use of the CME CF Bitcoin Reference Rate—New York Variant. The termination is effective August 31, 2026.
The sponsor intends to enter a new licensing agreement with FTSE International Limited on or about August 24, 2026, under which FTSE will provide index data used to support and value the Trust. Both the existing CF Benchmarks license and the planned FTSE license are non-exclusive, non-transferable, perpetual arrangements that renew annually unless terminated.
ARK 21Shares Bitcoin ETF reported a sharp decline in value for the quarter ended March 31, 2026, as bitcoin prices fell. Net assets dropped from $3.31 billion to $2.39 billion, a 27.73% decrease, while the bitcoin price used for GAAP NAV fell about 22.56% over the period.
The Trust held 35,246.5837 bitcoins at quarter‑end, all classified as Level 1 fair value. Net decrease in net assets from operations was $(716.8) million, driven mainly by unrealized depreciation of bitcoin and realized losses on coins sold for redemptions and fees. The ETF delivered a Q1 total return of -22.61% at NAV, consistent with its passive objective to track bitcoin minus a 0.21% annual Sponsor Fee.
ARK 21Shares Bitcoin ETF files its annual report describing how the trust tracks the price of bitcoin and outlining key operational and risk details. The ETF holds bitcoin in custody with multiple regulated custodians, values its shares daily using the CME CF Bitcoin Reference Rate – New York Variant, and issues and redeems shares in 5,000‑share baskets through authorized participants.
The trust charges a unitary 0.21% Sponsor Fee, largely paid in bitcoin, which covers most operating expenses; this fee was fully waived until trust assets first exceeded $1 billion in February 2024. As of June 30, 2025, shares held by non‑affiliates were valued at $5.03 billion, and there were 107,550,000 shares outstanding as of February 26, 2026.
The filing emphasizes that the ETF is a passive grantor trust concentrated solely in bitcoin, not registered under the Investment Company Act or regulated as a commodity pool. It details extensive cybersecurity, custody, and prime brokerage arrangements, while highlighting significant risks from bitcoin price volatility, exchange failures, market manipulation, regulatory changes, tax treatment uncertainties, and limited investor rights, including minimal voting powers and broad indemnification protections for the sponsor and service providers.
ARK 21Shares Bitcoin ETF reported two key operational updates affecting how it holds bitcoin and processes share creations and redemptions. On December 12, 2025, the fund entered into a new Custodial Services Agreement with BitGo Trust Company, Inc., under which BitGo will maintain segregated custody accounts for the ETF’s bitcoin, keep reasonable insurance coverage, and provide safekeeping services. The ETF must indemnify BitGo and certain affiliates in specified circumstances.
The sponsor will continue to use existing custodians Coinbase Custody Trust Company, LLC, Anchorage Digital Bank N.A., and BitGo New York Trust Company, LLC, and will allocate bitcoin among them and BitGo Trust Company based on risk, cost, and other factors. On December 16, 2025, the ETF also entered into an Authorized Participant Agreement with Macquarie Capital (USA) Inc., allowing Macquarie to create and redeem 5,000-share baskets, including in-kind orders using bitcoin, with transaction fees generally charged by the sponsor.
ARK 21Shares Bitcoin ETF (ARKB) reported Q3 results anchored by bitcoin price movement and share activity. Net assets were $5,092,934 thousand at September 30, 2025, with NAV per share of $38.00. The Trust held 44,528.1082 bitcoins, valued at $5,093,058 thousand using its principal market price.
For the quarter, the Trust recorded a net increase in net assets from operations of $317,667 thousand, driven by net realized and unrealized gains of $320,440 thousand and sponsor fees of $2,773 thousand. For the nine months ended September 30, 2025, the Trust posted a net increase from operations of $927,779 thousand and total return at NAV of 22.30%. Shares outstanding were 134,040,000 at September 30, 2025; the Trust executed a 3‑for‑1 share split effective June 16, 2025. The Sponsor fee remained 0.21% annually, with $7,584 thousand incurred for the nine-month period.