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The ticker changed from ARKB to TBIT. The index used to calculate NAV had already changed in August.

On October 22, the ARK 21Shares Bitcoin ETF filed an 8-K with the SEC. The filing says that sponsor 21Shares US LLC notified ARK Investment Management on October 16 that it was terminating their marketing and sub-advisory agreement, effective December 22, 2026. The same filing included another change: on December 15, the fund will be renamed the 21Shares Bitcoin ETF, and its ticker on Cboe BZX will change from ARKB to TBIT.

Cathie Wood’s ARK is disappearing from the ticker. The news spread quickly. But the part of this ETF that was actually changed this year was changed in August. It had nothing to do with the name.

The chart shows two tracks, and every date comes from SEC filings—nothing is estimated. The top track shows how the fund calculates NAV; the bottom shows what it’s called. The top track starts on June 30, when 21Shares notified CF Benchmarks that it was terminating its pricing benchmark license, which was set to expire on August 31. In between, on August 20, it signed a new benchmark license with London-based FTSE. Starting August 27, the fund began using the FTSE Bitcoin Index to value its assets and calculate NAV, replacing the CME CF Bitcoin Reference Rate - New York Variant. This track took 62 days to complete.

The bottom track began on October 16 and ends on December 22: 67 days. By the end, the name and ticker will have changed. That’s all.

Both terminations are listed under Item 1.02, or “Termination of a Material Definitive Agreement.” The timelines are almost identical: one took 62 days, the other 67. In both cases, notice came first and took effect a little over two months later. The two changes followed the same standard process. The difference is what changed: one was the index used to price shares each day; the other was a marketing contract and three letters.

How far apart are these two changes? The fund’s 8-K filing history makes it clear. Since September 12, 2024, it has filed a total of seven 8-Ks. Three were for new material agreements under Item 1.01, and two were for terminating material agreements under Item 1.02. Five of the seven involved contract changes. The contract layer has been moving. The pricing layer hasn’t.

Three of those seven filings came in 2026. That’s a lot: three in one year. When a sponsor files three 8-Ks in a year for the same ETF, it suggests the product’s contract structure is still being adjusted and hasn’t settled. In fact, not a single filing has changed anything at the holdings level in two years. The name, on the other hand, has changed once.

Changing the pricing benchmark has a tangible impact. An ETF’s NAV is calculated by multiplying its holdings by the benchmark price. The CME CF and FTSE methodologies differ, so they can give different prices at the same moment. The filing doesn’t say how large the difference is; that has to be assessed using actual tracking-error data. Changing the name has a softer impact. That’s the distinction. The 8-K doesn’t mention any changes to the number of shares, bitcoin holdings, custody arrangements, or creation and redemption mechanism.

When many people saw the ticker change from ARKB to TBIT, their first reaction was that something was going wrong with the fund. The rumors that followed went much further than the filing. The fact is, the fund hasn’t even come close to being liquidated. The 8-K says nothing about liquidation, a merger, or a change in strategy. The only thing being terminated is a marketing and sub-advisory agreement. An ETF’s continued existence is governed by its trust agreement, not its advisory contract. These two things are often conflated.

It’s worth being clear about what the filing doesn’t say. The 8-K gives just one reason for why 21Shares is terminating its agreement with ARK: it is “exercising its termination right in accordance with the terms.” It gives no further explanation. Reading this as ARK turning bearish on bitcoin, or as 21Shares wanting to build its own brand, is speculation. There’s no basis for either in the filing. Likewise, the filing doesn’t say whether fees changed when the benchmark switched from CME CF to FTSE, or whether tracking error will widen. I can’t draw conclusions on its behalf.

One more thing: termination of an agreement does not mean termination of the fund. The 8-K treats these as separate matters. Read them as one and you could reach the exact opposite conclusion. Yet the filing about the benchmark change in July barely got any attention at the time.

December 15 is the ticker-change date. Exchange and brokerage ticker mappings should show how the change is actually implemented that day. So far, the only things we can confirm are the dates and the agreement names. After the agreement expires on December 22, whether the letters ARK still appear in the fund’s name and marketing materials will be one indicator of how complete the termination is. Later on, if 21Shares updates the prospectus, it will disclose the fee and benchmark terms together. That’s when we’ll have enough information to do the math. For everything else, we’ll have to wait for the filings. There’s no need to rush.

Sources: SEC EDGAR, CIK 0001869699. Filed 10-22: https://www.sec.gov/Archives/edgar/data/1869699/000121390026111688/ea0309236-8k_ark21shares.htm and filed 07-07: https://www.sec.gov/Archives/edgar/data/1869699/000121390026075990/ea0296648-8k_ark21share.htm

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