BlackRock’s iShares Bitcoin Managed Protection ETF Would Trade Bitcoin’s Upside for a 10% Floor: Who Is It Built For?
BlackRock’s proposed iShares Bitcoin Managed Protection ETF, filed with the SEC on October 19 under the ticker PBIT, would give investors BTC exposure with roughly the first 10% of losses absorbed, in exchange for a cap on gains. It is aimed at advisers and cautious investors who want Bitcoin in a portfolio but not its full swings. The fund isn’t trading yet, and the fee is still blank.
The timing is pointed. The Bitcoin price sits near $81,700, about 35% below its October 2025 record, after falling as low as $57,800 in July.
So what exactly would PBIT hold, and what does the protection cost?
What Is the iShares Bitcoin Managed Protection ETF?
It is an options fund built on top of IBIT, BlackRock’s spot Bitcoin ETF. The preliminary prospectus says the fund will not hold Bitcoin or Bitcoin ETFs directly. It buys call options on IBIT and similar products, sells higher-strike calls to help pay for them, and keeps the rest in cash and short-term bonds that earn interest.
The positions are split into three overlapping tranches with start dates one month apart, so one tranche ends and a new one begins every month. Each starts with its bought calls near 90% of IBIT’s value. That sets a maximum loss of about 10% per tranche before fees. The sold calls set a cap on gains, which will change with market conditions when each tranche starts.
The prospectus is direct about the limits. The protection is not guaranteed, investors “may lose some or all of their money,” and someone buying mid-tranche may get a very different buffer than 10%. If BTC rises after a tranche starts, the distance to the floor grows.
What Is the Purpose of a Protected Bitcoin ETF?
To make Bitcoin easier to hold for people who can’t stomach it. BTC has dropped more than 50% from its peak twice in five years, and that volatility keeps it out of many retirement and adviser-managed accounts.
There is also a structural reason. PBIT is filed under the Investment Company Act of 1940, the same rules that govern mutual funds and most ETFs. IBIT is a grantor trust that holds Bitcoin and sits outside that framework. Some brokerage platforms and model portfolios only allow 1940 Act funds, so a wrapper like PBIT could bring BlackRock’s Bitcoin product to shelves IBIT can’t reach.
Discover: Large-Fund Redemptions Expose a Split in Bitcoin ETF Flows
How Have Other Protected Bitcoin ETFs Performed?
BlackRock isn’t first. Calamos, Innovator and FT Vest already run Bitcoin funds with floors, and the Calamos laddered funds use the same monthly-ladder idea as PBIT. This year’s Bitcoin drawdown has been their first real test.
| Fund | Protection | 2026 return* |
|---|---|---|
| Calamos CBOL | 100% | 0.0% |
| Calamos CBXL | 90% | −5.2% |
| Calamos CBTL | 80% | −7.7% |
| Innovator QBF | 20% floor, uncapped | −16.0% |
| iShares Bitcoin Trust (IBIT) | None | −9.6% |
Price change from the first 2026 close to October 22. Source: Yahoo Finance
The capped funds did what they promised. Investors in the 100% fund are flat on a year when BTC is down. The uncapped 20% floor fund did worse than IBIT itself. The cost of protection shows up in the return even when the floor is never reached.
That cost is the question for PBIT. Calamos charges 0.79% a year for its 100% and 90% laddered funds, more than three times IBIT’s 0.25% fee.
When Could PBIT Launch?
Not before 2027. New funds filed this way usually become effective 75 days after filing, which points to early January at the earliest. BlackRock still has to fill in the fee and the first tranche’s cap.
Demand for plain BTC is still strong. IBIT holds about $65 billion and led about $1 billion of spot Bitcoin ETF inflows earlier this week. PBIT is BlackRock’s bet that a second group of investors exists: people who want Bitcoin but would rather give up part of a rally than ride out a 50% drop.
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