BlackRock files PBIT, a bitcoin ETF with a buffer and a cap
BlackRock's proposed iShares Bitcoin Managed Protection ETF (PBIT) would use IBIT options to cushion losses and cap gains. How it compares with holding IBIT.
CryptoGroup Newsroom · · 4 min read
Quick verdictPBIT would swap part of bitcoin's upside for a partial cushion against falls; IBIT gives full exposure both ways. The cushion is not a guarantee, and fees are still unknown.
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BlackRock has filed with the US Securities and Exchange Commission for the iShares Bitcoin Managed Protection ETF, ticker PBIT, a fund that would give investors exposure to its spot bitcoin ETF up to a cap while trying to limit losses. The Monday, Oct. 19 filing was reported by The Block, which called it the "Managed Protect" ETF; the draft prospectus uses the name "Managed Protection".
How the strategy works
According to the prospectus, the fund would not hold bitcoin or bitcoin ETFs directly. Instead it would:
- Buy call options on IBIT and/or similar bitcoin exposure in three overlapping tranches, with staggered monthly start dates, so that each month one tranche expires and a new one begins.
- Sell higher-strike call options in each tranche to help pay for the ones it buys. That caps how much of a rally the fund can capture.
- Hold cash, money-market funds and short-term bonds, using the interest to help offset option costs and add some protection.
The purchased options are typically struck at about 90% of the reference price when a tranche starts, which sets an initial maximum loss for that tranche of roughly 10% before fees. The cap depends on market conditions at the start of each tranche and can vary. Because tranches overlap, the fund says investors should not expect a fixed floor or cap.
PBIT vs IBIT
| IBIT (trading) | PBIT (proposed) | |
|---|---|---|
| Status | Launched January 2024 | Filed Oct. 19, 2026; not approved or trading |
| What it holds | Bitcoin | Options on IBIT or similar exposure, plus cash and short-term fixed income |
| Upside | Moves with bitcoin, minus fees | Capped by the options it sells; may significantly underperform bitcoin |
| Downside | Full exposure to bitcoin's falls | Aims for about a 10% initial max loss per tranche before fees, with no guarantee |
| Fees | Published | Left blank in the draft filing |
+ Pros
- A built-in cushion for people who want bitcoin exposure but fear sharp drops
- Uses listed or FLEX options, so the investor does not have to manage options trades
- Wrapped as a regular fund under the Investment Company Act of 1940
− Cons
- Gains above the cap are given up, and the fund "may significantly underperform" its reference asset
- Protection can shrink in extreme volatility and is measured before fees
- Fees, listing exchange and launch date are not yet disclosed
Context
IBIT holds more than $65 billion in assets, the largest of its kind, according to The Block's ETF tracker. In June BlackRock launched the iShares Bitcoin Premium Income ETF, which aims to pay monthly income from option premiums. Bloomberg Intelligence's James Seyffart said on X that this is BlackRock's third bitcoin ETF filing, and that the firm still offers only bitcoin and ether products. Money is flowing back into the flagship too: IBIT took in $665.2 million on Monday, and BlackRock's crypto ETF assets jumped in the third quarter.
The cover page selects an effective date 75 days after filing, which would be around Jan. 2, 2027, but that is a filing mechanic, not a launch date.
Our verdict
A seatbelt with a speed limit, if it launches
PBIT is built for investors who would rather give up some of bitcoin's best days to soften its worst ones. IBIT remains the simpler, full-exposure option. Until fees and the first caps are published, the real trade-off cannot be judged. For the basics of fund vs coin ownership, see our guide to bitcoin ETFs vs buying bitcoin.
This article is for information only and is not financial advice. Crypto assets are volatile; do your own research. Read our disclaimer
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