BlackRock files for a bitcoin ETF with loss protection and capped gains

BlackRock filed the papers with the SEC on 19 October. It is a preliminary prospectus: it says plainly that the information is incomplete and may change, and that shares cannot be sold until the registration takes effect.

How it works. The fund holds three overlapping sets of options on IBIT or a similar bitcoin asset. Each month one set expires and a new one is added. The fund buys options that give the upside and sells others to help pay for them. The sold options set the ceiling. Part of the money sits in bonds, and their interest also helps pay for the protection.

About the protection. For each set, protection typically starts at about 90% of the asset's price when the options are bought. So the maximum loss per set is about 10% before fees. But the fund can move these levels, and the sets start at different times. So, as BlackRock writes, the fund has no fixed protection level, floor or cap. If bitcoin rises first and then falls, the loss from the new level can be more than 10%.

Context. Cointelegraph calls PBIT BlackRock's third bitcoin fund after IBIT and BITA, a fund that earns income by selling options. IBIT is the world's largest spot bitcoin ETF, with $65.7B in assets according to the outlet. Similar buffered funds already exist from Calamos, First Trust and Innovator. BlackRock still has no spot ETFs for Solana or XRP.

Confirmed facts

• On 19 October 2026 BlackRock filed a preliminary prospectus with the SEC for the iShares Bitcoin Managed Protection ETF (PBIT).^[1][2]
• The fund does not invest directly in bitcoin or bitcoin exchange-traded products; it uses options on IBIT or similar bitcoin assets.^[1]
• The fund typically holds three overlapping sets of options; each month one expires and a new one is added.^[1]
• For each set, the initial maximum loss is about 10% before fees, with protection starting at about 90% of the asset's value.^[1][2]
• The fund warns it does not provide a fixed protection start value, floor or cap.^[1][2]
• The filing asks to take effect 75 days after filing; the fee is left blank in the prospectus.^[1]
• IBIT has $65.7B in net assets.^[2]

Implications

• ConfirmedIf the fund launches, cautious investors get a BlackRock bitcoin product with limited losses, but also limited gains.
• Our readingBlackRock is growing its line-up with new strategies on bitcoin and ether rather than new coins.

Still unknown

• What the fee will be and which exchange will list it.
• Where exactly the cap will sit: the sold options set it, and it will change.
• When the fund will launch: the SEC can ask questions and timing can slip.

Who it affects

US. Anyone who wants bitcoin but fears deep drops

Sources

1. US SEC (EDGAR), iShares Trust: Form 485APOS: iShares Bitcoin Managed Protection ETF prospectus October 19, 2026 · official
2. Cointelegraph: BlackRock files for third Bitcoin ETF, still no Solana or XRP October 20, 2026 · media