BlackRock files for Bitcoin ETF that buffers the first 10% loss

BlackRock asked US regulators on October 19, 2026 to approve a Bitcoin fund built to cap losses. The iShares Bitcoin Managed Protection ETF, ticker PBIT, would shield roughly the first 10% of a drop. It would also cap the gains.

The filing landed at the Securities and Exchange Commission as a post-effective amendment under the iShares Trust. It is a draft. BlackRock says the terms are not final and could change before any launch.

How the protection would work

PBIT would not hold bitcoin at all. Instead it buys call options tied to IBIT, BlackRock's spot Bitcoin fund, and keeps the rest in cash and short-term bonds. The option spreads run in three overlapping tranches, each starting in a different month. One tranche expires and a fresh one opens as the months roll forward.

Each tranche sets its protection level near 90% of the reference price when the options are bought, according to the prospectus. That leaves holders exposed to about the first 10% of any fall, before fees. The upside has a ceiling. BlackRock pays for the protection by selling higher-priced calls, and those sales cap how much the fund can earn in each tranche.

Funds like this are known as buffered or defined-outcome ETFs. The pitch is simple. Give up some of the top-end return, and in exchange a slice of any loss gets absorbed. Stock-market versions have sold well for years. BlackRock now wants to run the same idea on bitcoin, an asset that can move 10% in a single session.

For anyone new to these products, it helps to start with how a Bitcoin ETF compares with buying bitcoin directly, because PBIT stacks options on top of a fund that already stands in for the coin.

What BlackRock has not said

Key details are blank. The filing lists no management fee. It names no exchange and gives no firm launch date. One date in the draft points to 2027, and BlackRock chose a provision that would make the registration effective about 75 days after filing. Not launched, not priced, not dated.

BlackRock is also plain about the limits. The prospectus says there is no assurance the strategy will succeed and that investors may lose some or all of their money. The buffer resets with each tranche, measured from a new starting price. So if bitcoin climbs and then slides, a holder can lose more than the headline 10% figure suggests.

A crowded idea with BlackRock's reach

This is BlackRock's third Bitcoin ETF filing. James Seyffart, an analyst at Bloomberg Intelligence, flagged it as such and said the firm 'tends to make a big splash' when it enters a new corner of the market, according to Decrypt. BlackRock launched the iShares Bitcoin Premium Income ETF, ticker BITA, in June 2026. It still offers crypto products only for bitcoin and ether.

The idea itself is not new. Calamos, First Trust and Innovator already run defined-outcome Bitcoin funds that swap capped gains for a buffer. What BlackRock brings is reach. Its spot fund, IBIT, pulled in $665.2 million on Monday, October 19, 2026, the only one of 12 US spot Bitcoin ETFs to gain money that day, according to SoSoValue data reported by Decrypt. Across all 12 funds the net total was $526.6 million, and IBIT held $66.37 billion in assets.

Demand has cooled. US spot Bitcoin ETFs shed about $910 million over the previous two weeks, and bitcoin traded near $81,600 on October 20, 2026, down about 2% on the day, according to Decrypt. The slide follows the drop that took bitcoin under $81,000 after hot US inflation data earlier in the month.

What to watch

Regulators now hold the draft, and the SEC can ask for changes before the fund is cleared to trade. Later amendments should fill in the fee, a listing exchange and a launch date. Those blanks will say more about who the fund is for than any marketing line. A buffer that resets each month, with a cap on the upside, is a different bet from simply holding bitcoin. Cautious buyers may take it. Others will not.