Key takeaways
- BlackRock files a preliminary prospectus for PBIT, an iShares fund that uses options on IBIT instead of holding bitcoin.
- Each PBIT options tranche initially targets a maximum loss exposure of about 10% before fees and expenses.
- Bloomberg analyst James Seyffart notes Calamos, First Trust and Innovator already run similar buffered bitcoin funds.
BlackRock filed a preliminary prospectus with the Securities and Exchange Commission (SEC) for the iShares Bitcoin Managed Protection ETF (PBIT), a fund that seeks to provide upside exposure to the iShares Bitcoin Trust ETF (IBIT) up to an approximate limit, while seeking to provide a level of downside protection. The proposed PBIT ETF would use options linked to IBIT rather than holding bitcoin directly.
BlackRock's lineup already includes two Bitcoin funds, making PBIT its third Bitcoin ETF filing. IBIT holds bitcoin directly and gives investors exposure through brokerage accounts, while BITA, the iShares Bitcoin Premium Income ETF, is designed to generate income through options trading.
How the Cushion Works
PBIT would use three overlapping sets of options contracts, typically replacing one each month. Each PBIT options tranche would initially target a maximum loss exposure of about 10% before fees and expenses.
Upside exposure to IBIT runs only up to an approximate limit, so PBIT investors would be giving up gains above a cap in exchange for a cushion that softens losses with options. The filing says the fund does not provide a fixed Floor or Tranche Cap Value.
The PBIT filing also says there can be no assurance the fund will achieve its investment objective, and investors may lose some or all of their money. The SEC filing adds that the fund may not be appropriate for all investors.
A Crowded Buffer Shelf
Bloomberg ETF analyst James Seyffart noted that similar buffered bitcoin funds already exist from Calamos, First Trust and Innovator. IBIT, the fund PBIT would track through options, had $65.7B in net assets, per BlackRock.
BITA, the iShares Bitcoin Premium Income ETF, launched in June 2026 and is designed to generate income through options trading. With PBIT, two of BlackRock's three Bitcoin ETF filings would rely on options trading rather than only holding bitcoin directly.
Why It Matters
PBIT would use options linked to IBIT rather than holding bitcoin directly, which makes it paper bitcoin stacked on paper bitcoin: a claim on derivatives of a fund, with no keys, no self-custody and no settlement on the Bitcoin network. We think BlackRock's incentive is plain, because a fund that softens losses with options while giving up gains above a cap turns bitcoin's volatility into a fee product for cautious investors and advisors who would never hold their own keys. That may widen mainstream access, but the upside PBIT investors surrender is exactly what rewards holders of a scarce asset that no central bank can print, so stackers holding sats in self-custody keep the whole trade without asking permission.
