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A new iShares filing describes a fund that would buy and sell options on BlackRock's spot bitcoin ETF to cap both gains and losses; its fee, exchange and caps are not yet disclosed.
BlackRock, the sponsor of the iShares Bitcoin Trust ETF, has filed to launch a bitcoin fund designed to limit losses in exchange for capping gains. The proposed iShares Bitcoin Managed Protection ETF, ticker PBIT, would put a familiar options strategy for stock investors around bitcoin exposure, a so-called managed-protection or buffer design that trades away some upside for a limit on losses, aimed at holders who want the asset with a cushion under it.
The fund appears in a Form 485APOS filed by iShares Trust and accepted by the SEC at 4:44 p.m. ET on Monday. Its stated objective is to "provide upside exposure to the iShares Bitcoin Trust ETF (IBIT) and/or similar bitcoin exposure up to an approximate limit, while seeking to provide a level of downside protection." The management fee, listing exchange, caps and launch date are not yet disclosed; those fields are blank in the filing.
The fund would not hold bitcoin itself. The filing says it "does not invest directly in bitcoin or bitcoin exchange-traded products." Instead it buys and sells call options, contracts that pay off when IBIT rises above a set price, typically in three overlapping tranches, or sets of options bought at different times so that one expires each month, and holds bonds and cash to earn interest that helps pay for the options. The table below sets out each step in the prospectus's own words.
| Step | What the prospectus says |
|---|---|
| Buy calls | "Buying in-the-money Bitcoin Option contracts (i.e., with a strike price that is below the price of the Bitcoin Reference Asset at the beginning of the tranche period)" |
| Sell calls | "Selling out-of-the-money Bitcoin Option contracts (i.e., with a strike price that is higher than the price of the Bitcoin Reference Asset at the beginning of the tranche period)" |
| The cap | "The strike price of the sold Bitcoin Options establishes an approximate limit on participation in any increase in the value of the Bitcoin Reference Asset" |
| The cash sleeve | Fixed-income investments "to generate interest income to help offset the option cost and provide a level of protection against potential Fund losses" |
| Rolling | "each month one tranche expires and a new tranche is added" |
Source: iShares Trust, Form 485APOS, accession 0001193125-26-425335, Oct. 19, 2026.
The floor sits in the strike price of the calls the fund buys. In BlackRock's words: "the Tranche Protection Start Value typically is set at approximately 90% of the value of the Bitcoin Reference Asset at the time the purchased Bitcoin Options are acquired, which establishes an initial maximum loss exposure to the Bitcoin Reference Asset for that tranche of approximately 10% (referred to as the 'Floor'), before taking into account fees and expenses as of the date acquired."
That level can move. The filing says "the Fund has broad discretion to increase or decrease the Tranche Protection Start Value for one or more tranches at any time," and that "if the value of the Bitcoin Reference Asset increases after the start of the tranche period, the potential loss for that tranche, measured from the then-current value of the Bitcoin Reference Asset, will exceed the Floor."
In Le Coin's view, this is BlackRock moving bitcoin into the product shelf financial advisers already use for stocks, where buffered and protected funds let clients take market exposure with a defined limit on losses. A version built on IBIT gives advisers who have held back on bitcoin's swings a way to offer it with a stated floor per tranche.
In Le Coin's view, the trade-off is the price of that floor. Selling calls to fund the protection caps the upside, and in an asset known for sharp rallies, the cap is where holders give up the most.
In Le Coin's view, the protection is narrower than the name suggests. The roughly 10% floor applies per tranche, before fees, at the moment the options are bought; it can be changed at BlackRock's discretion, and a buyer who comes in after a rally can lose more than 10%. The filing warns that "investors may lose some or all of their money." Without the fee and caps, there is no way yet to judge what the protection costs.
The tell is the amended filing that fills in the blanks: the management fee, the exchange and the first tranche caps. Those numbers will show how much upside a holder gives up for the floor.
Holding the Corner.
Not financial advice.