Spot ETF structure and the flow of capital

Shares are not minted one at a time. The trust issues and redeems them in large blocks — the prospectuses describe baskets of ten thousand, twenty thousand or twenty-five thousand shares depending on the fund — and only registered broker-dealers that have entered into an authorised participant agreement with the sponsor and trustee may create or redeem those blocks. An ordinary shareholder has no right to redeem shares with the trust at all; to exit, a shareholder sells in the secondary market.

The creation mechanism is what keeps the share price close to the value of the bitcoin behind it. When shares trade above net asset value, an authorised participant can deliver the basket amount to the trust, receive newly issued shares, and sell them at the market price, capturing the difference. That supply pushes the market price back toward NAV. When shares trade below NAV, the same participant can buy shares in the market, redeem them with the trust for the basket amount, and sell the underlying, which removes shares from circulation and supports the price. The arbitrage is the mechanism; the authorised participant is the only party permitted to run it.

The basket amount may be delivered in cash, in bitcoin, or in a combination, and the permitted form differs between funds and has changed over time. Several prospectuses describe cash creations and redemptions as the default, with in-kind transactions permitted at the sponsor's discretion; others have since been approved to conduct in-kind creations and redemptions for bitcoin. The distinction matters because a cash creation requires the trust or its agent to buy bitcoin in the market, while an in-kind creation delivers coins directly. Both settle at a value equal to the NAV of the shares created or redeemed, and both are subject to per-order transaction fees and custody costs.

The creation and redemption flow is the channel through which the fund touches the spot market. A cash creation results in a purchase of bitcoin by the trust's agent; an in-kind creation does not. A redemption in cash results in a sale. That is a reported fact about the mechanism, and it is the reason fund flow data is treated as a window onto institutional participation.

What the mechanism does not establish is what a flow means for the future. A week of net creations shows that authorised participants delivered baskets and took shares; it does not show who bought those shares, why, or what they expect the price to do. The spot and futures page explains why the difference between a completed transfer and a derivative position matters when reading demand, and the market capitalisation page explains why a fund's assets under management and the asset's capitalisation are different quantities that should not be added together.

The full mechanics of the wrapper — what it holds, how the January 2024 approvals were framed, and how holding it differs from holding the asset — are set out on the spot bitcoin ETFs page. This article does not restate that material; it takes the structure as given and follows the capital through it.