Bitcoin Treasury Stock: the mNAV Discount Explained

A share that does nothing but hold Bitcoin ought to be worth roughly what the Bitcoin behind it is worth. In practice that is almost never the case. At Twenty One Capital, the second-largest listed Bitcoin holder after Strategy, the gap is unusually wide at the moment: the company holds 43,514 Bitcoin and is valued on the stock market at roughly a third less. Its own chief executive conceded as much in writing on August 11, 2026.

If you are weighing whether to buy Bitcoin directly or through a share of this kind, that gap is the single most important number for your decision. It has a name, it can be calculated, and it comes out completely differently depending on the method used. This article uses a freshly filed quarterly report to show how the calculation works.

What a Bitcoin treasury stock is and how it differs from a Bitcoin ETF

Bitcoin treasury companies are listed firms whose principal asset is Bitcoin held on their own balance sheet. Strategy popularised the model; Twenty One Capital entered the field with backing from the stablecoin issuer Tether.

The difference from a Bitcoin ETF lies in the legal construction. A spot ETF is designed so that the price of a unit and the value of the holding stay close together. A listed company, by contrast, has a board, debt and operating costs, and its share price emerges from supply and demand for the share itself. The Twenty One Capital quarterly report puts this with unusual clarity: owning a share does not represent an ownership interest in the Bitcoin held by the company.