According to Jason Fang, investors are choosing Bitcoin treasury companies over holding BTC directly, with 'Strategy' leading this theme (source: Jason Fang, X post dated Aug 15, 2025). For traders, MicroStrategy (MSTR) is a primary BTC proxy because the company discloses substantial Bitcoin holdings and a policy to acquire and hold BTC as a treasury reserve asset, making its equity highly sensitive to BTC price moves (source: MicroStrategy investor relations and SEC filings). A practical setup is to monitor the MSTR/BTC ratio and the premium or discount of MSTR’s market capitalization versus the mark-to-market value of its disclosed BTC holdings plus core software business, while tracking any convertible note issuances or at-the-market equity programs that alter exposure and dilution (source: MicroStrategy SEC filings and press releases). Other listed names with disclosed BTC on balance sheet include Tesla (TSLA) and Block (SQ), providing alternative BTC-linked exposure with distinct operating risks and beta profiles (source: Tesla and Block SEC filings). This rotation theme suggests monitoring liquidity and tracking differences between BTC spot and equity proxies to manage basis risk, as highlighted by the author (source: Jason Fang, X).