Jack Mallers Questioned MicroStrategy’s Bitcoin Strategy, Now He’s Stepping Down From Twenty One
Jack Mallers stepped down as CEO of Twenty One (XXI), a Tether-backed corporate Bitcoin treasury. The firm began trading Dec. 9, 2025, with about 43,500 BTC (~$4B). Tether gained full control in May 2026. The article links his exit to earlier public questions about mNAV and digital credit cash-flow assumptions. XXI shares fell about 13.5% to near $4.60.

