Blackrock and Strategy entered 2026 controlling a massive share of bitcoin supply, highlighting accelerating institutional concentration as regulated ETFs and public companies tighten their grip on the world’s largest cryptocurrency. Blackrock Starts 2026 Holding 774K Bitcoin While Strategy Pushes Holdings to 674K Strategy Inc (Nasdaq: MSTR), and Blackrock’s Ishares Bitcoin Trust (IBIT) exchange-traded fund (ETF)