According to Bloomberg, around 2% of Bitcoin addresses own 95% of the cryptocurrency Bitcoin.
The cryptocurrency analyst Glassnode offers the caveat that “one address can hold funds from...millions of users.” In an alternative measure based on Bitcoin ownership brackets, Glassnode found that:
While noting that both small and large Bitcoin investment are on the rise, Glassnode concluded that “around 2% of network entities control 71.5% of all Bitcoin” in an upper-bound estimate.