A study conducted by Diar indicates that over 50% of all Bitcoins ever mined is controlled by whales with 42% of them holding to their assets despite a continuous bearish trend that has been lasting for the whole 2018 now. Less than 1% of BTC addresses holds around $100 bln in BTC. 55% of all Bitcoins are stored on wallets with at least 200 BTC ($1,25 mln).
The study also illustrates that 87% of all Bitcoins are stored on wallets with at least 10 BTC - and there are is a mere 0.7% of all addresses that can boast this amount. Interestingly, more than a third of all Bitcoins are stored on the addresses with no outcoming transactions in their history. This draws a conclusion that the largest cryptoholders "hodl" the world's first cryptocurrency. There's also a possibility that a lot of early adopters have simply lost access to their wallets, and therefore, those coins are lost irreversebily.