Coinbase, the largest cryptocurrency exchange in the United States, currently holds 2.27 million bitcoins (BTC).
This figure represents 10.8% of the total bitcoin supply, which is limited to 21 million units, all of which will be fully mined in the future. Of this total, Coinbase controls an amount equivalent to over $120 billion in current market value.
The total supply of bitcoin is expected to be fully mined by 2140 due to the halving, the mechanism that halves the rewards for mining a block that occurs approximately every four years.
