Cryptocurrency exchanges are currently holding at least $12.4 billion in bitcoin, ether, and tether, according to The Block. There are currently approximately 888,400 bitcoins (~5% of circulation), 10.6 million ether (10% of circulation) and 1.6 billion tether (39% of circulation) held in publicly known wallets of cryptocurrency exchanges. Binance specifically holds 234,700 BTC in cold storage.