As reported by Alex Svanevik, from the address of the Ethereum wallet loaded up to 530,000 ETH, since September 25, there has been a steady decrease in coins - worth almost USD 90 million at the time. The whale that owns the wallet has been dropping its cryptocurrencies on the market for almost three months. To date, it has already sold over 321,000 ETH in several transactions. Interestingly, this address was inactive (not including transactions with zero value) and HODL it since 2015, since the presale of ICO.
According to Etherscan, the first transaction on the account took place on September 25, then, more or less every two weeks, subsequent tokens were removed from the account. It is not clear why this "whale account" has been inactive for so long, or why this whale is getting rid of its coins now.