Currently, the following three addresses of BTC sellers are tracked:
Mentougou address (balance 141.687K btc) https://platform.arkhamintelligence.com/explorer/entity/mt-gox
German government address (balance 39.826K btc) https://platform.arkhamintelligence.com/explorer/entity/germany
U.S. government address (balance 213.297K btc) https://platform.arkhamintelligence.com/explorer/entity/usg