Arthur Hayes, co-founder of BitMEX, has disclosed his investment portfolio via a tweet. His holdings include a mix of traditional stocks and cryptocurrencies. Hayes's stock investments span sectors such as gold, silver, copper, uranium mining, oil giants, defense, and Latin American energy. In the cryptocurrency space, he holds Bitcoin (BTC), Ethereum (ETH), Zcash (ZEC), and HYPE. Additionally, Hayes invests in physical gold.