Shares of companies tied to Bitcoin experienced declines in pre-market trading on Monday. At the time of writing, Strategy (MSTR.US) dropped more than 2.5%, Robinhood (HOOD.US) fell over 1.8%, Circle (CRCL.US) declined more than 1.4%, and Coinbase (COIN.US) was down over 2%. Bitcoin briefly fell below $65,000, hitting a low of $64,300.87.