Robinhood (HOOD) shares fell by more than 3.44% at the opening of the US stock market, reflecting a broader decline in cryptocurrency-related stocks. Coinbase (COIN) also saw a decrease, dropping 2.43%. The overall market experienced a downturn, with the Dow Jones Industrial Average down 0.69%, the Nasdaq Composite slipping 0.04%, and the S&P 500 declining 0.25%.