Robinhood Markets (HOOD 3.76%), the online brokerage that popularized commission-free trading, went public in July 2021 at $38 a share. Its stock hit an all-time high of $70.29 less than a week later, but it dropped below $7 by the following June.Robinhood's stock plummeted as rising interest rates curbed the market's appetite for the higher-risk stocks, options, and cryptocurrencies that have driven most of its growth during the pandemic. However, its stock recovered over the following two years as interes ...