Robinhood Markets stock (NASDAQ: HOOD) has lost about one-third of its value over the past month. While sentiment surrounding the stock has been weak since the company published a relatively tough set of Q3 results in late November, the increasingly hawkish stance by the Federal Reserve and concerns regarding the regulatory scrutiny into the company's revenue model, which entails selling the order flow of its customers to market makers, have also weighed on the stock price.