Two brokerage units of Robinhood Markets agreed to pay $45 million to settle an investigation by the Securities and Exchange Commission into a range of alleged violations, including one stemming from a 2021 data breach that exposed millions of customer names and emails. The settlement is the latest in a string of big penalties paid by Robinhood as it has grown from a disruptive startup into a more established financial firm. In the November 2021 breach, email addresses for about five million Robinhood users were exposed, as were the full names of a different group of about two million users, the Menlo Park, Calif.-based company said at the time.