Robinhood users have faced a series of attacks on their trading accounts in recent weeks.<br />Bloomberg News reports that an internal review estimated the number of compromised users near 2,000.<br />According to Business Insider, the online trading company has not disclosed an exact number.<br />Robinhood security says security "is a top priority and something we take very seriously."<br />In response to the breach, Robinhood has started encouraging users to implement two-factor authentication.<br />The number of compromised accounts is a small fraction of the company's 13 million users.