An activist investor has taken a stake in CarMax, with some reports specifying that Starboard has built a $350 million position and nominated two members to the company's board. The investment has led to a rise in CarMax's stock price. The activist investor is reportedly pushing for changes, with one outlet noting that the new CEO must "move quickly", although not all analysts are altering their outlook, as JPMorgan is maintaining its underweight rating on the stock.