Super Micro Computer Inc. fell the most in a month on a report that the US Justice Department is looking into an ex-employee’s claims that the server maker violated accounting rules just a few years after settling a bookkeeping case with a top financial regulator.

Super Micro Computer's stock price fell sharply after the Wall Street Journal reported the company faces a federal investigation.

Super Micro Computer (SMCI) is being investigated by the U.S. Justice Department after a report by an activist short-selling firm. Read for more.