A billion-dollar server company just lost more than 40% of its value following a short-seller report

French technology group 2CRSi’s stock tumbled more than 40% after accusations from a New York–based short seller — panicking retail investors in France, who sold other unrelated companies in the space. Shares in 2CRSi, which designs and manufactures computer servers for data centers, slumped 43% in Paris, bringing its market capitalization down from about €1 billion ($1.15 billion) to below €600 million.