Shares of Provention Bio Inc. (NASDAQ:PRVB) closed March 13 at $24.10, up $17.40, or 259%, after Wall Street learned that collaborator Sanofi SA intends to acquire the firm for $25 per share in cash, which works out to an equity value of about $2.9 billion. The transaction brings Paris-based Sanofi the type 1 diabetes (T1D) therapy Tzield (teplizumab-mzwv), approved by the U.S. FDA in 2022 as the first and only therapy to delay the onset of stage 3 disease in adults and in pediatric patients ages 8 and older with T1D that has reached stage 2.