SHAREHOLDER NEWS: Johnson Fistel Investigates Proposed Sale of ImmunoGen

SAN DIEGO, Nov. 30, 2023 (GLOBE NEWSWIRE) -- Shareholder rights law firm Johnson Fistel, LLP has launched an investigation into whether the board members of ImmunoGen, Inc. (NASDAQ: IMGN) breached their fiduciary duties in connection with the proposed sale of the Company to AbbVie.