Certain Common Stock of C4 Therapeutics, Inc. are subject to a Lock-Up Agreement Ending on 31-MAR-2021. These Common Stock will be under lockup for 181 days starting from 1-OCT-2020 to 31-MAR-2021. Details: All of company's directors and officers and the holders of substantially all of issuer's capital stock, options and warrants have entered into lock-up agreements with company and have entered into or will enter into lock-up agreements with the underwriters and have agreed not to dispose of or hedge any of their common stock or securities convertible into or exchangeable for shares of common stock during the period from the date of this prospectus continuing through the date 180 days thereafter, subject to certain exceptions