shares of third harmonic bio inc tumbled 75 in premarket trading on thursday after the company said it discontinued the phase 1b study of its treatment for chronic inducible urticaria a common inflammatory skin condition over safety concerns third harmonic said it plans to provide the full data from the study as well as an update on its corporate strategy in early 2023 the companys stock is up 06 over the last three months while the sp 500 is down 161