Certain Stock Options of Castle Biosciences, Inc. are subject to a Lock-Up Agreement Ending on 21-JAN-2020. These Stock Options will be under lockup for 181 days starting from 24-JUL-2019 to 21-JAN-2020. Details: The company, executive officers and directors and other existing security holders have agreed not to sell or transfer any shares of common stock or securities convertible into or exchangeable or exercisable for common stock, for 180 days after the date of the prospectus without first obtaining the written consent of SVB Leerink LLC and Robert W. Baird & Co.