Certain Restricted Stock Units of Alder BioPharmaceuticals, Inc. are subject to a Lock-Up Agreement Ending on 29-APR-2019. These Restricted Stock Units will be under lockup for 61 days starting from 27-FEB-2019 to 29-APR-2019. Details: The directors and certain of executive officers, and holders of a substantial majority of common stock have agreed that they will not offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of common stock or any securities convertible into or exercisable or exchangeable for common stock, for a period of 60 days and 45 days for non-employee directors and certain of their affiliated funds after the date of the prospectus without the prior written consent of J.P. Morgan Securities LLC and SVB Leerink LLC.