WRDS (Wharton Research Data Services) (First time users will need to click on Register to request a user account and then fill out the form. It takes 24 hours to get approved.)
Select the CRSP variable SHRCD, which includes ADRs.
Bloomberg (available at Barcelona IESE Library Financial room).
Type ADRM and hit Enter. Do your search.
Alternatively visit the websites:
J.P. Morgan Depositary Receipts
BNY Mellon Depositary Receipts
