Need Help With Factset – ISIN Finding And Ownership Report

Hi guys! Anybody here has some experience with pulling data from Factset ?

I have difficulties with the identifiers and running reports: 1. I have a list of ISIN, which is super long so I cannot copy and paste one by one, so I copy all of them into the identifier search function and Factset returns a list of company. However, the number of companies recorded by Factset is much smaller than my ISIN list, so I need to find out which ones are missing. However I cannot get the ISIN of the company list that Factset gave me to compare with my original ISIN list. Can we get the ISIN list from given ticker/company name list ? Or do you have any suggestions to solve this problem?

I need to run a report of ownership of many companies. I don’t mind to do it many times (for example, divide my company list into 100 small parts and run the report one by one), but of course I don’t think I can repeat that for thousands of times. So is there any way to run such report from Factset ?

Many thanks in advance!