We are trying to understand (and document) how transparent think tank budgets are on where their funds come from. For this your rating is extremely valuable. Essentially, you are an interested citizen, trying to understand who pays for the think tank, and what it does. You should not spend more than 10-12 minutes on trying to find this information.
For the list of think tanks, check the separate list sent to you in the Excel sheet. Note that the financial information typically is under "About".. IMPORTANT: in case you don't find the information elsewhere, definitely look for the annual report. In many cases, this is where the information is.
Thanks for your diligent work on this -- we hope it will improve transparency for many institutions!