It is not possible to run a report based solely on those participants who have not met their fundraising goal.

An alternative solution would be to report on all participants, and display their Goal and amount raised in the report and compare that way, by doing the following:

1. Go to Communities > Special Events > Friends Asking Friends > Kintera Thon
2. Hover over your event name and click Reports
3. From the drop-down menu choose People: Participant Detail
4. Click Run Report
5. Select the date range
6. Click Next
7. Select the field of Donation Amount to see how much has been raised, and the field of Participant Goal for the individual's goal
8. Select any other fields you would like to see
9. Click Finish
10. Choose Run Report Immediately
11. Click Run Report