Hi Brian,
There is no TOP equivalent available, so instead, I suggest you either hardcode a filter to your report (eg where Risk Calc > 95) to limit it to the top few-or-so-if-any and adjust the "95" as needed when real data changes, and/or add a prompt to the report so users can choose the range dynamically. Neither is quite what you want, but perhaps one will be Close Enough.
Regards,
Doug