No not an add-on just when you click "Users" > "User Upgrades" > "List Active Upgrades" the list that is output is "all" the active upgrades together with no way to separate them out if you have more than one.
So let's say I had 6 different user upgrades and had 1,000 in each totaling 6,000 active upgrades, the list would be 6,000 members long with no way of displaying the users in one "user upgrade" individually.