I have a few finance related forums - mostly targeted at an Australian audience.
One is a broad investment related forum, currently running vB 3.8.x but I'm working on migrating the site to XF over Christmas.
A second is real estate specific - again running vB v3.8.x with plans to migrate to XF once I'm happy with the setup of that first site. This site is very busy and has a very active moderation team, so I am expecting to possibly need to code a few add-ons to help the moderators do what they need to do. I'm using the first forum as a testing ground since it isn't as busy.
A third site is associated with a funds management analysis tool I built using vB v3.8.x as a platform - this will also be migrated to XenForo at some point when I find the time. The forum is mostly just used for technical support and discussion of site functionality rather than being a destination in its own right.
I have a small sharemarket based discussion forum already running on XenForo - but that's not yet open to the public, it started life as a private discussion for investors in a privately owned company that I was involved in, but I plan on expanding its focus and opening it up to the public at some point.