Your statement #1 is ambiguous about whether you made more than one of each kind. If it really matters, use #2.
I don't know what "buy-side" or "sell-side" institutions are, but I don't see the harm with your first sentence. Again, if there is some question about how many of which type, that can be handled in a follow up question. Your second sentence seems un-necessarily detailed.
Student or Learner