If by "company" you mean "system" then there are a couple of ways.
If you have audit logs enabled (SM19) then you can use SM20 to show you which transactions people have used.
If not, then you can certainly get it from the ST03 workload monitor. If you just want transaction lists then look at the monthly summaries. You'll be able to go back as far as ST03 is configured to keep.
Steve.