On a transaction record, is there a field that stores the user that creates the transaction? I can find the data in System Info sublist, but I would like to be able to easily display this in a report or listing view.

Workflows have access to the current User so you can have a simple workflow that stashes it on create. (scripts also but WFFTW)

The transaction field is {createdby} available through Saved Search. To have it available through UI create a new field populated by the search result

i had workflow on the brain that day (sorry about that) but yeah if we’re not talking workflows then you can just define a field with a dynamic default of “currrent user” no search or workflow, etc, needed. That said, it is something i use a lot in workflows basedon create of a record but won’t help you with searches/ reports.

You can also just look in the system notes of that record if you don't need a permanent solution.