Set desired date range, and only include users from these companies:
(list anonymized)
Export users to Google Sheet
Clean up data as necessary - e.g. make sure data in first name column is okay to use for personally addressing them
For any other user research or usability testing, you can define your criteria and ask someone with DB access to provide you with a list of users that match the criteria.
For example, when we did usability testing for the budget allocation part of the app overhaul, the list of users we emailed came from just querying the DB for people who allocated their budget in the past 30 days.