This depends a bit on how exactly you set this up. If you have a dedicated form for this, you can always create an active list of contacts who submitted the form. To do so, navigate to Menu > Contacts > Lists and create an active contact list. In the list, click Add filters > Form submissions, find your form and save the list. It will continue populating with new submissions.
Karsten Köhler HubSpot Freelancer | RevOps & CRM Consultant | Community Hall of Famer