You can find an owner portfolio on Reonomy in three ways. 

Quick Search:

When you know the owners name (person or company), you can search their name in the search bar to quickly find their profile.

Clicking on the name in the drop down will take you directly to their profile.

Filtered Owner Search:

Search by Owner Name, Reported Owner Name or Reported Owner Mailing Address using our filters on the Owner tab.

A filtered search will take you to a list of all the properties related to that owner/reported owner. To get to the owner profile from there, click on one of the properties and navigate to the profile via the owner tab.

Property page:
If you're on a property, navigate to the owner tab and click the owner name on the property card to be redirected to the owner profile.