By default, the Contact owner and Company owner properties are independent and do not sync. This means a user who owns a company record may not own its associated contact records. If you want to keep the owners consistent between company and contact, you should turn on your sync ownership settings.
To sync ownership between contacts and companies:
In your HubSpot account, click the settings iconsettings in the main navigation bar.
In the left sidebar menu, navigate to Objects > Contacts & Companies.
Click to toggle the Assign company owner to contact by default switch on. This enables the sync.
With this setting enabled:
The Company owner property will update the Contact owner property of the contacts associated with this company.
The Contact owner property will not overwrite the associated Company owner property unless the Company owner property is blank.
If the Contact owner property is updated to differ from the associated Company owner property, the Contact owner property will not revert back to the value in the associated Company owner property. This allows you to manually assign the contact to another user.