Ooh - this is a good one... I'm not entirely sure if LANSweeper pulls that information...
Thanks to the guys on r/sysadmin over at Reddit, I can see that "Owner" is the account that added the computer to a domain - you can use some PowerShell to pull it:-
Reddit linkyHow you'd do that with Lansweeper, I'm not sure... I've not had much luck with making reports and I can't see the information in any of the standard asset tabs...
Sorry not to be more help
Mat