I had the same question a while back since I am in the same situation.
I assume you work for a frax as well.
Being Captain I log the PIC time when I am flying in the left seat and log SIC time when I am sitting in the right seat. Since all the SIC are type rated as Captains I give them the PIC time to help them build up their hours.
As far as the FAA is concerned if you are type rated as a Captain and are the pilot flying you can log the time PIC. Our company agrees but holds the "Captain of record" ultimately responsible even if the SIC has a captain type rating.
What I did hear is that the Airlines in the US only consider it PIC time if you are then "Captain of Record"