ATCO
ATCO Ltd . , operating as the ATCO Group , is a publicly-traded Canadian engineering , logistics and energy holding company based in Calgary , Alberta . 
<triplet> ATCO <subj> publicly-traded <obj> legal form <subj> Calgary <obj> headquarters location <triplet> ATCO <subj> holding company <obj> instance of <subj> Calgary <obj> headquarters location <triplet> Calgary <subj> Alberta <obj> located in the administrative territorial entity