Anschutz Entertainment Group
Onex Corporation
Populous (company)
Oak View Group
HKS, Inc.
Comcast Spectacor
The Anschutz Corporation
Aramark
HOK (firm)
DoubleTree
Hard Rock Cafe
Defunct property management group
smgworld.com
SMG, formerly Spectacor Management Group, was an American worldwide venue management group headquartered in West Conshohocken, Pennsylvania, that specialized in managing publicly owned facilities. Wikipedia