All the units are owned by ROSCOs (Rolling Stock Operating Company) with the electric units owned by Angel Trains except the class 350/2s which are owned by Porterbrook, class 380s which are owned by HSBC Rail, while the diesel units are owned by HSBC Rail.
All the units are owned by ROSCOs (Rolling Stock Operating Company), apart from the 360/2s which are owned by BAA for the Heathrow Express and Heathrow Connect services. The 350/1,360/1,444 and 450 electric units are owned by Angel Trains, the class 350/2s are owned by Porterbrook and class 380s are owned by HSBC Rail.