Filtration Control Limited supplies most major companies in the bus, train and commercial vehicle sector across Europe, Asia and the United States including:
- First Group Plc
- Stagecoach Group Plc
- Arriva Plc
- National Express Group Plc
- Go Ahead Group Plc
- Transdev Plc
- Metroline Ltd
- Abellio
- Arriva Trains Wales
- First Student Inc
- Northgate Plc
- Bombardier Inc
- CBM
- Halfords Group Plc
- Kowloon Motor Bus
- City Bus (Hong Kong)
- RATP
- Pullman Fleet Services
- Deutsch Bahn
- Swebus
- Irish Rail
- Translink
- Dublin Bus
- Bus Eireann
- Fullwards
- Centrebus Ltd
- East Yorkshire Motor Services Ltd
- Trent Barton Ltd
- RNLI