Advanced Drainage Systems Inc.
China Lesso Group Holdings Ltd.
Egeplast A.S.
Finolex Industries Ltd
IPEX Inc.
JM Eagle Company Inc.
North American Pipe Corporation
Pipelife International GmbH
Plastika AS
Polypipe Plc
Royal Building Products
Sekisui Chemical Company Ltd
Tessenderlo Group
Tigre SA
Formosa Plastics Group