India
- M/s. Aker Powergas Private Limited
- M/s. ACC Concrete Ltd
- M/s. Alfa Laval Ltd
- M/s. Ausenco, India
- M/s. Associated Cement Companies Limited
- M/s. Bureau Veritas
- M/s. Bateman Engineering (India) Pvt. Ltd
- M/s. Black & Veatch
- M/s. Blue Star Ltd
- M/s. Birla Copper Limited
- M/s. Chemtex Global Engineers Pvt. Ltd
- M/s. Dabhol Power Company
- M/s. Dresser Rand India Private Limited
- M/s. Foster Wheeler India Pvt. Ltd
- M/s. Gujarat Fluorochemicals Ltd
- M/s. Hindustan Unilever Ltd
- M/s. Hindustan Dorr-Oliver Limited
- M/s. IBI Chematur (Engg. & Cons.) Limited
- M/s. IOT Infrastructure & Energy Services Ltd
- M/s. IOT Engineering & Project Ltd
- M/s. IOT Anwesha Engineering & Construction Ltd
- M/s. Intertek Testing Services Pvt. Ltd
- M/s. Jindal Steel Project Ltd.
- M/s. ITC Ltd
- M/s. ION Exchange Infrastructure Ltd
- M/s. Kesar India Limited
- M/s. K. Raheja Corp
- M/s. L & T Infotech Limited
- M/s. Larsen & Toubro Limited
- M/s. Mecon Limited
- M/s. Neilsoft Ltd, India
- M/s. Nuclear Power Corpn, of India Ltd., Tarapur / Kaiga
- M/s. Reliance Industries Limited
- M/s. Reliance Engg. Assoc. Pvt. Ltd.
- M/s. Reliance Infocomm Engineering Limited
- M/s. Reliance Retail Limited
- M/s. Samsung Engineering, India
- M/s. Shimizu Corporation India Pvt. Ltd.
- M/s. Stone & Webster Rolta Ltd
- M/s. Technip KTI India Limited
- M/s. Toyo Engineering India Ltd
- M/s. Udhe India Limited
- M/s. Utkal Alumina International Limited
- M/s. Xytel India Pvt. Ltd.
Abroad
- M/s. Al Hassan Engineering Co. S.A.O.G., Sultanate of Oman
- M/s. Archirodon Construction (overseas) Co., Abudhabi
- M/s. Ballast Nedam International, Holland
- M/s. Fincimec s.P.a., Italy
- M/s. Hyundai Heavy Industries Co. Ltd. Korea
- M/s. Kharafi National, Kuwait
- M/s. Leading Synthetics Pty. Ltd. Australia
- M/s. Petrofac International Limited, Sharjah
- M/s. Siirtec Nigi s.P.a., Italy
- M/s. SNC Lavalin, Canada
- M/s. Tata Inc., USA
- M/s. Technip Limited, Abu Dhabi