Name of a few renowned & satisfied customers of HALLMARK products & services:
- Royal Calcutta Golf Club
- Steel Authority of India
- Horticulture Development Foundation
- Lafarge India Limited
- Techno polis
- Mani- Group
- RBM - Tantia Joint Venture
- Vedic Village Developers
- SRC Projects Limited, Salem
- L&T Ltd, Guwahti
- Tata Tea Ltd. - Assam.
- Goodricke Group Ltd. West Bengal & Assam.
- Apeejay Group Ltd. - Assam.
- Duncan Industry Ltd. West Bengal.
- Eveready (India) Ltd. - West Bengal & Assam
- ITC Ltd. - Kolkata & Triveni (WB).
- Orissa Sponge Iron Ltd. - Orissa.
- B A L C O - Chattishgarh
- N A L C O - Orissa
- Ramkrishna Mission - Narendrapur (WB).
- Gwalior Chemicals Ltd. - Madhya Pradesh
- C V Raman College of Engineering - Orissa.
- Central Research Institute for Jute and Allied Fibres - Kolkata.
- Emami Group Ltd. - Orissa.
- Webel Ltd. - Kolkata.
- National Games Sports Complex- Guwahati (Subcontracted from L&T).
- G.B Plant Medical College - Agartala (Subcontracted from L&T).
- South City Projects (Kolkata) Ltd - Kolkata
