| ACA MEDICAL & ENGRG SERVICES PTE. LTD. | 202040700D | Boon Lay | 42301 | 2020 |
| AIK LEONG PLUMBING CONSTRUCTION PTE LTD | 199601215W | Boon Lay | 42301 | 1996 |
| AQUATECH PRODUCTS AND SERVICES PTE. LTD. | 198802547Z | Eunos | 42301 | 1988 |
| ASIA SUPPLY TRADING PTE. LTD. | 200704963H | Boon Lay | 28291 | 2007 |
| ASL ENGINEERING PTE. LTD. | 200504801H | Dairy Farm | 42301 | 2005 |
| ATSUMA INDUSTRIAL ENGINEERING PTE LTD | 198804585C | Boon Lay | 28300 | 1988 |
| CALIBRE SERVICES AND SOLUTIONS PTE. LTD. | 200517155C | Boon Lay | 71122 | 2005 |
| CHAN LAM CONSTRUCTION PTE LTD | 198801370R | Admiralty | 41009 | 1988 |
| CHINA RAILWAY FIRST GROUP CO., LTD. SINGAPORE BRANCH | T15FC0036H | Ang Mo Kio | 42200 | 2015 |
| EXPRESS TUNNELLING PTE. LTD. | 199506970Z | Buona Vista | 42200 | 1995 |
| GASHUBIN ENGINEERING PRIVATE LIMITED | 200514507H | Eunos | 42301 | 2005 |
| HIAP ENGINEERING & CONSTRUCTION PTE LTD | 199800147N | Ang Mo Kio | 41001 | 1998 |
| HME TECHNOLOGIES PTE. LTD. | 199700248R | Boon Lay | 28300 | 1997 |
| HOCK HAI CIVIL ENGINEERING & BUILDING PTE LTD | 199606940E | Mandai | 42301 | 1996 |
| HONG HOCK GLOBAL PTE. LTD. | 201333837H | Canberra | 42301 | 2013 |
| HONG LIP ENGINEERING WORKS PTE LTD | 199306974R | Boon Lay | 42200 | 1993 |
| HSC PIPELINE ENGINEERING PTE LTD | 199300255C | Canberra | 42301 | 1993 |
| HUNG YAO SHENG ENGINEERING PTE. LTD. | 201320791W | Mandai | 71129 | 2013 |
| IGM CONSTRUCTION (S) PTE. LTD. | 201102148M | Ang Mo Kio | 42100 | 2011 |
| JOHNSON PACIFIC PTE LTD | 198903742N | Hougang | 42301 | 1989 |
| KAEFER PROSTAR PTE. LTD. | 198302078W | Eunos | 71122 | 1983 |
| KEIFER CONSTRUCTION PRIVATE LIMITED | 200721637W | Changi | 41001 | 2007 |
| KEPPEL DHCS PTE. LTD. | 199804799M | Sentosa | 36000 | 1998 |
| KEPPEL ENERGY NEXUS PTE. LTD. | 200502942M | Sentosa | 42301 | 2005 |
| KH ENGINEERING & CONSTRUCTOR PTE. LTD. | 201403668W | Boon Lay | 41001 | 2014 |
| KIT CHUN ENTERPRISE PTE. LTD. | 200609069C | Canberra | 43220 | 2006 |
| KURITA (SINGAPORE) PTE. LTD. | 197801706E | Boon Lay | 20293 | 1978 |
| LAW BROTHERS CONSTRUCTION PTE. LTD. | 201506115C | Canberra | 42200 | 2015 |
| LEIGHTON CONTRACTORS (MECHANICAL & ENGINEERING) PTE. LTD. | 196900181G | Orchard | 38200 | 1969 |
| LIH MING PTE. LTD. | 200202569E | Canberra | 42301 | 2002 |
| LT SAMBO CO., LTD. (SINGAPORE BRANCH) | S96FC5252G | Boon Lay | 42200 | 1996 |
| MACBUILD CONSTRUCTION PTE. LTD. | 200708200D | Alexandra | 41001 | 2007 |
| MECHLINK QUALITY MANAGEMENT PTE. LTD. | 200413320H | Ang Mo Kio | 42301 | 2004 |
| MILLENNIUM PLUMBING & SANITARY PTE. LTD. | 200208841N | Eunos | 42301 | 2002 |
| NGEE CHIN ENGINEERING PTE LTD | 198100053W | Admiralty | 24310 | 1981 |
| O LINER TECHNOLOGY PTE LTD | 199902653M | Eunos | 42301 | 1999 |
| P3 TECHNOLOGY ENGINEERING PTE. LTD. | 201120211R | Canberra | 42301 | 2011 |
| PAN ALLIANCE TECHNOLOGY INTERNATIONAL PTE. LTD. | 200207583G | Admiralty | 42301 | 2002 |
| PERMA-LINER INDUSTRIES (SINGAPORE) PTE. LTD. | 201413940G | Dairy Farm | 71129 | 2014 |
| PMPS LINER TECHNOLOGY (SINGAPORE) PTE. LTD. | 200711163C | Boon Lay | 42301 | 2007 |
| PRIME ORBITAL TECHNOLOGIES PTE LTD | 199800982G | Boon Lay | 28300 | 1998 |
| PUMPCO INTERNATIONAL PTE LTD | 199606101H | Balestier | 28129 | 1996 |
| QINDA ENGINEERING PTE LTD | 199903725G | Boon Lay | 43220 | 1999 |
| SAM LAIN EQUIPMENT SERVICES PTE LTD | 198801589R | Boon Lay | 42301 | 1988 |
| SHENG KEONG CONSTRUCTION PTE. LTD. | 200202281Z | Changi | 41001 | 2002 |
| SHINGDA CONSTRUCTION PTE. LTD. | 198602367H | Admiralty | 42301 | 1986 |
| SING GUAN SENG CORPORATION PTE. LTD. | 200203929H | Mandai | 42301 | 2002 |
| SING YIET CIVIL ENGINEERING CONTRACTOR PTE LTD | 198900251N | Admiralty | 42301 | 1989 |
| SOCK KWENG CONSTRUCTION PTE LTD | 200108065D | Canberra | 42301 | 2001 |
| SOON LI HENG CIVIL ENGINEERING PTE LTD | 199406923E | Pasir Ris | 42301 | 1994 |
| SUNTECH BUILDING SERVICES AND TRADING PTE LTD | 199106442R | Ang Mo Kio | 42301 | 1991 |
| TECH PLUMBING ENGINEERING PTE. LTD. | 200501135Z | Eunos | 43220 | 2005 |
| TOH BAN SENG CONTRACTOR PTE LTD | 198402463M | Eunos | 42301 | 1984 |
| UE H2O PTE. LTD. | 197800668M | Boon Lay | 42301 | 1978 |
| UES HOLDINGS PTE. LTD. | 196600065Z | Boon Lay | 42301 | 1966 |
| UHP TECHNOLOGY PTE. LTD. | 200104308W | Ang Mo Kio | 25999 | 2001 |
| UPM TECHNOLOGY PTE. LTD. | 200515159M | Boon Lay | 25120 | 2005 |
| WEEWAH INTEGRATED ENGINEERING PTE. LTD. | 199000143C | Dairy Farm | 43220 | 1990 |
| WF ENGINEERING PTE. LTD. | 197902008E | Boon Lay | 42301 | 1979 |
| WHOLETECH SYSTEM HITECH (S) PTE. LTD. | 199602938N | Canberra | 42301 | 1996 |
| XING YUAN CIVIL ENGINEERING & BUILDING PTE. LTD. | 201230350M | MacPherson | 42301 | 2012 |
| YTL CE AND BUILDER PTE. LTD. | 201523154H | Dairy Farm | 42301 | 2015 |
| AEGIS ENGINEERING & CONSULTANCY PTE. LTD. Not yet published | 200711990D | Admiralty | 42301 | 2007 |
| BOON WEE CONST (S) PTE. LTD. Not yet published | 201107190K | Bedok | 38100 | 2011 |
| C & A TUNNELING PTE. LTD. Not yet published | 200818881E | Admiralty | 42301 | 2008 |
| CENTURY WATER SYSTEMS & TECHNOLOGIES PTE. LTD. Not yet published | 201105107Z | Admiralty | 42301 | 2011 |
| COMMERCIAL AND DOMESTIC PLUMBING PTE. LTD. Not yet published | 200701918K | Buona Vista | 42301 | 2007 |
| EXIN ENGINEERING PTE. LTD. Not yet published | 200820828M | Boon Lay | 71122 | 2008 |
| GLOBAL JUPITER PTE. LTD. Not yet published | 201008232D | Admiralty | 42301 | 2010 |
| GOOD YEAR ENGINEERING WORKS PTE. LTD. Not yet published | 200711781M | Bedok | 25999 | 2007 |
| HYDRA TECH PTE. LTD. Not yet published | 201112102N | Boon Lay | 41001 | 2011 |
| JL PLUMBING & ENGINEERING PTE. LTD. Not yet published | 200823190C | Pasir Ris | 42301 | 2008 |
| KENTIG ENGINEERING PTE. LTD. Not yet published | 200807234M | Boon Lay | 42301 | 2008 |
| NETATECH ENGINEERING PTE. LTD. Not yet published | 201003904G | Bedok | 42301 | 2010 |
| OMNIVIEW PTE. LTD. Not yet published | 201009025K | Canberra | 42301 | 2010 |
| PARKLINK PTE. LTD. Not yet published | 200702530G | Balestier | 42301 | 2007 |
| SLK ENGINEERING PTE. LTD. Not yet published | 201108193Z | Canberra | 42301 | 2011 |
| STARS PLUMBING & ENGINEERING PTE. LTD. Not yet published | 200719473H | Ang Mo Kio | 42301 | 2007 |
| TEAMWELL ENGINEERING PTE. LTD. Not yet published | 201111494W | Ang Mo Kio | 42301 | 2011 |
| UIA TECHNOLOGY PTE. LTD. Not yet published | 201013185C | Canberra | 42301 | 2010 |