Great Sam !
Here is a list of Corporate aircraft(without "s" ) operators

in case you don't have them yet.
Good luck!
Jets:
Registration unknown:
2002 Gulfstream G100 148
1998 Beechjet 400A RK-190 Spencer Travel Services Ltd. Bangalore.
VT-AAA
1982 HS 125/700A NA0323 Reliance Transport & Travel Ltd. Mumbai.
VT-AMA
1988 Gulfstream 4 1060 Reliance Transport & Travel Ltd. Mumbai.
VT-BAV
2001 Gulfstream G100 143 Aditya Birla Technologies, Mumbai.
VT-DHA
2001 Global Express 9111 Reliance Indusries Ltd. Mumbai.
VT-EHS
1982 Learjet 29 29-003 Aviation Research Centre/Government of India Agency, Delhi.
VT-EIH
1984 Learjet 29 29-004 Aviation Research Centre/Government of India Agency, Delhi.
VT-EQZ
1967 HS 125/3B 25133 India International Airways P/L. Delhi.
VT-ETG
1986 Citation S/II S550-0089 Rusi H Modi/Tata Engineering Services Ltd. Calcutta.
VT-EUN
1982 Citation II 550-0352 Asia Aviation Ltd. Delhi.
VT-EUX
1995 Citation V Ultra 560-0299 State Government of Tamil Nadu, Madras.
VT-KMB
1987 Citation S/II S550-0135 Grasim India Ltd. Bombay.
VT-OBE
1984 HS 125/700B 7215 Oberoi Group/East India Hotels Ltd., New Delhi.
VT-OPJ
1995 CitationJet 525-0112 Jindal Iron & Steel Co Ltd. Mumbai.
VT-RAY
1989 BAe 125/800B 8165 Raymond Woollen Mills Ltd. Mumbai.
VT-TAT
1998 Falcon 2000 65 Taj Air Ltd/Megapode Airlines, Mumbai.
VT-TBT
1997 Falcon 2000 49 TATA
VT-TEL
1988 Beechjet 400 RJ-46 Spencer Travel Services Ltd. Bangalore.
VT-TTA
1987 Falcon 200 511 Taj Air Ltd/Megapode Airlines, Mumbai.
VT-UBG
1971 HS 125/F400B 25254 United Breweries Group/UB Ltd. Bangalore. 'Leana'
Turboprops:
Registration unknow:
2003 King Air B200 BB-1831
2002 Pilatus PC-12/45 472 Tata Iron & Steel Co. Jamshedpur.
1997 King Air C90B LJ-1496 TVS/Sundram Fasteners Ltd. Chennai.
VT-AJV
1987 King Air C90A LJ-1159 Orient Flying School, Chennai.
VT-ASB
1988 Reims/Cessna F406 F406-0031 Century Textiles & Industries Ltd. Mumbai.
VT-BAL
1997 King Air B200 BB-1563 Bajaj Auto Ltd. Delhi.
VT-BHL
1994 King Air 350 FL-105 Bharat Hotels Ltd. Srinigar.
VT-BSA
1994 King Air B200 BB-1485 Border Security Force, Delhi.
VT-CIL
1993 King Air B200 BB-1469 Coal India Ltd.
VT-DAR
1999 Pilatus PC-12/45 251 Deccan Aviation P/L. Jakkur-Bangalore.
VT-DAV
1999 Pilatus PC-12/45 252 Deccan Aviation P/L. Jakkur-Bangalore.
VT-DEJ
1995 King Air C90B LJ-1404 Lakshmi Machine Works Ltd. Coimbatore.
VT-EBB
1994 King Air B200 BB-1486 National Remote Sensing Agency, Hyderabad.
VT-EFB
1977 King Air C90 LJ-706 India Metals & Ferro Alloys Ltd. Orissa.
VT-EFG
1977 King Air C90 LJ-719 Government of Bihar, Patna.
VT-EGR
1981 King Air C90 LJ-967 Government of Maharashtra, Bombay-Juhu.
VT-EHB
1982 King Air B200 BB-972 Government of Orissa, Cuttack.
VT-EHY
1982 King Air C90 LJ-1008 Government of Punjab, Chandigarh.
VT-EID
1982 King Air B200C BL-56 Government of Madhya Pradesh, Bhopal.
VT-EJZ
1985 King Air C90A LJ-1100 Government of Haryana, Ambala.
VT-EMI
1986 King Air C90A LJ-1135 Indira Gandhi Rashtriya Uran Academy
VT-EMJ
1986 King Air C90A LJ-1137 Indira Gandhi Rashtriya Uran Academy
VT-ENL
1986 King Air B200 BB-1248 Aviation Research Centre, Cuttack, Orissa.
VT-ENM
1985 King Air B200 BB-1236 Aviation Research Centre, Cuttack, Orissa.
VT-EOA
1987 King Air B200C BL-129 Border Security Force, Delhi.
VT-EPA
1986 King Air B200 BB-1254 Aviation Research Centre, Cuttack, Orissa.
VT-EPY
1987 King Air B200 BB-1277 Government of Maharashtra, Bombay-Juhu.
VT-EQK
1988 King Air B200 BB-1288 National Remote Sensing Agency, Hyderabad.
VT-EQN
1988 King Air C90A LJ-1167 Government of Rajasthan, Jaipur.
VT-EQO
1987 King Air C90A LJ-1153 Government of Uttaranchal, Dehradoon.
VT-GUJ
1999 King Air B200 BB-1687 Gujarat Agro-Industries Ltd. Ahmebad.
VT-HYA
1994 King Air C90B LJ-1376 Government of Haryana, Nissar.
VT-JIL
1999 King Air C90B LJ-1573 Jaypee Ventures Ltd. Delhi.
VT-JKC
1985 King Air B200 BB-1198 JK Corp. New Delhi.
VT-JNK
1997 King Air 350 FL-160 Government of Jammu & Kashmir.
VT-JPK
1991 King Air C90A LJ-1278 Aerial Services P/L. Juhu.
VT-JRD
1997 King Air C90B LJ-1485 Tata Iron & Steel Co. Jamshedpur.
VT-JVL
2002 King Air B200 BB-1815 Jay Pee Ventures Ltd. New Delhi.
VT-KDA
2000 Beech 1900D UE-284 Reliance Travel & Transport Ltd.
Mumbai.
VT-LNT
1993 King Air B200 BB-1468 Larsen & Toubro Ltd. Mumbai.
VT-MGJ
1998 King Air 350 FL-192 Government of Maharashtra, Mumbai.
VT-MPG
1993 King Air B200 BB-1445 Government of Chattisgarh, Raipur.
VT-MPT
2001 King Air B200 BB-1775 Government of Madhya Pradesh, Bhopal.
VT-NEI
1985 King Air C90A LJ-1116 National Energy Processing Co/NEPC Airlines, Madras.
VT-NKF
1995 King Air C90B LJ-1402 Bajaj Tempo Ltd. Akurdi.
VT-PPC
1994 King Air C90B LJ-1371 Finolex Cables Ltd. Pune.
VT-RAM
1978 King Air C90 LJ-790 Lake Palace Hotels & Motels Ltd. Udaipur.
VT-RLL
1994 King Air C90B LJ-1369 Vidyut Travel Services Ltd. Delhi.
VT-RSB
1989 King Air B200 BB-1317 Hiadalco Industries Ltd/Birla Co. Mumbai.
VT-SDJ
1997 King Air B200 BB-1567 Sundaram Fiance Ltd/Jinda Steel & Power Ltd. New Delhi.
VT-SLK
1991 King Air C90A LJ-1270 Kirloskar Oil Engines Ltd. Pune.
VT-TIS
1995 King Air C90B LJ-1393 Tata Iron & Steel Co. Jamshedpur.
VT-TSA
2002 Pilatus PC-12/45 445 Tata Iron & Steel Co. Jamshedpur.
VT-TVS
1997 King Air B200 BB-1572 TVS Motor Co. Chennai.
VT-UBA
1977 King Air C90 LJ-711 McDowell & Co. Bangalore.
VT-UPA
1994 King Air 300LW FA-230 Government of Uttar Pradesh, Lucknow.
VT-UPG
2003 King Air B200 BB-1818 Government of Uttar Pradesh, Lucknow.
VT-UPZ
1995 King Air C90B LJ-1400 Government of Uttar Pradesh, Lucknow.
VT-VHL
1987 King Air B200 BB-1267 Venkateshwara Hatcheries Group, Pun, Maharashtra.
VT-VIL
1994 King Air C90B LJ-1374 Videcon India Ltd.