List of company working on mainframe

INFOSYS
HCL
ACCENTURE
TCS
IBM
PATNI
KANBY
CTS
COVANYS
EDS
WIPRO
POLARIS
L&T
VETTRI
SATHYAM/PCS
MASCON
SYNTEL
XANSA
HCL
HPS4
Ford
Hexaware
verizon
Mpowerss
MASTEK
ANZ
Iflex
CGI
HSBC
MPHASIS
MBT
CITI BANK
COLES MYERS
DETUSCHE BANK
NET CRAFT
INFINITY
PHENIX
EFUNDS
MINDTREE
MINDTEK
FEDILITY
TIMKEN
DIGITAL
KEANE
POLARIS
MAJORIS
US Software
Macro Soft
Nest
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Here is the list of company having monopoly in specific sectors:
Health care - Wipro(Cardinal,pedigree)
Banking - HSBC,IBM,ACCENTURE
Insurance - SATYAM,PATNI,IBM
Admin&production support - IBM,CSC,SATYAM