From Wikipedia, the free encyclopedia
The following is a list of the largest information technology consulting firms in the world, along with their corporate headquarters location and the total number of consultants they have. Many of these serve primarily as third-party consultants. Many enterprise software companies, such as SAP and Oracle , employ their own consultants for services related to their own products. Among the corporations listed below, the number of consultants listed is less than their total number of employees.
Note: Not all employees of these firms are consultants.
By continent Asia
Name
Headquarters
Consultants
As of
Tata Consultancy Services Mumbai , India 214,770
Infosys [1] Bangalore , India 113,796
Tavant Technologies Bangalore , India 700
Larsen & Toubro Infotech Mumbai , India 24,000
MphasiS Bangalore , India 34,000
Neusoft Group Shenyang , China 15,000
HCL Technologies Noida , India 58,129
NTT Data Tokyo , Japan 23,080
Oracle Financial Services Software Mumbai , India 10,000
Patni Computer Systems Mumbai , India 14,500
Mahindra Satyam Hyderabad , India 52,000
Tech Mahindra Pune , India 17,000
VanceInfo Beijing , China 11,000
Genpact Gurgaon , India 49,000
Wipro Technologies Bangalore , India 108,071
Europe
Name
Headquarters
Consultants
As of
Accenture Dublin , Ireland 230,000
Altran Paris , France 17,057
Atos Origin Paris , France 50,000
Capgemini Paris , France 92,000
Getronics Amsterdam , Netherlands 28,000
Indra Madrid , Spain 28,000
KPMG Amstelveen , Netherlands 136,500
Logica London , UK 40,000+
Siemens IT Solutions and Services Munich , Germany 40,000+
Steria Paris , France 19,000
Tieto Espoo , Finland 15,000
North America
Name
Headquarters
Consultants
As of
Affiliated Computer Services Dallas , TX 62,000
Booz Allen Hamilton McLean , VA 23,000
CGI Group Montreal , Canada 26,500
Cognizant Technology Solutions Teaneck , NJ 60,000+
Computer Sciences Corporation Falls Church , VA 91,000
Deloitte Touche Tohmatsu New York , NY 155,000
Electronic Data Systems Plano , TX 136,000
Ernst & Young New York , NY 135,000
Hitachi Consulting Dallas , TX 5,000
HP Enterprise Services Palo Alto , CA 140,000
IBM Global Business Services Armonk , NY 190,000
Keane Inc Boston , MA 14,500
Perot Systems Plano , TX 21,000
Science Applications International Corporation La Jolla , CA 44,000
TEKsystems Hanover , MD 20,000
Titan Corporation San Diego , CA 12,000
Unisys Blue Bell , PA 31,000
Defunct but notable References 
