India's top business process outsourcing (BPO) companies posted a total revenue of Rs 32,246 crore (Rs 322.46 billion) in 2010-2011.

According to Dataquest, the top BPO companies maintained a growth rate of 13 per cent, the same as the previous year.

The number of people employed by top 20 BPO firms rose to 311,167 -- or 12 per cent over the year maintaining a revenue productivity of about Rs 10 lakh (Rs 1 million) per employee a year.

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Genpact (Rank 1)

Established in 1997, Genpact started off as the India-based business process operations for GE Capital.

In 2005, with equity investments from General Atlantic and Oak Hill Capital Partners, it became an independent company and was rebranded Genpact.

Revenue 2009-10: Rs 4,592 cr
Revenue 2010-11: Rs 5,680 cr
Growth (percentage): + 24

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TCS BPO (Rank 2)

TCS BPO is one of the leading players in the outsourcing industry.

It offers services in areas such as finance and accounting, banking, HR outsourcing, KPO, insurance, payroll, healthcare, telecom, media, travel and entertainment.

Revenue 2009-10: Rs 3142 cr
Revenue 2010-11: Rs 3928 cr
Growth (percentage): + 25

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Aegis BPO (Rank 3)

An Essar group company, Aegis is one of the leading outsourcing services in India.

The company has more than 50,000 employees across 50 locations serving banking, financial services, insurance, telecom, healthcare, travel and hospitality, consumer goods, retail, and technology sectors.

Revenue 2009-10: Rs 1,837 cr
Revenue 2010-11: Rs 2,352 cr
Growth (percentage): +28

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Wipro BPO (Rank 4)

Wipro BPO, one of the largest BPO players in India acquired Spectramind in 2002 expanding its operations across banking and capital markets, insurance, travel and hospitality, hi-tech manufacturing, telecom and healthcare sectors.

Revenue 2009-10: Rs 2,106 cr
Revenue 2010-11: Rs 2,249 cr
Growth (percentage): +7

FirstSource Solutions (Rank 5)

Firstsource offers customised business process management to customers in banking and financial services, customer services, telecom and media and healthcare sectors.

Its clients include Fortune 500 financial services, telecommunications and healthcare companies.

Revenue 2009-10: Rs 1,723 cr
Revenue 2010-11: Rs 1,833 cr
Growth (percentage): + 6

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WNS Global Services (Rank 6)

WNS Global Services is one of India's leading BPO companies that has evolved from being a captive company to a successful third-party provider servicing clients across multiple industries.

Revenue 2009-10: Rs 1,858 cr
Revenue 2010-11: Rs 1,685 cr
Growth (percentage): - 9

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Infosys BPO (Rank 7)

Infosys BPO, the business process outsourcing subsidiary of Infosys Technologies, was set up in April 2002.

The company focuses on integrated end-to-end outsourcing and delivery of result-oriented benefits through reduced costs.

Revenue 2009-10: Rs 1,383 cr
Revenue 2010-11: Rs 1,545 cr
Growth (percentage): +12

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Aditya Birla Minacs (Rank 8)

Aditya Birla Minacs was formed in 2007 merging TransWorks, one of India's first business process outsourcing (BPO) players, with Minacs, a North American CRM services company.

The company serves the manufacturing, banking, financial services, insurance, telecom, high technology, media, and entertainment, healthcare, and government and public sectors.

Revenue 2009-10: Rs 1,404 cr
Revenue 2010-11: Rs 1,518 cr
Growth (percentage): +8

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Accenture India (Rank 9)

Accenture is a global management consulting, technology services and outsourcing company, with more than 223,000 people serving clients in more than 120 countries.

Revenue 2009-10: Rs 1,135 cr
Revenue 2010-11: Rs 1,436 cr
Growth (percentage): +27

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IBM Global Process Services (Rank 10)

IBM Daksh has been renamed as IBM Global Process Services India. It operates 50 delivery centres across 40 countries.

Revenue 2009-10: Rs 1,212 cr
Revenue 2010-11: Rs 1,292 cr
Growth (percentage): +7

EXL Service (Rank 11)

EXL offers outsourcing services across insurance, banking, financial services, utilities, transportation and travel industries.

Revenue 2009-10: Rs 966 cr
Revenue 2010-11: Rs 1,224 cr
Growth (percentage): +27

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Cognizant BPO (Rank 12)

Cognizant Technology Solutions is an American multinational provider of custom information technology, consulting and business process outsourcing services.

Revenue 2009-10: Rs 858 cr
Revenue 2010-11: Rs 1,217 cr
Growth (percentage): +42

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Hinduja Global (Rank 13)

HGS, part of the Hinduja Group, offers back office processing, contact centre services and customised IT solutions to its global clientele.

Revenue 2009-10: Rs 759 cr
Revenue 2010-11: Rs 942 cr
Growth (percentage): +24

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Xchanging India (Rank 14)

Xchanging is one of the largest and fastest growing BPO companies. It offers procurement, accounting, human resources and technology services across industries.

Revenue 2009-10: Rs 956 cr
Revenue 2010-11: Rs 893 cr
Growth (percentage): -7

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Covergys India (Rank 15)

Convergys India, part of Convergys Corporation is headquartered in Ohio and has operations in Bangalore, Pune, Hyderabad, Mumbai and Gurgaon.

Revenue 2009-10: Rs 801 cr
Revenue 2010-11: Rs 891 cr
Growth (percentage): + 11

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Intelenet Global (Rank 16)

The company offers services for transaction processing, finance & accounting and human resource outsourcing services to Fortune 500 companies in the UK, USA, Australia and India.

Intelenet has 31,000 employees across 30 delivery centers globally in India.

Revenue 2009-10: Rs 775 cr
Revenue 2010-11: Rs 871 cr
Growth (percentage): +12

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HCL BESRV (Rank 17)

HCL's BPO business focuses on telecom, retail, banking and financial services, insurance, hi-tech & manufacturing, media, publishing and entertainment and Utilities.

Revenue 2009-10: Rs 1,044 cr
Revenue 2010-11: Rs 857 cr
Growth (percentage): - 18

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24/7 Customer (Rank 18)

Founded in April 2000, the Silicon Valley-headquarted 24/7 Customer is a global online technology and operations company with over 9,000 employees worldwide.

Revenue 2009-10: Rs 660 cr
Revenue 2010-11: Rs 716 cr
Growth (percentage): +8

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3i Infotech (Rank 19)

The company provides software products, IT services and business process outsourcing across insurance, banking, capital markets, mutual funds and asset management, wealth management, government, manufacturing and retail sectors.

Revenue 2009-10: Rs 779 cr
Revenue 2010-11: Rs 645 cr
Growth (percentage): - 17

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Mphasis BPO (Rank 20)

MphasiS offers end-to-end business process outsourcing services to Fortune 500 companies worldwide.

Revenue 2009-10: Rs 542 cr
Revenue 2010-11: Rs 472 cr
Growth (percentage): -13