The top 200 IT companies in India posted the highest growth in four years.

The revenues soared by 25 per cent in 2010-11 to take combined turnover to $84 billion (Rs 3,84,250 crore).

The top 20 companies have contributed over 64 per cent to the combined revenue, according to a study by CyberMedia's Dataquest Research.

Tata Consultancy Services (Rank 1)

Revenue FY11: Rs 33,112 crore
Revenue FY10: Rs 26,576 crore
Growth FY11: 25%

TCS is the largest provider of information technology services in Asia and second largest provider of business process outsourcing services in India.

Headquartered in Mumbai, TCS has over 198,500 employees.

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Infosys Technologies (Rank 2)

Revenue FY11: Rs 25,997 crore
Revenue FY10: Rs 21,355 crore
Growth FY11: 22%

Infosys is the second largest IT company in India with 133,560 employees as of March 2011.

Infosys is ranked 28th globally in the list of IT services providing firms.

It has offices in 33 countries and development centers in India, China, Australia, UK, Canada, Brazil and Japan.

Wipro (Rank 3)

Revenue FY11: Rs 24,899 crore (Rs 248.99 billion)
Revenue FY10: Rs 21,949 crore (Rs 219.49 billion)
Growth FY11: 13%

Wipro is the third largest IT services company in India and employs more than 122,385 people worldwide as of March 2011.

Wipro is ranked 31 globally in 2011 in the list of IT service providers. The company does business in information technology, consumer care, lighting, engineering and healthcare businesses.

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Hewlett-Packard India (Rank 4)

Revenue FY11: Rs 23,227 crore (Rs 232.27 billion)
Revenue FY10: Rs 17,831 crore (Rs 178.31 billion)
Growth FY11: 30%

HP is one of the world's largest information technology companies, operating in almost every country.

HP specialises in developing and manufacturing computing, data storage and networking hardware, designing software and delivering services. It is headquartered in Palo Alto, California.

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Cognizant Technology Solutions (Rank 5)

Revenue FY11:  Rs 21,393 crore (Rs 213.93 billion)
Revenue FY10: Rs 15,646 crore (Rs 156.46 billion)
Growth FY11: 37%

Cognizant Technology Solutions has beaten Wipro for the first time in the June quarter to become the third largest software exporter from India.

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

It has been named to the 2010 Fortune 100 fastest-growing companies for the eighth consecutive year.

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IBM India (Rank 6)

Revenue FY11: Rs 14,132 crore (Rs 141.32 billion)
Revenue FY10: Rs 12,388 crore (Rs 123.88 billion)
Growth FY11: 14%

Headquarted in New York, IBM is a multinational computer technology and IT consulting corporation.

IBM has been present in India since 1992. IBM India's solutions and services span all major industries including financial services, healthcare, government, automotive, telecommunications and education.

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HCL Technologies (Rank 7)

Revenue FY11: Rs 14,111 crore (Rs 141.11 billion)
Revenue FY10: Rs 10,983 crore (Rs 109.83 billion)
Growth FY11: 28%

Headquartered in Noida, HCL Technologies is the IT services arm of HCL Enterprise, a $5.5 billion IT company.

HCL Technologies is fifth largest IT company in India and is ranked 48 in the global list of IT services providers.

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HCL Infosystems (Rank 8)

Revenue FY11: Rs 12,137 crore (Rs 121.37 billion)
Revenue FY10: Rs 11,956 crore (Rs 119.56 billion)
Growth FY11: 2%

HCL Infosystems, a subsidiary of HCL, has a presence in 170 locations and 300 service centres throughout India.

It offers a wide spectrum of ICT products that includes computing, storage, networking, security, telecom, imaging and retail.

Its manufacturing facilities are based in Chennai, Pondicherry and Uttarakhand. It is headquartered at Noida.

Ingram Micro India (Rank 9)

Revenue FY11: Rs 9,766 crore (Rs 97.66 billion)
Revenue FY10: Rs 7,234 crore (Rs 72.34 billion)
Growth FY11: 35%

Ingram Micro Inc is the world's largest technology distributor, providing sales, marketing and logistics services for the IT industry worldwide. Ingram Micro India is a subsidiary of this company, which operates in 34 countries.

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Redington India (Rank 10)

Revenue FY11: Rs 9,274 crore (Rs 92.74 billion)
Revenue FY10: Rs 7,024 crore (Rs 70.24 billion)
Growth FY11: 32%

Redington India commenced the operations in 1993 distributing information technology products.

The company gradually expanded its operations across India covering a broad range of IT and telecom products with offices in India, West Asia and Africa.

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Cisco Systems India (Rank 11)

Revenue FY11: Rs 8,157 crore (Rs 81.57 billion)
Revenue FY10: Rs 6,057 crore (Rs 60.57 billion)
Growth FY11: 35%

Headquartered in San Jose, California, Cisco designs and sells consumer electronics, networking, voice, and communications technology and services. Cisco has more than 70,000 employees.

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Oracle India (Rank 12)

Revenue FY11: Rs 7,934 crore (Rs 79.34 billion)
Revenue FY10: Rs 6,321 crore (Rs 63.21 billion)
Growth FY11: 26%

Oracle, an American multinational computer technology corporation specialises in developing and marketing hardware systems and enterprise software products.

Oracle established its Indian subsidiary in August 1993.

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Dell India (Rank 13)

Revenue FY11: Rs 7,666 crore (Rs 76.66 billion)
Revenue FY10: Rs 5,709 crore (Rs 57.09 billion)
Growth FY11: 34%

Dell India, a subsidiary of Dell Inc develops, sells and supports computers and related products and services.

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Intel India (Rank 14)

Revenue FY11: Rs 6,108 crore (Rs 61.08 billion)
Revenue FY10: Rs 5,160 crore (Rs 51.60 billion)
Growth FY11: 18%

An American multinational technology corporation headquartered in Santa Clara, California, Intel is world's largest semiconductor chip maker, based on revenue.

The Intel India development centre is Intel's largest non-manufacturing site outside the United States.

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Accenture India (Rank 15)

Accenture is a global management consulting, technology services and outsourcing company.

A Fortune Global 500 company, the company has more than 225,000 employees in 120 countries as of January 2011.

Revenue FY11: Rs 5,672 crore (Rs 56.72 billion)
Revenue FY10: Rs 4,800 crore (Rs 48 billion)
Growth FY11: 18%

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SAP India (Rank 16)

Revenue FY11: Rs 5,146 crore (Rs 51.46 billion)
Revenue FY10: Rs 3,924 crore (Rs 39.24 billion)
Growth FY11: 31%

A market leader in enterprise application software, SAP helps companies and industries run better.

Founded in 1972, SAP sales and development locations in more than 50 countries worldwide.

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Mahindra Satyam (Rank 17)

Revenue FY11: Rs 5,049 crore (Rs 50.49 billion)
Revenue FY10: Rs 5,084 crore (Rs 50.84 billion)
Growth FY 11: -1%

Mahindra Satyam is a part of the Mahindra Group, one of the top 10 industrial firms based in India.

The company offers consulting and information technology services spanning various sectors.

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Tech Mahindra (Rank 18)

Revenue FY11: Rs 4,819 crore (Rs 48.19 billion)
Revenue FY10: Rs 4,359 crore (Rs 43.59 billion)
Growth FY11: 11%

Founded in 1986, Tech Mahindra is an Information Technology service provider headquartered in Pune.

Tech Mahindra clocks revenues of over $1 billion, offering end-to-end IT solutions across the value chain to world's leading telecommunications companies.

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Microsoft India (Rank 19)

Revenue FY11: Rs 4,711 crore (Rs 47.11 billion)
Revenue FY10: Rs 3,910 crore (Rs 39.10 billion)
Growth FY11: 20%

Microsoft India, a subsidiary of US software giant Microsoft Corporation is headquartered in New Delhi. The company set up India operations in 1990.

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MphasiS (Rank 20)

Revenue FY11: Rs 4,498 crore (Rs 44.98 billion)
Revenue FY10: Rs 3,920 crore (Rs 39.20 billion)
Growth FY11: 15%

MphasiS, a unit of Hewlett-Packard is an information technology services company based in Bangalore.

It is the sixth largest IT company in India with more than 38,000 employees. The company has 29 offices in 14 countries.