There are 42 new companies in the 2012 list which were not listed last year.
The financial results of companies for periods other than 12 months have been annualised. The cut-off date is for the year ended June 30, 2012, says The Economic Times.
Find our more about India's 30 biggest companies...
Indian Oil Corporation
Revenue: Rs 4,16,816.20 crore (Rs 4.16 trillion)
PAT: Rs 4,225.98 crore (Rs 42.25 billion)
Assets: Rs 1,43,043.00 crore (Rs 1.43 trillion)
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The 30 biggest companies in India
Reliance Industries
Revenue: Rs 3,64,695 crore (Rs 3.64 billion)
PAT: Rs 19,724 crore (Rs 197.24 billion)
Assets: Rs 2,63,113 crore (Rs 2.63 trillion)
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The 30 biggest companies in India
Bharat Petroleum Corporation
Revenue: Rs 2,13,596.23 crore (Rs 2.13 trillion)
PAT: Rs 780.83 crore (Rs 7.80 billion)
Assets: Rs 47,611.61 crore (Rs 476.11 billion)
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The 30 biggest companies in India
Hindustan Petroleum Corporation
Revenue: Rs 1,86,327.55 crore (Rs 1.86 trillion)
PAT: Rs 174.65 crore (Rs 1.74 billion)
Assets: Rs 59,350.26 crore (Rs 593.50 billion)
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The 30 biggest companies in India
State Bank of India
Revenue: Rs 1,77,032.83 crore (Rs 1.77 trillion)
PAT: Rs 15,343.10 crore (Rs 153.43 billion)
Assets: Rs 18,32392.49 crore (Rs 18.32 trillion)
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The 30 biggest companies in India
Image: Tata Nano plant.Photographs: Reuters.
Tata Motors
Revenue: Rs 1,66,316.27 crore (Rs 1.66 trillion)
PAT: Rs 13,516.50 crore (Rs 135.16 billion)
Assets: Rs 89,135.98 (Rs 891.35 billion)
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The 30 biggest companies in India
Image: An ONGC worker.Photographs: Reuters.
Oil and Natural Gas Corporation
Revenue: Rs 1,54,147.27 crore (Rs 1.54 trillion)
PAT: Rs 28,143.62 crore (Rs 281.43 billion)
Assets: Rs 1,79,859.83 crore (Rs 1.79 trillion)
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The 30 biggest companies in India
Image: Tata Steel.Tata Steel
Revenue: Rs 1,37,834.66 crore (Rs 1.37 trillion)
PAT: Rs 5,389.77 crore (Rs 53.89 billion)
Assets: Rs 1,11,746.96 crore (Rs 1.11 trillion)
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The 30 biggest companies in India
Photographs: Reuters.
Coal India
Revenue: Rs 82,641.61 crore (Rs 826.41 billion)
PAT: Rs 14,788.20 crore (Rs 147.88 billion)
Assets: Rs 72,952.31 crore (Rs 729.52 billion)
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The 30 biggest companies in India
Image: Hindalco project.Hindalco Industries
Revenue: Rs 81,604.44 crore (Rs 816.04 billion)
PAT: Rs 3,396.95 crore (Rs 33.96 billion)
Assets: Rs 81,385.63 crore (Rs 813.85 billion)
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The 30 biggest companies in India
Photographs: Reuters.
Bharti Airtel
Revenue: Rs 71,770.10 crore (Rs 71.770 billion)
PAT: Rs 4,256.80 crore (Rs 42.56 billion)
Assets: Rs 1,18,412.80 crore (Rs 1.18 trillion)
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The 30 biggest companies in India
Image: NTPC.NTPC
Revenue: Rs 69,036 crore (Rs 690.36 billion)
PAT: Rs 9,814.66 crore (Rs 98.14 billion)
Assets: Rs 1,38,647.10 crore (Rs 1.38 trillion)
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The 30 biggest companies in India
ICICI Bank
Revenue: Rs 66,658.28 crore (Rs 666.58 billion)
PAT: Rs 7,642.93 crore (Rs 76.42 billion)
Assets: Rs 6,04,629.37 crore (Rs 6.04 trillion)
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The 30 biggest companies in India
Image: Anil Manibhai Naik, chief executive officer and managing director of the Indian engineering and construction conglomerate, Larsen and Toubro.Photographs: Savita Kirloskar/Reuters.
Larsen & Toubro
Revenue: Rs 65,198.85 crore (Rs 651.98 billion)
PAT: Rs 4,702.36 crore (Rs 47.02 billion)
Assets: Rs 84,079.70 crore (Rs 840.79 billion)
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The 30 biggest companies in India
Mahindra & Mahindra
Revenue: Rs 59,853.22 crore (Rs 598.53 billion)
PAT: Rs 3,126.66 crore (Rs 31.26 billion)
Assets: Rs 48,350.39 crore (Rs 483. 50 billion)
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The 30 biggest companies in India
Image: Essar House.Essar Oil
Revenue: Rs 59,031 crore (Rs 590.31 billion)
Loss: Rs 4,199.00 crore (Rs 41.99 billion)
Assets: Rs 15,531.00 crore (Rs 155.31 billion)
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The 30 biggest companies in India
Mangalore Refinery and Petrochemicals
Revenue: Rs 54,117.66 crore (Rs 541.17 billion)
PAT: Rs 908.58 crore (Rs 9.08 billion)
Assets: Rs 13,011.79 crore (Rs 130.11 billion)
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The 30 biggest companies in India
Image: Bharat Heavy Electricals .Bharat Heavy Electricals
Revenue: Rs 49,612.25 crore (Rs 496.12 billion)
PAT: Rs 7,087.44 crore (Rs 70.87 billion)
Assets: Rs 38,424.33 crore (Rs 384.24 billion)
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The 30 biggest companies in India
Image: TCS.Tata Consultancy Services
Revenue: Rs 49,322.00 crore (Rs 493.22 billion)
PAT: 10,413.49 crore (Rs 104.13 billion)
Assets: Rs 30,767.21 crore (Rs 307.67 billion)
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The 30 biggest companies in India
Steel Authority of India (SAIL)
Revenue: Rs 48,773.96 crore (Rs 487.73 billion)
PAT: Rs 3,593.09 crore (Rs 35.93 billion)
Assets: Rs 62,346.19 crore (Rs 623.46 billion)
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The 30 biggest companies in India
GAIL (India)
Revenue: Rs 44,695.74 crore (Rs 446.95 billion)
PAT: Rs 4,443.61 crore (Rs 44.43 billion)
Assets: Rs 38,103.54 crore (Rs 381.03 billion)
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The 30 biggest companies in India
Image: Sterlite Industries.Sterlite Industries (India)
Revenue: Rs 44,342.15 crore (Rs 443.42 billion)
PAT: Rs 4,827.92 crore (Rs 48.27 billion)
Assets: Rs 75,414.94 crore (Rs 754.14 billion)
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The 30 biggest companies in India
Image: Punjab National Bank.Punjab National Bank
Revenue: Rs 41,686.82 crore (Rs 416.86 billion)
PAT: Rs 5,025.46 crore (Rs 50.25 billion)
Assets: Rs 4,70,473.87 crore (Rs 4.70 trillion)
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The 30 biggest companies in India
Chennai Petroleum Corporation
Revenue: Rs 40,928.92 crore (Rs 409.28 billion)
PAT: Rs 61.83 crore (Rs 618.3 million)
Assets: Rs 7,497.11 crore (Rs 74.97 billion)
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The 30 biggest companies in India
Image: Wipro campus.Photographs: Reuters.
Wipro
Revenue: Rs 38,456.30 crore (Rs 384.56 billion)
PAT: Rs 5,604.50 crore (Rs 56.04 billion)
Assets: Rs 33,386.50 crore (Rs 333.86 billion)
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The 30 biggest companies in India
Image: A worker adjusts the windscreen wipers of a parked car at a Maruti Suzuki stockyard on the outskirts of Ahmedabad.Photographs: Amit Dave/Reuters.
Maruti Suzuki India
Revenue: Rs 36,934.20 crore (Rs 369.34 billion)
PAT: Rs 1,681 crore (Rs 16.81 billion)
Assets: Rs 17,366.40 crore (Rs 173.66 billion)
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The 30 biggest companies in India
Image: Infosys campus.Infosys
Revenue: Rs 35,638 crore (Rs 356.38 billion)
PAT: Rs 8,332 crore (Rs 83.32 billion)
Assets: Rs 31,455 crore (Rs 314.55 billion)
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The 30 biggest companies in India
Image: Bank of Baroda.Bank of Baroda
Revenue: Rs 34,588.91 crore (Rs 345.88 billion)
PAT: Rs 5,248.57 crore (Rs 52.48 billion)
Assets: Rs 4,57,412.01 crore (Rs 4.57 trillion)
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The 30 biggest companies in India
JSW Steel
Revenue: Rs 34,444.90 crore (Rs 344.44 billion)
PAT: Rs 537.68 crore (Rs 5.37 billion)
Assets: Rs 38,187.57 crore (Rs 381.87 billion)
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The 30 biggest companies in India
Canara Bank
Revenue: Rs 33,920.15 crore (Rs 339.20 billion)
PAT: Rs 3,341.69 crore (Rs 33.41 billion)
Assets: Rs 3,79,403.55 crore (Rs 3.79 trillion)
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