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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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)