* While the overall sales rankings have been made on the basis of the available universe of private and public sector quoted companies, the other rankings (assets, net worth, gross profit, market capitalisation, composite etc) are restricted to the FE 500.
* Every attempt has been made to make all figures comparable and compatible with our definitions. All the related data are taken from the respective consolidated and standalone balance sheets only.
* Eleven companies changed their accounting period during 2009-10. They are 3M India, Essel Propack, Eicher Motors, Garden Silk Mills, Ispat Industries, Jindal Saw , JK Tyres & Industries, Mphasis, Sakthi Sugars, Sujana Towers and Wockhardt.
* Wherever accounting periods have been less or more than 12 months, sales, operating profit, gross profits, PBT, PAT, and retained profit figures have been annualised. The only exception from this general rule is net worth and assets.
* Some big companies could not be included in the study because balance sheets and profit and loss accounts were not available for two years. These companies are: Lakshmi Energy & Foods, Dishman Pharma, NIIT Tech, Mahindra Satyam, Hinduja Global, D B Realty and Core Projects.
* Some companies changed their names during the year. These are, with the new names in brackets: Coromandel Fertilisers (Coromandel International), Welspun Guj.Stahl Rohern (Welspun Corporation), Dalmia Cement Bharat (Dalmia Bharat Sugar and Industries), Dhunseri Tea & Industries (Dhunseri Petrochem & Tea Industries), JSL Ltd (JSL Stainless), Savita Chemicals (Savita Oil Technologies), Spice Mobile (Spice Mobility), Subhash Projects & Marketing (SPML Infra ). ICI Ltd ( Akzo Noble) and Tata Tea (Tata Global Beverages).
* Industry-wise groupings, have been done on the basis of the standard industrial clasification of all economic activities adopted by the Government of India. A company with more than one activity is classified within that industry from which it derives more than a half of its sales or main income.
* Mergers and acquisitions have also become major factors in corporate growth during 2009-10. Some companies amalgamated with others during the year. These are, with names in brackets: BASF India (Ciba India, Ciba Research (I) and Diamond Dye-Chem), Gammon India (Associated Transrail Structures), Reliance Industries (Reliance Petroleum), United Spirits (Shaw Wallace & Co, Primo Distributors, Balaji Distilleries), Jaiprakash Associates (Jaypee Hotels, Gujarat Anjan Cements, Jaypee