BT500: Toppers at a glance

A sliced-and-diced look at BT1000 tells us who created value and who destroyed it, the sector champions and the returns warriors.

The BT500 list for 2011 does not discriminate as before between companies on the basis of ownership. In previous years, public sector companies were ranked separately in a list of 50.

We considered the six months between April and September 2011 to calculate average market capitalisation.

The ranking was assigned on the basis of market capitalisation, where we compared market cap growth over the previous year's corresponding period.

We have used standalone numbers - as against consolidated results - for all companies.

We relied on Prowess, the database of the Centre for Monitoring Indian Economy. Initially, all 5,030 companies listed on the Bombay Stock Exchange were considered.

We then excluded those companies that traded for less than 20 per cent - that is 25 days - out of the total number of trading days (125) between April 1 and September 30, 2011.

That left us with 2,839 companies, of which the top 1,000 were ranked.

For most companies, the financial year ended March 2011 has been considered.