The Ambani-promoted Reliance group was the worst hit in the market carnage on Monday. The total market capitalisation of the Reliance group declined by Rs 14,128 crore [Rs 141.28 crore billion] (17 per cent) in a single day, from Rs 82,642 crore (Rs 826.42 billion) on Friday to Rs 68,514 crore (Rs 685.14 billion) on Monday. 
 
Within the Reliance group, Reliance Industries' total market capitalisation declined by Rs 10,222 crore (Rs 102.22 billion) to Rs 56,357 crore (Rs 563.57 billion) from Rs 66,579 crore (Rs 665.79 billion) on Friday. 
 
Reliance Energy, also a group company, was the largest loser in percentage terms; its market capitalisation tumbled by almost 26 per cent, or Rs 2,588 crore (Rs 25.88 billion) to Rs 7,541 crore (Rs 75.41 billion) from Rs 10,129 crore (Rs 101.29 billion) on Friday. 
 
The Tatas were the second largest group to lose market capitalisation; the market capitalisation of the group fell by Rs 5,513 crore (Rs 55.13 billion) to Rs 43,461 crore (Rs 434.61 billion). 

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Within the group, the market capitalisation of Tata Motors, Tata Power and Tata Steel alone dropped by more than Rs 1,000 crore (Rs 10 billion) in a single day. 
 
The Tatas were followed by ITC [a market capitalisation loss of Rs 2,188 crore (Rs 21.88 billion) to Rs 21,211 crore (Rs 212.11 billion)], the Bharti group [market capitalisation loss of Rs 1,548 crore (Rs 15.48 billion) to Rs 25,127 crore (Rs 251.27 billion)] and the A V Birla group [market capitalisation loss of Rs 1,058 crore (Rs 10.58 billion) to Rs 19,057 crore (Rs 190.57 billion)]. 
 
The Bajajs and the Shahs (Bajaj Auto and Mukand Iron and Steel), the Munjals (Hero group), Shiv Nadar (HCL Technologies), Anil Agarwal (Sterlite group), O P Jindal (Jindal group) are the other promoters whose companies' market capitalisation declined by more than Rs 500 crore (Rs 5 billion) in single day. 
 
In the last 15 trading days from April 23, the Reliance group's total market capitalisation declined by Rs 30,426 crore (Rs 304.26 billion) from Rs 98,940 crore (Rs 989.40 billion). 
 
During the period, the total market capitalisation of the Tata group declined by Rs 18,734 crore (Rs 187.34 billion), that of the Bharti group by Rs 7,746 crore (Rs 77.46 billion) and that of the A V Birla by Rs 6,131 crore (Rs 61.31 billion). 
 
During the same period, the market capitalisation of publicly listed Munjal group companies, of O P Jindal companies, of Shiv Nadar-promoted companies, of the Hinduja group companies in India, of the Kalyani group (Bharat Forge, Kalyani Steel and other companies) and of the TVS Iyenger group declined by more than Rs 1,000 crore (Rs 10 billion) each.