New Delhi, May 11 -- Eight of India's ten most valuable companies collectively lost Rs.1.60 lakh crore in market value last week, with Reliance Industries suffering the largest decline amid a broader market downturn.

The BSE benchmark index fell by 1,047.52 points, or 1.30%, during the week.

Reliance Industries, HDFC Bank, Tata Consultancy Services (TCS), Bharti Airtel, ICICI Bank, State Bank of India, Bajaj Finance, and ITC all saw declines in their market capitalisations. In contrast, Infosys and Hindustan Unilever registered gains.

Reliance Industries' valuation plunged by Rs.59,799.34 crore to Rs.18.64 lakh crore.

ICICI Bank's mcap fell Rs.30,185.36 crore to Rs.9.90 lakh crore, while HDFC Bank's dropped Rs.27,062.52 crore to Rs.14...