HDFC Bank, another heavyweight, wasn't spared either, with its valuation dropping by ₹ 72,919.58 crore to ₹ 12,64,267.35 crore. Bharti Airtel and ICICI Bank also felt the heat, losing ₹ 53,800.31 crore and ₹ 47,461.13 crore in market cap, respectively, as per the report.

The Sensex dropped about 1,600 points from day’s high, while the Nifty looked poised to test the sub-25,000 level in a brisk selling on October 4 afternoon amid fears Israel was planning a significant retaliation following Iran’s missile attacks,

Infosys was the only stock in Top 10 to close in green last week after its mcap jumped by Rs 4,629.64 crore to record Rs 7,96,527.08 crore in valuation

Nine of the top-10 most valued firms together lost a whopping Rs 4,74,906.18 crore in market valuation last week, with Reliance Industries and HDFC Bank taking the steepest hit, in line with weak trends in equities.

HDFC Bank, Indias largest private lender, added over Rs 1.2 lakh crore in deposits in the September quarter, growing its deposit base by 15.1% to Rs 25 lakh crore. CASA deposits grew by 8%, while time deposits increased by 19.

Reliance Industries retained the title of the most-valued firm, followed by TCS, HDFC Bank, Bharti Airtel, ICICI Bank, Infosys, State Bank of India, Hindustan Unilever, ITC, and LIC.

Nine of India's top 10 most valued firms collectively lost a staggering Rs 4,74,906.18 crore in market capitalization last week as Reliance Industries and HDFC Bank have taken the biggest blows in this turbulent equity market.

Nine of the top-10 most valued firms together lost a whopping Rs 4,74,906.18 crore in market valuation last week, with Reliance Industries and HDFC Bank taking the steepest hit, in line with weak trends in equities.