The combined market valuation of the top-10 domestic firms eroded sharply by Rs 4.48 lakh crore last week, in tandem with a steep decline in equities, with banking majors State Bank of India and HDFC Bank taking the biggest hit. The combined market valuation of the top-10 domestic firms eroded sharply by Rs 4.48 lakh crore last week, in tandem with a steep decline in equities, with banking majors State Bank of India and HDFC Bank taking the biggest hit. by Soban News (international And National News)