The combined market valuation of five of the top-10 most-valued firms eroded by ₹1 lakh crore last week, with HDFC Bank taking the biggest hit.Last week, the BSE benchmark Sensex dipped 30.96 points, or 0.04%, and the NSE Nifty slipped 36.6 points, or 0.15%.“Markets ended the week on a largely flat note with a negative bias, reflecting underlying caution among participants. The tone remained positive during the first three sessions; however, a sharp decline on Thursday [March 19, 2026] erased th...