After a sharp fall in the share prices of HDFC Bank and other private sector lenders in the past three days, the BFSI (banking, financial services and insurance) sector weighting in the Nifty50 has slipped to a seven-year low of 32.03 per cent, down from nearly 36.6 per cent at the end of March 2023 and 34.5 per cent at the end of December 2023.