Shares of AU Small Finance Bank today tumbled over 7 percent on the NSE on Monday, October 26, despite the lender reporting a 53 percent year-on-year surge for the second quarter ended September 30, 2026 on the back of improvement in interest income. While the lender posted strong earnings growth in the Q2FY27, brokerages flagged concerns over pressures on net interest margin (NIM), a sequential increase in loan slippages and potential risks to insurance-related income.