Axis Bank shares plunged 4 percent on Monday, emerging as the top loser on both the Nifty 50 and Bank Nifty following the private sector lender's mixed second-quarter earnings. While brokerages remained broadly positive on the stock's outlook, concerns over pressure on margins, elevated operating expenses and a rising loan-to-deposit ratio weighed on sentiment. Axis Bank stock fell to Rs 1,238 in morning trade, extending its year-to-date decline to 3 percent, compared with an 11.5 percent fall in the Nifty 50.