Shares of leading private sector banks, including HDFC Bank, Axis Bank, and Kotak Mahindra Bank, came under selling pressure following the announcement of their June quarter financial results, with investors focusing on margin performance despite broadly stable earnings.

HDFC Bank declined after reporting a 5% year-on-year increase in net profit, while advances and deposits grew 15.4% and 13.3%, respectively. However, the bank's net interest margin (NIM) stood at 3.26%, remaining below the levels seen prior to its merger with HDFC Ltd. The lower margin, coupled with softer-than-expected net interest income and fee income, led several brokerages to adopt a cautious view on the stock.

According to analysts, HDFC Bank's increased focus on faster-growing corporate loans supported business growth but weighed on lending margins. Some brokerages also revised their earnings estimates marginally lower, citing the weaker margin profile.

Axis Bank also witnessed a sharp decline despite reporting results largely in line with market expectations. Analysts highlighted softer first-quarter margins and indicated that elevated funding costs and wholesale loan pricing continue to pressure profitability. Kotak Mahindra Bank faced similar concerns, with investors reacting negatively to margin trends despite operational performance meeting expectations.

Market analysts expect net interest margins across private sector banks to remain under pressure during the September quarter before gradually recovering as deposit repricing stabilizes and funding costs begin to moderate.

The earnings season has reinforced investor focus on margin sustainability, with banks expected to balance growth in corporate lending while protecting profitability in a competitive interest rate environment.