Explained: Why Bandhan Bank shares tanked despite a steady quarterB

Bandhan Bank’s June quarter numbers weren’t bad. In fact, on most operating parameters, they were largely in line with expectations. Yet the stock plunged 14%. The reason lay not in what the bank reported, but in what it said about the road ahead.

The lender warned that its net interest margin (NIM) would soften over the next two quarters, a statement that immediately changed the market’s earnings expectations.For banks, NIM is the single most important profitability metric. It measures the spread between the interest earned on loans and the interest paid on deposits.

When that spread narrows, profits inevitably come under pressure.The squeeze is a direct consequence of the interest rate cycle. As the RBI cuts policy rates, banks have to lower lending rates on floating-rate loans almost immediately. Deposit costs, however, tend to adjust much more slowly. Banks are still paying relatively high rates to attract deposits in an intensely competitive market.

The result is a temporary but painful compression in margins.Investors had hoped the worst of this pressure was already behind the sector. Bandhan Bank’s guidance suggested otherwise. By indicating that margins would remain under strain for at least another two quarters, the bank effectively signalled that earnings recovery would take longer than the market had priced in.

That is why the stock reacted so sharply. Equity markets are forward-looking. A modest downgrade to future profitability often has a far bigger impact on valuations than a quarter of respectable earnings.The bigger picture, however, has not changed dramatically. If deposit rates begin to ease over the coming quarters and credit demand remains healthy, margins should gradually recover.

Until then, investors are likely to treat banks that rely on a healthy interest spread with greater caution.In the end, Bandhan Bank’s sharp fall was less a verdict on its June quarter and more a reflection of the market’s disappointment with its outlook. That’s often how banking stocks behave: guidance matters as much as, if not more than, the numbers themselves.