Customers are chasing higher-rate products. That’s bad news for banks like HSBC.

HSBC Holdings shares fell as much as 7% on Tuesday after the lender disclosed that customers are increasingly shifting deposits into higher-rate products. The move reflects a broader pattern in a higher-interest-rate environment: savers are becoming more rate-sensitive, moving funds from lower-yielding accounts into products that pay more. For a bank, that shift can raise funding costs, since deposits become more expensive to retain.

The market reaction underscores how closely investors are watching deposit behavior as a driver of bank profitability. Funding costs sit at the core of lending economics, so changes in where customers keep their cash can influence net interest margins and earnings outlooks. HSBC's disclosure offered a concrete signal that this dynamic is playing out at a major institution, not just in theory.

What to watch: whether this deposit migration continues or stabilizes in coming quarters, and how HSBC and peers adjust product pricing and funding strategies in response. Broader rate expectations and competitive pressure from higher-yield offerings will also shape how quickly deposit costs rise across the sector.