Wall Street’s Quiet Warning: AI Could Drain Bank Deposits

Bank stocks just had their worst month since the March 2025 selloff, and it isn’t the usual suspect — credit losses or a recession scare — driving the decline. The Invesco KBW Bank ETF (KBWB) is down 5.7% in September, its steepest monthly drop in over a year, with Goldman Sachs and Bank of America both off more than 8% and Morgan Stanley down nearly 8%. Brokerages have been hit even harder: Charles Schwab has fallen 9.8% this month and Interactive Brokers 8.3%.

Rising Treasury yields explain part of the selloff — higher rates squeeze loan growth and bank margins. But Apollo Global Management’s chief economist Torsten Slok has flagged a more structural threat that long-term bank shareholders should understand: what he calls an “agentic bank run.” His thesis is simple and unsettling. AI assistants like Meta’s newly launched Muse are increasingly capable of automatically sweeping idle cash into higher-yielding accounts. Fintech deposit products from firms like SoFi Technologies currently pay around 4.5% APY, compared to a national average of just 0.1% on traditional checking accounts. If millions of households let an AI agent quietly optimize their cash the way a robo-advisor optimizes a portfolio, the cheap deposits that banks rely on to fund loans could erode gradually, not all at once, but persistently.

Slok is careful to note there’s no sign of an actual bank run underway. This isn’t a 2023 Silicon Valley Bank-style crisis. It’s a slower-moving structural risk: a 44x gap between what SoFi pays and what the national average checking account yields is the kind of arbitrage that automation eventually closes. For patient investors holding traditional bank stocks for their dividends, the calculus on “cheap deposits as a durable moat” may need updating — deposit costs could creep higher over time even without a crisis, compressing the net interest margins that have underpinned bank profitability and payout growth for decades.

So what for long-term investors? This is a moat question, not a solvency question. Regional and money-center banks that have historically funded lending with near-free checking deposits may see that advantage erode as agentic AI makes yield-shopping frictionless for ordinary savers. Investors holding bank stocks for dividends should watch deposit cost trends and fee income diversification more closely than usual — and recognize that fintechs offering transparent, high-yield cash products may be quietly gaining a durable structural edge over legacy banks that are slower to compete on rate.