Custody Banks Like State Street and BNY Mellon Are Quietly Near Record Highs. Here's What's Driving the Rally.

Custody banks are crushing the broader banking sector in 2024, with State Street (STT), BNY Mellon (BK), and Northern Trust (NTRS) posting year-to-date gains of 26-32%. The trio trades near record highs, fueled by a combination of rising assets under custody, heightened trading activity during recent market volatility, and expanded net interest income from reinvesting client deposits at higher rates.

BNY Mellon reported record first-quarter revenue of $5.4 billion, with net income surging 36% year-over-year. The performance was driven by deposit inflows and increases in fee income, underscoring the business model's leverage to both market activity and interest rate dynamics.

The custody bank structure benefits from multiple revenue streams: fee income scales with assets under custody and transaction volumes, while net interest margins expand when banks reinvest client deposits into higher-yielding securities. This dual tailwind has separated custody banks from regional and money-center peers struggling with loan quality and deposit flight concerns.