Regional Bank Crisis 2023

In March 2023, Silicon Valley Bank failed after a deposit run triggered by losses on its long-duration Treasury and agency-MBS portfolio — paper losses that became real losses when the bank was forced to sell into the rate-hike-driven repricing to meet withdrawals. Signature Bank failed days later; First Republic was ultimately taken over by JPMorgan in May. The KBW Regional Bank Index fell roughly 30% over the episode. The US Treasury, Federal Reserve and FDIC provided emergency facilities (BTFP, expanded discount window) and explicitly backstopped uninsured deposits at the failed banks. Outside the bank sector, the broad market reaction was modest and brief: the S&P 500 finished the year up approximately 26%, led almost entirely by mega-cap technology benefiting from the AI narrative.

• Mega-cap technology — the largest seven US tech names returned the bulk of the index's 2023 gain.
• Money-market funds and short-dated Treasuries — saw record inflows as depositors moved from low-yielding bank deposits.
• Gold rallied through the episode and into year-end as a hedge against systemic banking concerns.
• Global systemically-important banks (the largest US and Canadian banks) gained deposits from the regionals' losses.
• Investors who did not panic-sell during March: by year-end the S&P 500 was substantially higher.

• Regional bank equity and preferred securities — several institutions were wiped out or absorbed at distressed prices.
• Long-duration fixed-income holdings on bank balance sheets — the proximate cause of the crisis.
• AT1 / CoCo bonds globally, particularly Credit Suisse AT1s which were written down to zero in the UBS takeover.
• Commercial real estate exposure on regional bank balance sheets, which became a slower-burning concern through the rest of 2023.

• Mark-to-market losses become mark-to-realised when funding withdraws. The held-to-maturity accounting bucket protects reported earnings but not actual solvency in a deposit run.
• Deposit insurance limits matter more than they appear in normal times. The failed banks had unusually high concentrations of uninsured deposits, which made the run faster.
• Sector-specific stresses do not always become systemic. Equity investors who acted on "banking crisis" headlines in March would have missed one of the better calendar years for the broad index.
• Concentration of leadership reappeared in 2023 — index returns were almost entirely driven by a small number of mega-cap names, echoing prior late-cycle dynamics.