Why did SVB collapse?

Core Structural Causes of SVB Collapse

• SVB's primary vulnerability stemmed from a severe mismatch between its asset duration and liability liquidity, exacerbated by a highly concentrated depositor base in the VC tech startup ecosystem.
• In 2021, with near-zero interest rates, SVB invested over $90 billion in long-dated securities (primarily MBS with maturities >10 years) held as "held-to-maturity" to avoid mark-to-market adjustments.
• The bank's strategy relied on the assumption that low interest rates would persist and tech momentum would continue, a bet that failed when the Federal Reserve shifted to aggressive rate hikes in 2022.
• By the end of 2022, SVB's $91 billion held-to-maturity portfolio had a realized value of only $76 billion, creating a $15 billion unrealized loss gap that exceeded the bank's market cap for most of the fourth quarter.
• Rising interest rates increased SVB's funding costs while causing the value of its investment portfolio to decline, triggering a contraction in deposits as cash-rich tech startups became cash-burners.

The Run and Failure Mechanism

• Unrealized losses and subsequent capital fears prompted the tech deposit base to withdraw funds en masse, forcing SVB to sell securities at a significant loss.
• The bank's attempt to fill a $1.5 billion capital hole via a $2 billion capital raise failed to materialize, directly triggering the final collapse.
• On the day of failure, depositors attempted to withdraw over $40 billion, a volume SVB could not meet, leading to its seizure by the FDIC.
• The bank's announcement of a $500 million capital raise with General Atlantic and a concurrent market offering created a panic dynamic by signaling a potential $1.5 billion deficit to the market.
• The specific order of operations—announcing the capital raise before securing the funds—accelrated the run, as the announcement served as a trigger for the hyper-connected tech community to withdraw funds before other institutions.
• Psychology played a critical role: depositors feared being the "last man standing" with the FDIC involved, leading to an immediate, self-fulfilling prophecy of insolvency within hours of the announcement.

Broader Industry Context and Systemic Risks

• The collapse of SVB and Silvergate within a single week suggests crystallization of systemic risks rather than isolated failures.
• According to the FDIC's February quarterly report, the aggregate unrealized losses on securities for the insured banking system stood at $620 billion in Q4.
• Unrealized losses across the banking system in 2022 were materially higher than at any point in the previous 15 years, reaching multiples of three to six times previous peaks depending on the metric.
• While significant losses were concentrated in REIT-heavy portfolios, the FDIC data indicates these losses are not uniformly distributed across all banks.
• SVB's specific failure involved a "doubled down" risk assessment in 2022 despite changing macro conditions and deposit headwinds, which commentators label a strategic "screw-up" rather than purely a systemic inevitability.
• The speed of the depositor run highlights the unique risk of the tech ecosystem's concentration, where portfolio companies can communicate and coordinate withdrawals in near real-time.
• Analysts suggest that while alternative communication strategies could have mitigated panic, the sheer velocity of the deposit withdrawal made prevention difficult given the non-zero risk perception held by depositors.