Silicon Valley Bank
Silicon Valley Bank Duration Risk Collapse
Estimated impact: $209B in assets seized; depositor panic across regional banks
SVB invested heavily in long-duration government bonds and mortgage-backed securities during the zero-interest-rate era. When the Fed rapidly raised rates in 2022-2023, SVB's bond portfolio lost $17 billion in unrealized value. A poorly communicated capital raise triggered a bank run, with $42 billion withdrawn in a single day. The FDIC seized the bank on March 10, 2023 — the second-largest bank failure in U.S. history.
Decision context
Whether to maintain a heavily concentrated portfolio of long-duration fixed-income securities or hedge interest rate risk through diversification and derivatives, given the Fed's signaled shift toward tightening monetary policy.
The analysis below was produced from the pre-decision document only — no hindsight. This is what the platform would have surfaced if it had been running in 2022.
“The current held-to-maturity portfolio totals $91.3 billion with a weighted average duration of 6.2 years, yielding 1.56% on a blended basis. Deposit concentration remains favorable with 97% of balances above FDIC insurance thresholds, reflecting the strength of our venture and innovation banking franchise. The committee recommends maintaining the current asset allocation given the inverted yield curve dynamics and anticipated rate stabilization in Q3 2023.”
Source: SVB Asset-Liability Committee (ALCO) quarterly presentation to the board
Red flags detectable at decision time
- Massive duration mismatch: $91B in HTM securities averaging 6.2 years against short-duration, flight-risk deposits
- 97% uninsured deposits — representing extreme concentration risk and bank-run vulnerability
- No interest rate hedges in place since Q1 2021 despite Fed signaling aggressive tightening
- CFO position vacant for 8 months during the most significant rate environment shift in decades
Cognitive biases the platform would have flagged
Hypothetical analysis
A decision intelligence platform would have flagged the duration mismatch as a critical risk, modeling the mark-to-market loss exposure under a 300-400bps rate increase scenario. The 97% uninsured deposit concentration would have triggered an immediate liquidity stress alert — any loss of confidence could produce withdrawal rates far exceeding historical norms. The vacant CFO role during a period requiring active balance sheet management would have been surfaced as a governance gap amplifying execution risk.
Biases present in the decision
Toxic combinations
- Status Quo Lock
- Echo Chamber
Reference class base rates
Across all 146 curated case studies in our library:
Lessons learned
- Anchoring to a decade of zero interest rates created a recency bias that made SVB leadership unable to price in the possibility of rapid rate increases.
- Concentrating 55% of assets in long-duration bonds without hedging is a bet, not a strategy — and the board failed to recognize it as such.
- The communication failure during the capital raise demonstrates that even correct decisions (raising capital) can be fatal if execution ignores market psychology.
Source: FDIC press release (March 10, 2023); Federal Reserve Board review of SVB supervision (April 2023); SVB Financial Group 10-K (2022) (Post Mortem)
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