What really happened

Silicon Valley Bank was 40 years old and considered America’s tech bank. It banked roughly 50% of all US VC-funded tech startups, numerous crypto firms, Napa wine producers, and thousands of tech employees as private clients. In the 2020–2021 tech boom, deposits exploded — from $61B (2019) to $189B (end of 2021). Tech firms closing series rounds at absurd valuations parked the cash at SVB.

The bank run resulted from a seemingly conservative investment decision: in 2021 SVB invested about $80 billion of its deposits in long-dated US Treasuries and mortgage-backed securities — at the historically low yields of the time. The plan: interest costs at the bottom, yields locked in. Not factored in: if the Fed hikes rates aggressively in 2022, a 10-year Treasury loses about 30% of its market value on a 5% rate move. SVB sat on roughly $15 billion of unrealized losses — larger than its entire equity capital.

As long as the bonds were held to maturity, that was a balance-sheet issue, not a cash-flow problem. But as tech firms in 2022/2023 raised fewer funding rounds and burned through cash for operating expenses, withdrawals rose. On March 8, 2023 SVB sold $21B of bonds at a $1.8B loss and announced a capital raise. This triggered panic. VC firms like Founders Fund and Y Combinator advised their portfolio companies to withdraw immediately. Within 24 hours, customers pulled $42 billion — over a quarter of the balance sheet. On March 10, 2023 the FDIC closed the bank. First weekend: no deposit insurance above $250,000 — which for tech firms with millions per account became a systemic problem. The US government guaranteed all deposits on March 12 to prevent a chain reaction.

The warning signs everyone ignored

SVB’s balance-sheet risk was visible publicly — the unrealized losses on the HTM (Held to Maturity) portfolio were disclosed in every quarterly report. Short sellers like Bill Martin of Raging Capital had publicly flagged it from January 2023. The problem: under US accounting rules, banks need not deduct HTM losses from equity as long as they hold the bonds. The balance sheet looked healthy when it was not operationally.

SVB also had no Chief Risk Officer from April 2022 to January 2023 — almost the entire rate-hike cycle. A bank without a CRO during the biggest monetary policy turn in 40 years is a massive governance gap. The Federal Reserve (San Francisco) did conduct stress tests but failed to flag the asset-liability mismatch as a critical issue.

What investors can learn today

First: concentration risk is real. SVB had 50% tech-VC clients and 50% tech-tech clients. In a tech-sector stress, deposits and lending demand drop in parallel. Second: HTM accounting rules obscure real risk. Anyone holding a bank stock must check the mark-to-market values of the bond portfolio, not just the book values. Third: Twitter-era bank runs are 100x faster than 2008. SVB collapsed in 36 hours — Lehman took 6 months. When trust cracks, liquidity matters in seconds and minutes.