"SVB had benefited from from more than a decade of “zero money” interest rates as billions poured into the bank via tech venture capital. Looking for some kind of a return, it put the money into long-term US treasury bonds. But when interest rates started sharply rising last year, and depositors demanded higher returns, the bank was forced to sell some of those bonds at a loss. When news of that hit social media, tech investors panicked, triggering a classic bank run. From there, it took 36 hours for the second-biggest bank failure in US history to materialize."
Edward Helmore
The Guardian
https://www.google.com/amp/s/amp.theguardian.com/business/2023/mar/17/why-silicon-valley-bank-collapsed-svb-fail