Earlier quoted context omitted.
The overinvestment into US debt put them at extreme risk for interest rate related devaluation, which is exactly what happened. Even if they were going to go heavy with US debt, investment professionals normally use bond laddering for with fixed income funds to reduce that interest rate risk to the portfolio. They did not even do basic laddering!
Can anyone provide a link that carefully outlines this? Eg did they just recently buy a ton of ten year bonds? That would sound nuts as everyone knows rates are rising right now. Would love to see details.
The mitigation to interest rate risk is by buying them spaced out so principal returns are being re-invested at changing rates, and you are never tied to a specific rate. https://www.investopedia.com/terms/b/bondladder.asp
Here you see https://www.cnn.com/2023/03/11/business/svb-bank-collapse-ex... their average yield at 1.79%