Silicon Valley Bank
Silicon Valley Bank had $21bn in available for sale securities. The portfolio consisted of US Treasuries and Agency securities. The weighted average duration of the portfolio is 3.6 years. That would suggest a weighted average maturity of 4yrs for US Treasuries and a higher maturity for agencies of around 6yrs (taking into consideration higher coupons and prepayments). I am making some assumptions to help in my thinking here.