Not nearly the same kind of losses, I don't think. The drop in value of bond-like investments is heavily affected not just by the change in interest rates but also the duration: long duration bonds drop much more heavily because the total amount of interest people now expect over their life is much higher. The interest rates on three-month Treasury bills has barely increased over the last few months (which is obviously the longest they could've been holding any for), and then taking into account the duration and the interest they're receiving they shouldn't be looking at mark-to-market losses at all really.