U.S. Banks Are Sitting on $306 Billion in Unrealized Losses

American banks are collectively carrying roughly $306 billion in unrealized losses on their balance sheets, a figure that revives concerns about the financial stability risks that rattled markets during the regional banking crisis of 2023.

Unrealized losses of this scale typically reflect the mark-to-market impact of higher interest rates on long-duration bond portfolios — the same dynamic that brought down Silicon Valley Bank. As long as rates stay elevated, the gap between book value and market value remains a latent pressure point for institutions that may need to raise liquidity.

For macro watchers, the number is a reminder that the Fed's rate path carries balance-sheet consequences well beyond the cost of new borrowing.