PacWest's Shares Slump Despite Efforts to Increase Borrowing Capacity.

PacWest Bancorp's shares slumped 25% premarket as the bank pledged additional assets as collateral to increase its borrowing capacity under the US Federal Reserve's discount window and said it had $15 billion of immediately available liquidity. The lender pledged an additional $5.1 billion of its loans to the central bank on Wednesday, which PacWest said resulted in an additional borrowing capacity of $3.9 billion. The bank pledged additional assets as collateral for borrowings to increase its liquidity position for potential deposit outflows.