In a pattern reminiscent of the fall of US lender First Republic, US PacWest Bancorp has returned to the news, after it saw its stock price plummet on revealing that deposit outflows had resumed during the first week of May.

The stock fell by as much as 33% in opening trading, pulling down other regional bank stocks such as Western Alliance Bancorp, KeyCorp and Zions Bancorp.

In a securities filing Thursday, PacWest revealed that during the week of May 5th, deposits at the lender declined by almost 10%, after reports emerged saying the bank was seeking out strategic options. The filing noted the bank had been able to fund those withdrawals using available liquidity. Currently the bank has $15 billion of liquidity available compared to $5.2 billion in uninsured deposits, according to the filing.

Last week the bank had stated that it had not been experiencing any “out of the ordinary deposit flows,” and that since the end of March, total deposits had increased.

PacWest’s total deposits fell 16.9% during the first quarter, with the bank noting that it would reshape its balance sheet using strategic asset sales.

So far this year, PacWest shares have declined over 80%, losing 40% just this month. Last week its stock plummeted to a record low, following the announcement it was in talks with potential partners and investors.

The California-based lender is just the latest bank to find itself suffering in the worst crisis to hit the US financial sector since 2008. Following the collapse of several regional lenders, concerns over the stability of mid-sized regional lenders has been growing as skittish investors have begun dumping the stocks in spite of regulator statements that the banking sector is structurally sound.