Shares of IMPAC Mortgage Holdings Inc. /zigman2/quotes/208451916/composite IMH 0.00% tumbled 16.2% in morning trading Monday, after residential mortgage originator said it was suspending all lending activity for two weeks, citing market disruptions resulting from the novel coronavirus outbreak. "Liquidity constraints are being experienced by, and de-risking mandates are being initiated by, some of the Company's capital markets counterparties that have direct access to the Federal Reserve's funding mechanisms, including certain of the company's warehouse lenders, repurchase counterparties and whole loan investors," the company said in a statement. IMPAC said the lack of communication from one of its whole loan investors has created concern among some of its other capital markets counterparties that the investor might breach its mandatory purchase commitment. Separately, the company said it has satisfied all margin calls, that it has unrestricted cash of about $80 million as of March 27 and is actively engaging with its counterparties to make sure they perform under terms of contracts. The stock has plummeted 56.7% over the past month, while the S&P 500 /zigman2/quotes/210599714/realtime SPX +0.43% has lost 12.9%.