LONDON  Shares of Carlyle Capital plunged on Thursday, losing most of their value, after the company said it expected its lenders to promptly take over all its assets after discussions with banks to refinance the fund failed.

Carlyle Capital, an Amsterdam-listed affiliate of the Carlyle Group, the private equity fund, said it “has not been able to reach a mutually beneficial agreement to stabilize its financing.” Its shares fell more than 87.5 percent Thursday, ending the day at 0.35 euros,. They have fallen more than 90 percent since the company’s problems became public last week.

“It has become apparent to the company that the basis on which lenders are willing to provide financing against the company’s collateral has changed so substantially that a successful refinancing is not possible,” Carlyle Capital said in a statement late Wednesday.

Carlyle Capital invested in triple-A rated mortgage debt issued by Fannie Mae and Freddie Mac, and like other investment vehicles it had leveraged its capital aggressively, borrowing $31 for every dollar of equity. As of February, it had $21.7 billion worth of assets in its investment portfolio. But as those investments lost value, creditors demanded that it put up more and more money in margin calls. A $150 million line of credit from its parent, the Carlyle Group, was not enough to keep it out of trouble as lenders demanded more collateral to back up their loans.