Trading in shares of London-based Argo Blockchain (ARBK) was suspended in the U.K. and U.S. on Friday. The exact reason for the suspension was not disclosed, but it typically is due to the pending release of news.

"Should Argo be unsuccessful in completing any further financing, Argo would become cash flow negative in the near term and would need to curtail or cease operations," the company said at the time in a statement to the London Stock Exchange.