LONDON -- Marconi Corporation plc (London: MONI) announces that its equity will begin trading on the NASDAQ National Market, in the form of American Depository Receipts (ADRs) under the ticker symbol MRCIY, when trading opens at 09:30 hours (New York time) today. The new listing fulfils a commitment the company made to its new shareholders as part of its financial restructuring. Each Marconi Corporation ADR will represent two Marconi Corporation plc ordinary shares.

Marconi Corporation ADRs have traded on the over-the-counter market under the ticker symbol MRCIY since May 2003.

Marconi Corp. plc