Don Cruickshank, Chairman of London Stock Exchange plc, said: "During recent weeks, the OM share price has dropped by more than 20 per cent. In the meanwhile, OM has failed to address the serious concerns we have raised about their technology, financial track record and ownership control and governance.
"OM's suggestion that London Stock Exchange has sought to stifle debate on the 4.9 per cent shareholding limit is absurd. We have called an EGM for Thursday 19 October specifically to allow our shareholders to consider this issue.
"The revised OM offer provides London Stock Exchange shareholders with a choice between two unattractive alternatives: either even more shares of uncertain value or cash and even less influence. We will be writing to shareholders in due course with our further reasons for rejecting this bid."