Bourse owner and operator OMX said on Wednesday it had sent questions to Borse Dubai about Borse Dubai's $4.0 billion bid for the company, which topped an agreed $3.7 billion deal with Nasdaq.

The Nordic and Baltic bourse firm said that it had sent a list of questions which will help the Board properly assess the Borse Dubai offer.

Borse Dubai, the holding company for Dubai Financial Market

(DFM) and Dubai International Financial Exchange (DIFX), launched its 230 crowns per share, all-cash bid for OMX on Aug. 9.

This topped a bid by Nasdaq, announced in May, that was backed by OMX's board. Nasdaq's cash-and-shares bid is currently worth around 205 crowns per share.

OMX shares were trading at 239.50 crowns at 1240 GMT, indicating the market expects Nasdaq to improve its offer.

We won't go into detail on the questions, OMX spokesman Jonas Rodny said.

These are the questions you normally have.

Rodny said that when Borse Dubai made the offer, the OMX board said it would keep shareholders updated.

Asked whether OMX had specified a timeframe for any Borse Dubai answers, the spokesman said no, but that all parties had an interest in handling issues surrounding OMX bids as rapidly as possible.

Asked whether OMX would announce the answers to the question, the spokesman said: We won't make the answers public unless we need to do that from a disclosure point of view.