A group of 21 non-Swedish investors last week made Skr600m (€64.1m) from selling shares in OMX to Borse Dubai, the United Arab Emirates-based company which is expected to table an offer for the Nordic exchange group this week, sparking a bidding war with Nasdaq of the US.

Hedge funds including Mason Capital, Deephaven and Eton Park, shared as much as Skr600m from buying shares at an average of Skr212 a share and selling them on to Borse Dubai.