OM AB (Optionsmäklarna) was a futures exchange founded by Olof Stenhammar in the 1980s to introduce trading in standardized option contracts in Sweden.

[7] During the dot-com bubble in the early 2000s, OM, together with investment bank Morgan Stanley Dean Witter, launched a virtual European stock exchange called Jiway.

[12] On 19 September 2006, Iceland Stock Exchange owner Eignarhaldsfelagid Verdbrefathing (EV) announced it would be acquired by OMX in a deal valuing the company at 250 million SEK.

The acquisition greatly expanded its product offerings and made its client list the largest of all trading system technology providers.

[22] In a complex transaction, Borse Dubai acquired 97.2% of OMX's outstanding shares before selling them to NASDAQ.

[23] The newly merged company was renamed the NASDAQ OMX Group[24] upon completion of the deal on 27 February 2008.