1863: The Stockholm Securities Exchange (Stockholms Fondbörs) is founded.
1918: The Stockholm Stock Exchange becomes the world’s quietest exchange when a new electromechanical quotation system is introduced.
1974: The computerization of the Stock Exchange started and electronics began to replace the blackboards in the after-hours trading session. Data communication services were developed for Stock Exchange members and other parties.
1985: Olof Stenhammar started OM to offer options trading. OM would later merge with Stockholm Stock Exchange in 1998.
1986: The OMX Index is introduced.
1989: The exchange begins using SAX, an automated securities trading system, challenging the idea that trading had to be done on the floor of an exchange. The last day of trading on the trading floor was May 31, 1990.
1998: The Stockholm Stock Exchange merges with OM Gruppen. The name of the newly formed company was OM Stockholmsbörsen.
2004: OM acquired the Helsinki Stock Exchange (HEX) and changed the company name to OMX AB. This acquisition included the Baltic stock exchanges in Tallinn, Riga and Vilnius.
2005: OMX acquired the Copenhagen Stock Exchange.
2006: OMX acquired the Iceland Stock Exchange. Nordic First North Market was formed as further development of Nya Marknaden established in 1998.
2008: Nasdaq and the Nordic stock exchange OMX AB announced the completion of their merger, becoming Nasdaq OMX.
2015: Nasdaq Stockholm launched the world's first Sustainable Bond Markets.
2021: Nasdaq acquired majority ownership in the carbon removal platform Puro.earth.