The Copenhagen Stock Exchange or CSE , since 2014 officially called Nasdaq Copenhagen, is an international marketplace for Danish securities, including shares, bonds, treasury bills and notes, and financial futures and options.Nasdaq Copenhagen is one of the Nasdaq Nordic Exchanges. Nasdaq Nordic goes back to the 2003 merger of OM AB and HEX plc to form OMX and is, since February 2008, part of Nasdaq, Inc. .

More details: https://en.wikipedia.org/wiki/Copenhagen_Stock_Exchange