The story
In May 1999, trading started at the Amsterdam Power Exchange (APX). It was the first electricity exchange market in Continental Europe. In 2000, the UK's first independent power exchange UKPX (now APX Power UK) was established followed by launch of APX UK electricity spot market in 2001. UKPX was acquired by APX in 2004.
ENDEX was acquired by APX Group in 2008 and the integration was completed in 2009. After merging the APX Group and ENDEX a new name APX-ENDEX was introduced.
In 2005, APX became a shareholder of Belgian power exchange Belpex SA. 19 April 2010, APX and Belpex announced that they will integrate their activities and Belpex is becoming a part of APX. Belpex is a 100% subsidiary of APX.
On 1 March 2013, APX-ENDEX separated into two companies: the power spot exchange APX and the gas spot, gas derivatives and power derivatives exchange ENDEX. As of 27 March 2014, Intercontinental Exchange (ICE) is the majority shareholder of ENDEX. The name of the new company is ICE Endex.
On 17 April 2015, EPEX SPOT and APX Group, including Belpex, announced their intention to integrate their businesses in order to form a Power Exchange for Central Western Europe (CWE) and the UK.
From Wikipedia’s article on APX Group, shared under CC BY-SA 4.0.3