CIOKS is a Danish company founded by Poul Ciok in 1991, initially offering the CIOKS Baby power supply with 5 outlets of 9V each. As digital effects pedals gained popularity, the Big John and Double Jack power supplies were introduced in 1995 - the Big John featured seven 9V outlets and the Double Jack featured five 9V outlets plus two 12V outlets.
The company continued to grow, and in 2004 a sister company was established in Poland to handle manufacturing and development. The Professional Range was introduced in 2010, featuring toroidal transformers and all-metal enclosures, while the LINK Range allowed users to power multiple power supplies from a single mains cord. In 2017, the Future Power Generation range was developed with switch-mode power supplies, designed by Mads Peter Frium, and in 2018, the first three products were shown at the NAMM show. CIOKS has continued to expand its product range with the release of the C4e, C8e, Superpower Bundle, SOL power supply, and CRUX in recent years.