W & J Knox Ltd was first established when the Knox family set up a small textile mill in Kilbirnie to spin the locally-grown flax fibre and to manufacture linen thread. It was first registered as a company in 1778 then subsequently named W & J Knox in the 1800s by the sons of the founder.
Two centuries later, Knox is still based in the same Ayrshire town, with the Norwegian Selstad Group a majority shareholder since 2021.