A H Marks and Company Limited is the UK's largest privately owned and independent chemical manufacturing company, employing over 350 people and operating from a single 11 hectare site at Wyke, near Bradford. Chemicals have been produced at the Wyke site since 1877, when dyestuffs were produced for the local textile industry.

Today, the company manufactures a wide range of specialised organic chemicals for a variety of end use sectors. Key customers include manufacturers of crop protection, petrochemicals and biocides.

A H Marks' annual sales turnover exceeds�million ($120 million), and exports account for over 75% of the company's business interests, with expanding sales in over 40 countries worldwide.

Supporting this strong sales performance is a commitment to quality. The company is registered to ISO9001:2000 and is in compliance with Good Laboratory Practice (GLP) and the Investors in People (IIP) standard. A H Marks is also registered to the International environmental standard ISO 14001: 2004.