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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 served include manufacturers of agrochemicals, pharmaceuticals, petrochemicals and monomers. A H Marks' annual sales turnover exceeds ?5 million ($85 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 accredited to ISO9001, and is in compliance with Good Laboratory Practice (GLP) and the Investors in People (IIP) standard. During 1997, A H Marks was accredited to ISO 14001, the International environmental standard.