The Worshipful Company of Horners maintains the constitution, traditions and customs of the City of London and supports the Lord Mayor and Corporation in promoting the status and the image of the city. The company seeks to maintain and support the ancient crafts of the Horner and Bottlemaker and promotes the interests and developments of Plastics, the Plastics Industry and scientific education. It does so while promoting the good fellowship and welfare of its Liverymen, Freemen and its guests.

The Worshipful Company of Horners is both an ancient guild and livery company and a modern City institution. The first historic reference to the Company was recorded in 1284 although the Horners craft dates from centuries before. In 1476 the Horners were joined by the Bottlemakers whose trade (in leather bottles) was already eroded by glass bottles. The Company operates under a Charter received from Charles I in 1638 (although it is known that there were earlier charters). As the craft of working with horn declined, the Company had the vision in 1943, to adopt its modern equivalent, the Plastics Industry.

The Company satisfies its Mission through the actions of its Master, Wardens, Court of Assistants, Liverymen and Freemen and through its programmes of its sponsorships and through the important links which it maintains with the City of London and Horners and Plastics crafts. In setting his annual programme, the Master is mindful of the Mission of the Company and fosters the links important to the Company.