Greencore Group plc is a food company in Ireland. It was established by the Irish government in 1991, when Irish Sugar was privatised, but today Greencore's products are mainly convenience foods, not only in the Republic of Ireland but also in the United Kingdom. 

A major supplier to British and Irish supermarkets, Greencore is the largest sandwich manufacturer in the world. It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

The company was established in 1926 in Carlow as a private enterprise known as the Irish Sugar Manufacturing Company, Limited. The Sugar Manufacture Act, 1933 was passed to promote self-sufficiency in sugar manufacture. The Sugar Act, 1991 privatised the entity and it became Greencore at that time. The Act was passed as the company had diversified beyond being a sugar-manufacturing company into other food products.

On 25 July 2016, the company acquired The Sandwich Factory Holdings Ltd for £15m from Cranswick plc. On 14 November 2016, Greencore announced it would acquire US-based Peacock Foods for $747.5m, significantly expanding its presence in the country.

Greencore is the world’s largest maker of sandwiches, produces 350 million a year, and has a 36% share of the UK market.

According to en.wikipedia