Devenish
Devenish is a farming and food company based in Belfast, delivering sustainable and innovative nutritional products and solutions for the feed industry, the food industry and for human health. 
https://www.devenishnutrition.com/

Finnebrogue
A Downpatrick based company which develops and produces processed pork products. Has provided products for many well-known brands 
http://www.finnebrogue.com/

 Glenarm Organic Salmon Ltd
Established in 2008, Glenarm Organic Salmon Ltd is the only Atlantic salmon farmer in the Irish Sea and the sole producer of the world's finest Organic Salmon. 
https://glenarmorganicsalmon.com

Lough Neagh Fisherman’s Co- operative
The Lough Neagh Fishermen’s Co-operative has been amongst the fore runners of wild eel producers for decades and is recognised as the largest producer of wild caught eel in Europe, producing around 400 tonnes of eel annually.  
https://www.loughneagheels.com/

Thompsons and Sons
Thompsons, which was founded in 1870, is the largest multi-species feed mill in Europe. The company originated in Donegall Quay and now resides on York Road Belfast. 
https://www.thompson.co.uk/