EDWARD Haughey, also known as The Right Honourable Lord Ballyedmond, established his veterinary pharmaceutical business in 1968.
Norbrook now employs 1,700 people, selling to 120 countries, with manufacturing plants in four continents.
Dundalk-born Mr Haughey also operates a subsidiary in Co Monaghan called Norbrook Laboratories (Ireland) but the firm is based in Newry.
The company specialises in the development, licensing, manufacturing and marketing of veterinary pharmaceuticals and active pharmaceutical ingredients.
Along with the three manufacturing and distribution facilities sites in Newry and the Dundalk base, Norbrook also has manufacturing and distribution facilities in the United States, Central Europe, Australasia, South America and Africa. It invests a significant proportion of its revenues in the research and development of new products and gave charitable donations totalling £377,082 and political donations of £100,000 to the Conservative Party last year, according to company accounts.
They showed pre-tax profits at Norbrook Laboratories fell slightly last year by 5% to £15.8m, despite a 12.3% jump in sales to £180.6m in the 12 months to the end of August.
The directors' report for the parent company says "the group saw continued improvement in its turnover across all of its business activities during the period with turnover increasing to £180m".
According to the report, sales rose "due to our broader product range, increasing customer loyalty and improved product quality and availability".