Twiga Chemical Industries was incorporated on 18th May 1949, then referred to as AECI (EA) Ltd. It was a subsidiary of Imperial Chemical Industries PLC (ICI),UK. By a Special Resolution passed on the 1st July 1962, the company was renamed ‘Twiga Chemical Industries Limited'. The Company engaged in the supply and distribution of Explosives, Agrochemicals, Industrial Chemicals and Pharmaceuticals. Some of the Agrochemicals were locally formulated or repacked in the Company’s Factory in Industrial Area, Nairobi.

In 1993, the AJ Group bought the controlling interest from ICI. In 2000, Animal Health Division was introduced with the intention of tapping the potential in this sector. The Division has expanded over the years. In 2004, the company discontinued the Pharmaceuticals Division. In 2006 the company implemented an ERP system ( Oracle E-Business Suite) covering the entire business operations of the company. In 2008 the company completed a major modernization programme at the Toll Manufacturing Centre that involved laying of new roads, purchase of new powder and liquid filling machines and pollution control equipments.

The laboratory acquired a new High Performance Liquid Chromatograph. In 2009 the entire company was certified ISO 9001:2008. The Company is managed by a team of experienced qualified professionals in each of its areas of business.