The Stress Tolerant Maize for Africa (STMA) team initiated a study on maize seed systems in sub-Saharan Africa (SSA) in March 2016. A fully structured questionnaire was developed and distributed to 95 seed companies known to market maize seed in 14 countries in eastern Africa (Ethiopia, Kenya, Tanzania and Uganda); southern Africa (Malawi, Mozambique, South Africa, Zambia and Zimbabwe); and West Africa (Benin, Burkina Faso, Ghana, Mali and Nigeria). The study explored three broad areas – namely: a) current status of the maize seed industry; b) sources of maize varieties and early generation seed (breeder seed and foundation seed) for seed companies; and c) policy environment and capital investment. A total of 91 seed companies responded to the questionnaire. Here is a detailed listing of those companies.