São Martinho SA operates the following segments: sugar, ethanol, electricity, real estate, yeast and other products. Sales of sugar and ethanol, both produced by the company with sugar cane, make up most of the company's revenue. São Martinho produces sugar and ethanol at its four Brazilian mills. The company obtains sugar cane mainly from its own plantations, agricultural partnerships, shareholders, and related companies. São Martinho exports most of its sugar and sells most of its ethanol domestically.