The relationship between business performance and diversification or concentration is a very important topic. In this context, this article presents the evidence obtained by comparing the yield of 82 Chilean corporations, selected at random, with their concentration or diversification strategy. The methodology involved the classification of strategies by a matrix based on the International Standard Industrial Code (ISIC) of Chile, and implementation of the Du Pont method for determining the outcome. The main evidence is that most companies are concentrated, but companies with associated diversification strategy gained a greater average yield than concentrated companies and companies with an unrelated diversification strategy.