Micro-enterprises (MEs) have been shown to collectively be the largest employer in most developing countries thus playing a significant role in the countries economies. Using informal sector micro-enterprise furniture makers (wood and metal) in Nairobi, Kenya and based on Porter's competitive business strategies typology, this study sought to determine if the strategies employed by the informal sector MEs fit within the typology framework, and if membership within the strategic groups in the typology are a predictor of better business business performance. From the study, although membership within the two focus strategic groups of differentiation and low cost was confirmed, unlike studies done with medium and large enterprises, membership was not found to be a predictor of better business performance. Porter's typology may therefore not adequately capture the competitive business activities relevant to and directly by MEs, presenting an opportunity for research into the development of competitive business strategy typologies directly derived from their activities and therefore applicable to them.