Investment decisions are usually influenced by various market factors including public and private information factors. The major goal of this research was to look into the market characteristics that influence individual investors' investment performance in the Nairobi Securities Exchange. The investigators hypothesized that H 01 : Market factors (public information and expert information) do not have a substantial impact on individual NSE investors' investment results. The investigator used a survey study design to reach the aim of 1,196,995 individual investors on the Nairobi Securities Exchange. The Slovin's method was used to estimate the 400 sample size of a population, while the researcher used the Nairobi Securities Exchange's top limit of 500 individual investors. To acquire primary data, a structured questionnaire was used. The study found that public information has a considerable impact on individual investors' investment success on the NSE, whereas expert knowledge does not. The researcher recommends that the capital market authority should come up with sensitization programme which can be done through the brokerage firms to provide public information. The training for the individual investors may be organized through the media such as the radio and television to promote availability of public information to individual investors in NSE. The policy makers should also introduce training programs for the individual investors of the stock market to enhance the culture of using market information that will reduce the influence investment performance.