The purpose of this research study is to observe the result of investor sentiment towards corporate announcement. Researcher used descriptive research and investigative research design in this study. The methodology used for evaluating data is technical and statistical tools for analysis. Data's are real and are gathered from small investors and London stock exchange, FTSE 250 Index listed companies share prices. The investor behaviour during corporate announcement period was found to be varying during pre and post announcement but, actually in some cases, both security returns variability and cumulative abnormal return values proved that share prices increases during post announcement period of dividend and sources of information obtained by institutional investors are greater than the small size investors. Time constraints are the limitation and the generalization of the finding should be approach with care as it is a single research study based on a part of financial institution and stock market. This research paper is focused for investor. The market has captured the dividend announcement and contains information that is positively reacted after the announcement.