Abstract: According to the Stephen P. Robbins “decision making is the selection of a preferred course of action from two or more alternatives”. There are >5000 and 1688 scrips listed for trade in Bombay Stock Exchange (wikipedia) and National Stock Exchange (NSE India), respectively under capital market segment and the investors has to take wise decision making in selection of particular scrip. Selection of Equity scrip is mainly influenced by various rational and irrational factors. The objective of the study is to find out the factors which are most influencing and least influencing and find out the significant difference between the male and female investors on rational factors. There are seven principal rational factors considered in this study namely accounting, company, external, industry, technical, advocate and individual factors comprising of 41 attributes. To attain this objective, mean and standard deviation are used for finding the most and least influencing factors and t-test has been used for finding the significant difference. To analyse, the SPSS 18 has been used and from the results it is found that the most influencing factors are promoter’s track record, past experience (success/failure), products/services of best quality, reputation of the company, life cycle of the industry (pioneer, growth, maturity, etc.), knowledge about the share market and affordable share price and the least influencing factors are get rich quick, brokerage firm’s advice, opinion’s of majority of shareholders, spouse/relatives/family members opinion and friends or coworker’s recommendation. From the t-test result, male and female investors differ significantly on company and technical factors and they does not significantly differ on other factors such as accounting, external, industry, advocate and individual factors.