The Paper is based on a ten-year experiment examining the effectiveness of RSI on the top three stocks in the Nifty Auto Index. The study uses a ten-year data collection that runs from April 1, 2012, to March 31, 2022. The data is broken down into two sub-periods, the first of which runs from April 1 to March 31, 2017, and the second of which is from April 1 to March 31, 2017, 2022. The researcher employed the 50 crossover rule in conjunction with the relative strength index approach. The researcher estimated Alpha returns for every stock in order to evaluate the effectiveness of the strategies. The stocks taken for the study are three most weighted stocks of Nifty Auto Index which includes Maruti Suzuki India Ltd. (19.28%), Mahindra & Mahindra Ltd. (18.02%) and Tata Motors Ltd. (14.48%). The alpha returns are computed by deducting the index return, or the return of a passive strategy, from the return produced by the markets employing the various methodologies being investigated. It has been discovered via study that the effectiveness of RSI is not strong in the first subperiod but is strong in the second subperiod. The outcome demonstrates that there is a sizable variation in alpha returns over two subperiods. However, the researcher believes that additional data must be gathered before drawing any conclusions about the effectiveness of RSI.