BSE GREENEX is one of its kind indices that assesses the listed stocks on their “carbon performance” to quantify the energy efficiency of those listed stocks based on publicly available data. Past studies have analyzed the performance of listed stock of the index but not the performance of index itself. The present study analyzes the BSE GREENEX performance. The performance has also been analyzed for pre and post covid era. The result suggests that there is consistency in return over the period of time, whereas post covid performance of index is better than that of pre covid. As post covid return outperform the pre covid return, the study concludes that including sustainable finance not only attract more profit but also brings stability to the financial market and economy as well.