The book "Firm Specific Explanatory Factors of Financial Performance" offers a comprehensive analysis of the specific factors that influence the financial performance of 15 publicly listed pharmaceutical companies on the Dhaka Stock Exchange in Bangladesh. The study spans the period from 2002 to 2015 and employs advanced statistical methods such as System GMM and Difference GMM to analyze the data. The results indicate that various factors, including the previous year's financial performance, the age of the company, human resources, financial leverage, and business risk, are crucial for financial performance. Notably, the consistency of financial performance in the Bangladeshi pharmaceutical sector is highlighted, as evidenced by the significant positive correlation with the previous year's financial performance. This academic book is aimed at students, researchers, and professionals seeking a deeper understanding of the dynamics of financial performance in the pharmaceutical industry.