This study concludes that investing in bonds is a significant option for investors in the Tunis Stock Exchange, especially with the availability of historical data that offers valuable insights into the performance of these securities over an extended period. Through the application of quantitative analysis, investors can better understand the impact of various factors, such as interest rates and inflation levels, on bond returns. This understanding is essential for making informed investment decisions and for diversifying investment portfolios in line with evolving economic and financial conditions. The quantitative analysis of fixed-income securities in the Tunis Stock Exchange, conducted over the period from 1990 to 2024, reveals several important findings. Firstly, the study finds cointegration among the variables, indicating a long-term relationship between them. Secondly, it highlights the critical role of interest rates and inflation levels in determining bond yields. Lastly, the study concludes that portfolio diversification and monitoring of key economic indicators can serve as effective strategies for investors in this market. These findings underscore the importance of understanding and applying quantitative analysis to make sound investment decisions and achieve the desired returns on investments.