تنويع الاستثمار في الأدوات المالية وأثره على أداء المحفظة الاستثمارية: دراسة تحليلية مقارنة لعينة من شركات في الأسواق المالية الأمريكية للفترة (1990-2020)‎

الملخص EN

The idea of the investment portfolio was and still is one of the common financial concepts in the world of business and finance, which many seek to know its contents and variables closely in order to identify the various investment concepts that allow them to invest in the right way while ensuring the protection of their capital and achieving convincing returns and profits from it.

The present research aims to identify the impact of diversification of investment in financial tools on the performance of the investment portfolio according to the Sharp model and to identify the best diversification strategies to build an investment portfolio that serves the interests of investors.

For the research requirements the data was approved for the shares of three companies in different sectors registered in the American financial markets, which includes Pfizer shares, IBM shares, and M & T Bank shares, from the period (1990 - 2020).The research found a number of conclusions, and the most important of them were the portfolio that achieved the best performance is the fourth portfolio (diversification portfolio), and this is by achieving the highest sharp rate compared to other portfolio at different levels of risk, and this indicated that good diversification has a positive impact on raising the performance of investment portfolio, while the most important suggestion working on diversifying investment tools by building investment portfolio and using financial tools that fit with the nature of the investors work.