Index Fund Portfolios Efficiency on the Stock Markets of the Russia, USA, Germany and China for 2012-2022

An analysis of the performance indicators of index investment portfolios of the Russian Federation, the USA, Germany and China stock markets for 2012-2022 was carried out. The most effective methods for optimizing index portfolios have been identified. An analysis and comparison of factors influencing the efficiency of index portfolios of various stock markets was carried out. Recommendations are proposed to improve the efficiency of index investment portfolios of the stock markets under consideration