The purpose of this research is to determine the optimal portfolio for manufacturing entities listed on the Indonesian Sharia Stock Index based on a single index model test. The population of this research is manufacturing entities that have been listed in the Indonesian Sharia Stock Index on the Indonesia Stock Exchange for the Period 2019-2020. This study uses a purposive sampling technique using several criteria. Based on this technique, 31 entities meet the criteria. The results showed that the expected return was 5.65%, and the possible risk was 0.22% for 15 (fifteen) stocks included in the optimal portfolio category.

This study aims to determine whether or not there is a discrepancy in Corporate Social Responsibility (CSR) disclosure between sharia and conventional banks in Indonesia, and which CSR aspects are better between those two types of the banks. This study applied a quantitative approach. The analysis method used in this study to test the hypothesis was independent sample t-test. The method was applied to determine whether there is a significant difference in the average value between sharia and conventional banks. The number of samples in this study were 40 consisting of 20 Islamic banks and 20 conventional banks. The data taken were those between 2011 and 2014 which contained the information related to CSR. The results of this study indicated that there were significant differences in CSR disclosure between sharia and conventional banks. On average, CSR disclosure rate of sharia banks was higher than that of conventional banks. The weaknesses of CSR disclosure of sharia banks were in the aspects of environment and general information, while the weaknesses of CSR disclosure of conventional banks were in the aspects of energy, health and safety of the employee, product, and society involvement. Due to the limitation of this study in compiling the aspects of variables presented in Global Reporting Initiative (GRI) and Islamic Social Reporting (ISR), it is suggested for the future study to do further detail analysis to compile and to combine with the primary data in order to get the precise quality of the data disclosed by each bank.

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This study aims to examine the effect of corporate governance mechanisms on the percentage of profits in manufacturing companies. The population in this study is manufacturing companies in the industrial & chemical sector, which are listed on the Indonesia Stock Exchange (IDX) during the 2017-2019 period. The samples were selected using the purposive sampling method and resulted in 34 manufacturing companies in the industrial and chemical sectors. Data were taken from the Indonesia Stock Exchange for the 2017-2019 period. The independent variable in this study is corporate governance with a focus on the board of commissioners and the audit committee, while the dependent variable is the effect of profit percentage on manufacturing companies. This study used simple linear regression analysis. From the regression analysis in this study, the two corporate governance proxies which include the board of commissioners and the audit committee have a significant positive effect on company profits. These results provide evidence that the existence of a board of commissioners and an audit committee in manufacturing companies in Indonesia has been effectively associated with the company’s profit percentage gain.