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This study examines and compares the Capital Asset Pricing Model (CAPM) with the Sharia Compliance Asset Pricing Model (SCAPM) in constructing an optimal stock portfolio based on the sharia stock index on the Indonesia Stock Exchange, specifically the Jakarta Islamic Index (JII), during the 2019–2023 period. The primary aim is to evaluate whether the SCAPM, which incorporates mudharabah profit-sharing returns in place of the risk-free rate, offers more relevant insights for Muslim investors compared to the CAPM. Utilizing a quantitative approach and a two-step regression method, the research develops an optimal portfolio by calculating stock betas and analyzing the relationship between systematic risk and expected returns. The findings reveal that neither the CAPM nor the SCAPM models are valid for predicting risk and expected returns for the JII's optimal stock portfolio. This study is intended to guide sharia-compliant investors in making informed decisions and assist investment managers in designing strategies aligned with Islamic financial principles.

The aim of this research is to determine the influence of Intellectual Capita, Good Corporate Governance, Accounting Conservatism on finance with company size as a moderating variable in companies registered on the Jakarta Islamic Index (JII) 2018-2022. Data used is quantitative source secondary data company financial reports for 2018-2022. Data analysis uses multiple linear regression and hypothesis testing. The research results obtained were that Intellectual capital and accounting conservatism had a significant effect on ROA in companies listed on (JII) 2018-2020, while good corporate governance had no significant effect on ROA in companies listed on (JII) 2018-2020. Intellectual capital has a significant effect on ROA with company size as a mediating variable in companies listed (JII) 2018-2020. Meanwhile, good corporate governance and accounting conservatism do not have a significant effect on ROA with company size as a mediating variable in companies listed (JII) for 2018-2020.

The main objective of this study is to examine the impact of investment on stock performance both directly and by using the role of liquidity. The population of shares included in JII70 for the 2019-2022 period, using purposive sampling, obtained 38 shares that met the criteria, thus there were 152 data used in testing, using the MRA analysis tool. The test results showed that investment had a significant direct impact on improving stock performance, and was also further strengthened by liquidity.

The Financial Services Authority (OJK) stated that the improving conditions of the Covid-19 Pandemic had an impact on Indonesia's economic growth with growth in Q4-2021 of 5.02% (yoy). In maintaining the momentum of economic recovery during the Covid-19 pandemic, the sharia financial services industry also experienced positive growth with Indonesian sharia financial assets able to grow by 13.82% (yoy) to IDR 2,050.44 trillion in 2021, and the previous year 2020 amounted to IDR 1,801.40 trillion, while in 2019 it amounted to IDR 1,291.48 trillion and in 2018 it amounted to IDR 1,265.97 trillion. This shows that sharia finance is able to survive well during the Covid-19 era. This research aims to determine the effect of Debt to Assets Ratio (DAR) and Debt to Equity Ratio (DER) on Return On Equity (ROE) in companies listed on the Jakarta Islamic Index (JII) for the 2018-2021 period. The method used in this research is quantitative research methods. The sample used is companies registered on the Jakarta Islamic Index (JII). Based on the purpose sampling method, there were 9 companies that met the criteria. The results of this research show that partially the Debt to Assets Ratio (DAR) has no significant effect on Return On Equity (ROE), while the Debt to Equity Ratio (DER) has a significant effect on Return On Equity (ROE) in Jakarta Islamic Index companies. This research also shows that simultaneously Debt to Assets Ratio (DAR) and Debt to Equity Ratio (DER) have a significant effect on Return On Equity (ROE) in Jakarta Islamic Index companies.

Research of stock portfolio performance based on market to book value (PBV) and market capitalization are still a debate and pro kontra. The purpose of this research is to analyze the performance of stock portfolio based on PBV and market capitalization. The samples of this study Jakarta Islamic Indeks (JII)  during periode 2020-2022. Total Observation of 60 was determined by purposive sampling method. Performance of stock portfolio based on PBV is devided by 2 format stock portfolios, namely: PBV high and PBV low. For market capitalization is devided by 2 format stock portfolio namely : big market capitalization and small market capitalization. All of them are measured by Risk  Adjusted Return (index of Sharpe and Treynor). The result of these research is stock portfolio performance namely PBV low is outperform than PBV high, big market capitalization and small market capitalization which measured by index Sharpe and index Treynor during periode 2020 – 2022 at Jakarta Islamic Indeks (JII). The implication of this study suggests to perform of  stock performance namely PBV low which havethe  potential high earning growth because PBV less than one, means undervalued.

This research aims to test whether investment decisions, funding decisions and dividend policy influence company value. The data used in the research is secondary data. The population of this research is companies registered in the Jakarta Islamic Index (JII) 70 for 2018-2021. Determining the sample in the research used the porpusive sampling method with special criteria to obtain 68 data. The results of this research prove that the influence of investment decisions on company value is 0.256 > 0.05 and the calculated t value is 1.147 < 1.99714. There is no influence of investment decisions on value. Company. The influence of funding decisions on company value is 0.000 < 0.05 and t count is 6.384 > 1.99714. There is a significant influence of funding decisions on company value. The influence of dividend policy on company value is 0.116 > 0.05 and the calculated t is 1.595 < 1.99714 so it can be concluded that there is no influence of dividend policy on company value.

This research is motivated by the complex relationship between operating leverage, financial leverage, and earnings per share (EPS) in the context of corporate finance. This research aims to analyze the impact of operating leverage and financial leverage on earnings per share in manufacturing companies listed on the Jakarta Islamic Index during the period 2018-2022. Utilizing financial data from the sample companies, the study adopts a quantitative approach with regression analysis using Eviews to evaluate the relationship between operational and financial leverage with the performance of earnings per share. The research results indicate that operating leverage does not have a significant effect on earnings per share, with a partial test probability value of 0.9744 > 0.05. Financial leverage also does not have a significant effect on earnings per share, with a partial test probability value of 0.7368 > 0.05. Simultaneously, operating leverage and financial leverage do not have a significant effect on earnings per share, with a simultaneous test probability value of 0.94578 > 0.05. The calculation of the coefficient of determination shows that the independent variables in the model fail to explain the variation in the dependent variable well. Subsequent research is recommended to increase the sample size of manufacturing companies listed on the JII and replace insignificant independent variables with others that can significantly influence earnings per share.

The development of Islamic economics with the application of sharia principles in economic activities is starting to be practiced in the field of sharia finance. This started with the establishment of sharia banking, then followed by the emergence of the sharia capital market as an investment tool to attract profits and seek capital. The Jakarta Islamic Index (JII) as the antithesis of the conventional capital market has challenges when carrying out investments using sharia principles, this is because securities in the form of shares are greatly influenced by macroeconomic aspects such as interest rates. So sharia share prices are very sensitive to the dynamics of interest rates. This research seeks to see the extent of the influence of interest rates on sharia sham prices at JII. The method used is VECM analysis to see long-term effects. The results of this research found that the interest rate variable did not significantly influence sharia stock prices in the long term, however the results of the VECM analysis found that there was a negative relationship, meaning that there was still an influence, although not significant. So sharia share prices can still be affected by changes in conventional interest rates.