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This study compares the Single Index Model and the Black-Litterman model in forming an optimal stock portfolio on a fixed sample of recurrent IDX30 constituents in order to assess differences in portfolio composition, return, risk, and risk-adjusted performance in the Indonesian capital market. This study compares the Single Index Model and the Black-Litterman model in forming an optimal stock portfolio on a fixed sample of recurrent IDX30 constituents in order to assess differences in portfolio composition, return, risk, and risk-adjusted performance in the Indonesian capital market. The Single Index Model produced a more diversified 9-stock portfolio and the stronger Sharpe ratio, while the Black-Litterman model produced a more concentrated 3-stock portfolio with higher expected return, higher Treynor ratio, and higher Jensen’s alpha. The results indicate that no single model dominates on all criteria. The Single Index Model is more favorable from the perspective of total-risk-adjusted efficiency, whereas the Black-Litterman model is more favorable from the perspective of return orientation and systematic-risk-adjusted performance. Future research should strengthen the economic justification of investor views and expand the benchmark comparison to broader Indonesian stock universes..

Measuring performance solely by relying on returns is probably not enough, it is important to consider both returns and risks. Some measurement methods that consider both of these factors are the Sharpe Ratio index, Treynor Ratio, Jensen Alpha, and Information Ratio. Risk analysis using Value at Risk Monte Carlo simulation is also important to determine the potential for extreme risks. The purpose of this study is to provide a good understanding of the performance and risk of mutual fund investments. Based on the performance results, Schroder is the most superior mutual fund, with the highest Information Ratio, Sharpe Ratio, and Jensen Ratio, indicating that they are able to generate good returns considering the risks taken. However, Schroder also has the highest VaR, meaning it has the potential for large losses in the worst market conditions. On the other hand, MNC is at the bottom in almost all performance methods, indicating poor performance with low returns and lower risks.

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.

Stock Prices Fluctuation affected by market conditions indicates that the company is not doing well. Fluctuations in the share price of Sinarmas Sekuritas Indonesia are influenced by unstable market conditions. The aim of this study is to find out whether the stocks which have been recommended by PT. Sinarmas Sekuritas Indonesia 2021 is superior or inferior. The data used in this study were in the form of secondary data contained in the Market Outlook published by PT. Sinarmas Sekuritas Indonesia, which consisted of 33 stocks during the research period. Moreover, this type of research used case studies. The result of the study shows that the value of the regression constant is negative with a significance value smaller than the significance level of 0.05. Thus, it can be concluded that the performance of PT Sinarmas Sekuritas Indonesia's stock portfolio for the January–December 2021 period is inferior which shows that the performance of the portfolio with the index has bad performance. In addition, companies whose shares have good performance are expected to maintain their company's performance, while companies that have bad performance can improve their company's performance. 

Reksa dana adalah sarana investasi yang sederhana dimana setiap orang dengan tujuan investasi jangka panjang yang sama mengumpulkan dana mereka. Kemudian mereka menunjuk manajer yang profesional untuk mengelola dana tersebut sesuai dengan tujuan investasinya.Penelitian ini dilakukan untuk mengetahui bagaimana pengaruh Expense Ratio, Turn Over, Ukuran Reksadana dan Cash Flow terhadap Kinerja Reksadana dengan menggunakan Sharpe’s Index. Data yang digunakan dalam penelitian ini adalah data bulanan NAB, expense ratio, turnover ratio dan cash flow dari 24 Reksa Dana saham  pada periode 2007-2011.Dari hasil penelitian diketahui bahwa tidak semua parameter memberikan pengaruh signifikan terhadap kinerja reksadana saham. Namun Expense Ratio, Turnover Ratio, Ukuran Reksa dana, dan Cash Flows secara simultan berpengaruh signifikan terhadap Kinerja Reksa Dana Saham.