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The purpose of this study is to determine partially or simultaneously with the variable profitability (which is proxied by ROE), investment decisions (which are proxied by PER), and funding decisions (which are proxied by DER) on firm value (which is proxied by PBV). The population in this study are mining companies in the oil and gas sub-sector which are listed on the Indonesia Stock Exchange for the 2017-2021 period either partially or simultaneously. The sampling technique uses saturated sampling method. From this method, all companies became the research sample during the five-year observation period. The total sample is 11 companies. The analytical method in this test uses multiple regression analysis using the SPSS version 25 test tool. The results show that partially profitability (which is proxied by ROE) has no effect on firm value (which is proxied by PBV, investment decisions (which are proxied by PER) has partially affected on firm value (which is proxied by PBV), and funding decisions (which are proxied by DER) partially have no effect on firm value (which is proxied by PBV), Profitability (which is proxied by ROE), investment decisions (which are proxied by PER), and funding decisions (which are proxied by DER) simultaneously affect firm value (which is proxied by PBV). The Fcount value is greater than the Ftable value (7.338>2.00758) with a significant value of 0.000 which means less than 0.05.

Crude Oil, which has long been a mainstay sector in Indonesia's exports, contributes greatly to state revenue, thus driving the pace of national economic growth. In the context of the Indonesian economy, the crude oil industry plays an indispensable role, especially over the past few decades. This study aims to identify the factors that affect the volume of Indonesia's crude oil exports to nine main destination countries—including Japan, South Korea, China, Thailand, Singapore, Malaysia, Australia, the United States, and Taiwan—in the period from 2003 to 2022. Some of the variables analyzed include exchange rates, foreign investment, production, and world oil prices. Through the regression analysis method of panel data, the results of this study indicate that simultaneously, exchange rates, foreign investment, production, and world oil prices have a significant effect on Indonesia's crude oil exports to these countries. Separately, the world exchange rate and oil price variables had a significant negative influence on Indonesia's crude oil export volume, while the foreign investment and production variables showed a positive and significant influence on export volume during the 2003-2022 research period.

Sumi Lala.202010325238. Portofolio Construction On The Indonesia Stock Exchange (BEI) Using The Markowitz method (Empirical Study Of Kompas 100 period December 2014 – September 2023). Investment development is currently very rapid. Ownership of 2 or more items can called a portofolio.Investments will experience increases and decreases in the portofolio. This research aims to understand the level of  return of portofolios formed through Markowitz and also a comparison between portfolios returm with market capitalization and weighting. The shares in the portfolio are shares listed on the Kompas 100 Index. This research uses end of month data for the period December 2014 to September 2023.The results of this research found that 61 shares included in the portolio did not have a negative weight.the next result of this research is that the market rate of return portolio (IHSG) Significantly influences the rate of return of the portfolio that has been formed based on market capitalization significantly 1% Other macro variables US Dollar exchange rate.Interest rates and oil prices do not significantly affect the rate of return portfolios formed based on Market Capitalization.