This study aims to examine the effect of Product Diversification, Capital Structure, Working Capital Turnover, and Company Size on Profitability of Telecommunication Sub-Sector Companies listed on the Indonesia Stock Exchange (IDX) for the 2015-2020 period partially and simultaneously. The data used is secondary data which is accessed through the website www.idx.co.id. The sampling technique in this study is a saturated sample/census, where all the population is used as a sample consisting of 5 telecommunications sub-sector companies listed on the Indonesia Stock Exchange (IDX) for the 2015-2020 period. The data analysis used is panel data regression with the help of the Eviews 9 tool. The results show that, partially, product diversification and working capital turnover have no significant effect on profitability. While the capital structure and size of the company have a significant effect on profitability. While simultaneously all independent variables affect the dependent variable, with a coefficient of determination of 65.27%.
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