چكيده به لاتين
Previous studies have shown that changes in stock prices are influenced by several factors. Knowing these factors and variables can provide valuable information to stock market investors as well as company managers to increase the value of their stock market. Considering the importance of stock value for investors and company managers, the factors that affect stock prices have been considered by many researchers. Factors affecting the stock price of companies can be classified into internal factors and factors outside the internal limits. Internal factors are directly related to the company's operations and decisions on stock prices. External factors include factors outside the scope of the company's management authority that can be divided into political and economic factors. In the present study, the effect of various factors on the stock price of petrochemical companies has been investigated. GDP at constant price and consumer price index, as external factors and sales, size or capital, rate of return on assets, capital increase and diversification as internal factors affecting the stock price of petrochemical products in the years 1389-1398 related to 13 studied companies were identified. The research method is descriptive-survey and applied (panel data). According to the results of this study, the GDP is significant with a negative coefficient and the consumer price index as a representative of the inflation index, significant and with a positive coefficient. ROA and the sales variable, which represent operating funds, have a positive effect on stock prices. The size or amount of the company's capital variable also has a significant and negative effect on stock prices. The coefficient of Herfindal-Hirschman variable in this model is obtained with a positive sign, which can indicate the effect on the stock price of petrochemical companies. From this point of view, If the companies under review divide their existing expertise and facilities and production factors into several products, it can have a negative effect on the stock price of that company compared to a company that specializes in the production of one type of product and all its expert forces and agents. To devote to the production of a product. The effect of capital increase of petrochemical companies on stock prices is also significant according to the results and shows a positive effect on stock prices of petrochemical companies.
