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The objectives of this research were to study the relationship between stock prices and investments in subsidiaries according to the equity method under TAS 27 of companies listed on the Stock Exchange of Thailand and to analyze the relationship classified by industry groups. Study periods were during the years 2017 – 2019. The total number of samples was 513. This research was quantitative research using statistics such as descriptive statistics, correlation analysis, and multiple regression analysis. Research results showed that investments in subsidiaries under the equity method have a positive relationship with the stock price, and when classified by type of industry. It was found that investments in subsidiaries under the equity method of companies in the agricultural & food industry, industrial products, real estate and construction, and the resources group have a positive relationship with the stock price, while investments in subsidiaries under the equity method of companies in the consumer goods, service, and technology groups have no relationship with the stock price.
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