This research aimed to study the influence of P/E ratio and market capitalization on returns of the securities in the energy sector in the Stock Exchange of Thailand. In this research the researcher has studied and collected data from the closing prices of the securities in energy sector that are currently traded in the Stock Exchange of Thailand. From January 2015 to December 2019 from the Stock Exchange of Thailand 15 companies and used descriptive analysis mean and standard deviation to test the relationship between independent variables by using correlation analysis and multiple regression analysis to determine the influence of P/E ratio and market capitalization on returns of the securities in the energy sector. The results of the research showed that the P/E ratio had a significant positive influence on returns of the energy securities in the Stock Exchange of Thailand. The market capitalization factor also found that it had no influence on returns of the energy securities in the Stock Exchange of Thailand.

This research aims to study the relationship between profitability which included gross margin operating margin net profit margin return on assets return on equity and earnings per share and price to earnings ratio and dividend yield. The data were collected from financial statements and the annual reports of the companies listed on the Stock Exchange of Thailand (SET100). The top three companies selected should yield a maximum registered capital of each business category from the 1st January to the 31st of December during 2012 and 2015. 20 companies were chosen. The statistics used in the data analysis were descriptive and analyzed by arithmetic mean maximum minimum Standard Deviation and Pearson Correlation Coefficients to describe the characteristics of the collected data. The results of the study revealed that profitability gained from the gross margin operating margin net profit margin return on assets and return on equity. The earnings per share ratio were related to the price to earnings ratio and dividend yield at the reliability level of 95% and 99%.

The objective of this study is to examine Banking Sector’s anomaly in the Stock Exchange of Thailand (SET): The influence of Market Capitalization and P/E ratio. The study focuses on 11 stocks in banking sector from January 2012-December 2016 to tally 26840 samples. The factors of this study are the return of these stocks the return of SET the market capitalization and P/E ratio of banking sector in the Stock Exchange of Thailand. The study classifies these stocks into 4 groups as following - Low market capitalization group - High market capitalization group - Low P/E ratio group - High P/E ratio group The multiple linear regressions with Ordinary Least Squares (OLS) are used in analysis at the statistically significant level of 0.1. The result shows that all 4 groups do not have statistical relationship with the return of banking sector in SET. The conclusion of this study is that there is no anomaly of banking sector from the influences of market capitalization and P/E ratio.