The capital market is a source of money from those with savings and a source of facilitation into links between those who have savings within who wants to spend money. This is focusing factors influencing to stock prices in stock market of SET100 Co., Ltd, Thailand.Mixed method research into the collectionson qualitative study todocumentary, andquantitative study tosecondary data, obtained from set smart includes stock trading data of SET100, financial statement data, and other related data. Factors to stock prices in stock market of 6th factors include book value per share(BVPS), current ratio (CURR), debt to equity ratio (DE), fixed asset turnover (FAT), market capitalization (MCAP), and return on asset (ROA). Relationship of factors influencing to stock prices in stock market as BVPS, MCAP, and FAT to confidence level of 99% in the same direction.