The document analyzes the impact of internal factors on stock prices of companies listed on the Vietnam stock market from 2011-2015. Using panel data models including fixed effects, random effects and GMM, the analysis found that: 1) Return on equity, book value per share, dividend per share, and firm size had a positive impact on stock price. 2) Dividend yield had a negative impact on stock price. 3) Price earnings and debt to assets ratios did not have a statistically significant impact on stock price. The results indicate that profitable and well-capitalized companies with higher dividends tend to have higher stock prices, while high dividend yields correspond to lower prices.