This paper aims to explore the relationship between the quality of the audit and the level of stock return co-movement in the context of the Vietnamese emerging market. The empirical study is designed based on the quatitative method and deductive approach. The panel datasetincludes 256listed firmsfrom different industries,with 1115 firm-year observations on Ho Chi Minh City Stock Exchange for the period from 2014 to 2018. In the research, we built the econometric regression model, using stock return synchronicity and audit quality as the dependent and independent variable, respectively. Some control variables are also added to the econometric regression models as they are well-documented in prior research to have an effect on stock price synchronicity. To improve the accuracy of the regression coefficients, besidetheOrdinary Least Squares, we employ theRandom Effects Modeland theFixed Effects Model for better statistical analysis of panel data set. The resultsshow that the quality of the audit is positively correlated to stock price synchronicity. This finding suggests that stock returns of companies with higher quality of the audit are more synchronous with the market. Results for other control variables also support our reasoning for the main findings.

Abstract
1. Introduction
2. Literature Review
    2.1. Audit Quality
    2.2. Stock Price Synchronicity
    2.3. The Relationship between Audit Quality andStock Price Synchronicity
3. Research Methodology
    3.1. Research Methods
    3.2. Data Collection
4. Results and Discussion
    4.1. Descriptive Statistics
    4.2. Results and Discussion
5. Conclusion
References

• Chi Bich Thi PHAM(Director of the Accounting and Finance Department, National Economics University)
• Thu Minh Thi VU(School of Accounting and Auditing, National Economics University) Corresponding Author.
• Linh Ha NGUYEN(School of Accounting and Auditing, National Economics University)
• Dung Duc NGUYEN(School of Accounting and Auditing, National Economics University)