Corporate governance and conglomerate diversification strategy – evidence from Vietnam

Purpose - The purpose of this paper is to examine the impact of internal corporate governance mechanisms, including interest alignment and control devices, on the unrelated diversification level in Vietnam. Additionally, the moderation of free cash flow (FCF) on these relationships is also tested. Design/methodology/approach - The study is based on a balanced panel data set of 70 listed companies in both stock markets, Ho Chi Minh Stock Exchange and Hanoi Stock Exchange, in Vietnam for the years 2007–2014, which gives 560 observations in total. Findings - The results show that if executive ownership for CEOs is increased, then the extent of diversification is likely to be reduced. However, the link between unrelated diversification level and executive stock option, another interest alignment device, cannot be confirmed. Among three control devices (level of blockholder ownership, board composition and separation of CEO and chairman positions), the study finds a positive connection between diversification and blockholder ownership, and statistically insignificant relations between the conglomerate diversification level and board composition, or CEO duality. Additionally, this study discovers a negative link between diversification and state ownership, although there is no evidence to support the change to the effect of each internal corporate governance mechanism on the diversification level of a firm between high and low FCF. Practical implications - The research can be a useful reference not only for investors and managers but also for policy makers in Vietnam. This study explores the relationship among corporate governance, diversification and firm value in Vietnam, where the topics related to effectiveness of corporate governance mechanisms to public companies has been increasingly attractive to researchers since the default of Vietnam Shipbuilding Industry Group (Vinashin) happened in 2010 and the Circular No. 121/2012/TT-BTC on 26 July 2012 of the Vietnamese Ministry of Finance was issued with regulations on corporate governance applicable to listed firms in this country. Originality/value - This research, first, enriches current literature on the relationship between corporate governance and firm diversification. It can be considered as a contribution to the related topic with an example of Vietnam, a developing country in Asia. Second, the research continues to prove non-unification in results showing the relationship between corporate governance and conglomerate diversification among different nations. Third, it provides a potential input for future research works on the moderation of FCF to the effects of corporate governance on diversification.