This study examines the relationship between company and ownership characteristics and the disclosure level of compliance with Quoted Companies Alliance (QCA) recommendations on corporate governance in Alternative Investment Market (AIM) companies. We report clear evidence that compliance increases with company size, board size, the proportion of independent non-executive directors, the presence of turnover revenue, and being formerly listed on the Main Market. However, we find that shell and highly geared AIM companies disclose relatively lower levels of corporate governance than recommended under QCA guidelines. Our findings suggest that market regulators should review the potential impact of the quality of corporate governance in these companies on the future vibrancy of AIM. We find no evidence that ownership structure or the type of Nominated Advisor is related to disclosure of compliance with QCA guidelines. Overall, in a lightly regulated environment such as the AIM market, it seems that companies will ultimately pursue a cost–benefit strategy in voluntarily complying with good corporate governance practice.