Background: It has become increasingly important for all corporations to make environmentally friendly decisions and consider environmental CSR. Previous studies have shown that effective corporate governance and diversity of BoDs and TMTs can affect sustainability reporting positively. However, prior literature has been underrepresented regarding SMEs. It is currently voluntary for these types of firms to report on sustainability, but new requirements are underway. Additionally, family-owned firms differ in the context of environmental CSR reporting due to the interests of the family, and that these types of firms tend to not consider the diversity as much as non-family-owned firms. 

Purpose: The purpose of this study is to investigate how the diversity of BoDs and TMTs in Swedish stock-listed SMEs impacts environmental CSR reporting. Additionally, how family firms moderate this relationship.  

Methodology: This study adopts a positivistic view, follows the deductive approach, and uses a quantitative methodology. The collected data was gathered through databases, annual reports, and other sources to get information about the diversity aspects and sustainability reporting. This was analyzed by using the Spearman correlation matrix and multiple linear regressions. 

Findings: The findings of this study only partially support the relationship between the diversity of BoDs and environmental CSR reporting. There was no support regarding the relationship between the diversity of TMTs and environmental CSR reporting. Family firms as a moderating factor to this, could also not be supported.