Although CEOs tend to make final M&A decisions (Graham et al., 2015), CFOs play an important role in identifying acquisition targets and conducting due diligence (Altman, 2002). In particular, CFOs play a crucial role in ensuring that the firm has the financial resources to finance M&A deals (Huyett & Koller, 2011). Thus, the presence of a CFO who is unwilling to challenge the CEO will not only lead the firm to undertake intensive M&As but also can affect how the M&A deals are financed.