“…The investors would expect the acquiring firms’ management to inform them about the M&A risk level and its related impact (Ott, 2020). To address the investors’ information demand, acquiring firms may engage in more voluntary disclosure at the announcement time to influence the investors’ responses to the merger announcement, such as supplementing press releases with conference calls (Fraunhoffer et al., 2018; Kimbrough & Louis, 2011), synergy disclosure (Dutordoir et al., 2014), and earnings forecasts (Amel‐Zadeh & Meeks, 2019). We are not clear, however, whether acquiring firms would keep supplementing more information after the initial announcement and in which condition that acquiring firms have incentives to engage in a voluntary disclosure to positively affect the market's response during the transaction.…”