近年來隨著經濟全球化的發展，交易的模式日趨複雜，從2020年8月爆發康友-KY之會計舞弊案件，接連發生與KY公司相關會計醜聞，數萬名投資人受到嚴重損失。僅從公司財務報表上獲取之資訊確實難以讓投資人瞭解公司之營運狀況，從而衍生出資訊不對稱之問題。為了強化KY公司之資訊公開，並加強KY公司與投資人之溝通，金融監督管理委員會鼓勵KY公司增加法人說明會之召開頻率，以降低投資人之疑慮。本研究以2018年至2021年為樣本期間，探討公司若能於康友舞弊案後及時召開法人說明會或增加召開法人說明會之頻率或由專業機構邀請而召開法人說明會，是否會使投資人對KY公司財務報表之增額信賴程度增加，而使KY公司之增額盈餘反應係數增加。本研究採用差異中之差異（Difference-in-Differences）模型進行實證測試，實證結果顯示公司召開法人說明會的頻率越高、法人說明會之舉辦單位若為專業機構，KY公司之增額盈餘反應係數較非KY公司高。但未有證據指出康友案後，公司若有及時召開法人說明會，KY公司之增額盈餘反應係數較非KY公司高。

In recent years, with the development of economic globalization, trading patterns have become increasingly complex. Since the outbreak of the KY Pharmally accounting fraud case in August 2020, a series of accounting scandals related to KY companies have occurred, resulting in significant losses for tens of thousands of investors. It is difficult for investors to understand the operational status of a company solely based on its financial statements, leading to information asymmetry. To enhance information disclosure by KY companies and improve communication with investors, the Financial Supervisory Commission encourages KY companies to increase the frequency of conference calls to alleviate investor concerns. This thesis focuses on the period from 2018 to 2021 and examines whether timely conference calls after the KY Pharmally fraud case, or increasing frequency of conference calls, or conference calls organized by professional institutions would increase investors' incremental trust in the financial statements of KY companies and consequently increase the earnings response coefficient for KY companies. The thesis employs the Difference-in-Differences (DiD) model for empirical testing. The empirical results show that the higher the frequency of conference calls and if the organizing entity of the conference calls is a professional institution, the earnings response coefficient for KY companies is higher compared to non-KY companies.

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