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強制的なESG開示は株価を動かすか？EUの企業サステナビリティ報告指令からの証拠

Does Mandatory ESG Disclosure Move Stock Prices? Evidence from the European Union’s Corporate Sustainability Reporting Directive (原題)

Aleena Varekat Charly, Tetiana Paientko

Journal of risk and financial management📚 査読済 / ジャーナル2026-08-18#開示インフラOrigin: EU対象セクター: cross_sector
DOI: 10.3390/jrfm19080627
原典: https://doi.org/10.3390/jrfm19080627

🤖 gxceed AI 要約

日本語

本論文は、EUのCSRDが公表された5つの立法・基準設定マイルストーンに対する株式市場の反応を、ドイツDAX構成銘柄と米国S&P500企業のマッチング比較を用いて検証した。年次差分の差分法では正の係数が得られたが、診断テストにより規制効果とは言えないことが示された。イベントスタディでは異常リターンは検出されず、CSRDの開示義務が株価に影響を与えたという証拠は弱いと結論づけている。

English

This paper examines stock price reactions to five CSRD milestones using matched German DAX and US S&P 500 firms. The annual difference-in-differences estimator yields a positive coefficient, but diagnostics indicate it does not identify a regulatory effect. The event study finds no abnormal returns, concluding that evidence for CSRD's pricing impact is weak.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本ではSSBJ開示が始まるが、本論文は開示規制が株価に与える影響を厳密に評価する手法を示しており、日本の開示制度設計や企業の情報開示戦略に示唆を与える。特に、開示義務の経済的効果を過大評価しないための診断手法は、日本の政策評価にも応用可能。

In the global GX context

This paper provides rigorous evidence on the market impact of mandatory sustainability disclosure, relevant to global debates on CSRD, ISSB, and SEC climate rules. Its diagnostic framework helps distinguish true regulatory effects from spurious correlations, informing policymakers and researchers on the effectiveness of disclosure mandates.

👥 読者別の含意

🔬研究者:Provides a robust methodological framework for evaluating the market impact of disclosure regulations, with diagnostics to validate causal claims.

🏢実務担当者:Offers insights into how markets may react to mandatory ESG disclosure, helping companies anticipate investor responses and communication strategies.

🏛政策担当者:Highlights the importance of rigorous evaluation of disclosure mandates, suggesting that CSRD may not have immediate stock price effects, informing future regulatory impact assessments.

📄 Abstract（原文）

The Corporate Sustainability Reporting Directive (CSRD) extends mandatory, assured and standardised sustainability reporting to a European reporting population several times larger than that of its predecessor, on the premise that such disclosure is priced by capital markets. This paper examines whether equity prices responded to the five legislative and standard-setting milestones through which the mandate became public between April 2021 and July 2023. German DAX constituents falling within the scope of Article 19a are compared with matched S&P 500 firms, using an annual difference-in-differences design and a daily market model event study. The annual estimator yields a positive and significant coefficient of +0.204 that is robust to alternative specifications, standard error corrections and influence diagnostics. Four diagnostics nevertheless indicate that it does not identify a regulatory effect: the same design applied to year pairs containing no CSRD or ESRS event yields estimates of comparable magnitude and mixed sign; parallel pre-trends are rejected; the coefficient is concentrated among poorly matched firm pairs and falls to +0.046 once a caliper is imposed; and the design is underpowered for effects of the magnitude it reports. The event study, which measures each firm against its own home market and therefore does not rely on the cross-country comparison, detects no abnormal return at any milestone once multiple testing and cross-sectional dependence are taken into account: the cumulative 3-day reaction across all five events is +0.8 percentage points, with a 95% confidence interval of [−2.5, +4.0], which excludes a repricing of the magnitude the annual estimate implies. The paper contributes a set of design diagnostics that distinguish an identified estimate from one that is merely stable, and shows that the two-country annual comparisons common in this literature do not survive them.

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