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Event-Study of ESG Controversies on FTSE Returns

Market valuation adjustments surrounding corporate sustainability failures reflect the rapid pricing of non-financial risks under information asymmetry. Short-horizon return dynamics isolate how unexpected governance shocks alter investor sentiment, cost of capital, and equity market equilibrium. Event-study architectures provide rigorous empirical measurement of abnormal returns, demonstrating the conditional financial materiality of corporate social misconduct.

Goal of work

How do ESG controversies affect the short-horizon abnormal returns of FTSE-listed equities?

Methodology

Event-study framework evaluating cumulative abnormal returns from published empirical equity datasets and multi-factor pricing models.

Scientific novelty

Synthesises corporate governance moderation with event-study return anomalies to evaluate non-linear risk transmission in UK equities.

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Master's Dissertation

Degree:
Event-Study of ESG Controversies on FTSE Returns

Author:

Group

First M. Last

Advisor:

Dr. First Last

City, 2026

Contents

Introduction
Theoretical Foundations of ESG Pricing and Market Reaction
Stakeholder and Signalling Theories in Capital Markets
Value Destruction versus Governance Scrutiny Hypotheses
Asymmetric Information and Non-Financial Risk Transmission
Event-Study Methodology and FTSE Benchmark Design
Event Window Specification and Estimation Models
Measuring Abnormal Returns and Cumulative Valuation Deviations
Robustness Diagnostics and Cross-Sectional Controls
Empirical Analysis of Market Returns Across Controversy Dimensions
Environmental and Social Incident Announcements
Governance Failures and Short-Horizon Price Corrections
Sectoral Heterogeneity and Market Capitalisation Effects
Discussion of Market Efficiency and Portfolio Implications
Synthesis of Theoretical Predictions and Return Anomalies
Practical Implications for Institutional Risk Management
Research Limitations and Directions for Capital Market Research
Conclusion
Bibliography

Introduction

Capital markets increasingly treat environmental, social, and governance controversies as material information signals that fundamentally alter equity valuation and corporate risk profiles across leading equity benchmarks. Under stakeholder and signalling frameworks, adverse sustainability disclosures expose listed firms to severe reputational penalties and heightened regulatory scrutiny, prompting swift re-evaluations of discounted cash flows and investor risk premia within contemporary portfolio management [1].

Within developed equity markets, the transmission mechanism connecting sudden corporate misconduct disclosures to abnormal equity returns reveals substantial structural friction. Existing empirical scholarship demonstrates divergent capital market responses, depending on whether institutional participants interpret governance controversies as systemic internal control failures or as transient informational shocks that do not fundamentally impair long-term operational profitability [2].

Standard event-study frameworks facilitate the isolation of abnormal market returns around discrete corporate controversy announcements, systematically decoupling market-wide volatility from firm-specific sustainability shocks. Analysing cumulative abnormal returns across multiple event windows clarifies whether heightened public scrutiny alleviates information opacity or triggers acute asymmetric downside valuation adjustments across diverse corporate sectors [7].

Evaluating controversy-induced return dynamics provides institutional asset managers and statutory oversight bodies with rigorous empirical benchmarks for pricing non-financial corporate risks. Synthesising multi-factor asset pricing specifications with short-horizon event analytics resolves enduring theoretical tensions regarding the pricing efficiency of environmental and social governance shocks in modern British equity markets [8].

Synthesis of Theoretical Predictions and Return Anomalies

The empirical findings provide critical nuance to stakeholder and signaling frameworks within sustainable finance. While foundational literature posits that corporate sustainability practices mitigate non-financial risks and contribute to positive equity valuation through multi-factor pricing dynamics (The Impact of Environmental, Social, and Governance (ESG) Performance on Stock Returns: An Empirical Analysis, 2025), negative non-financial shocks produce complex market behaviors. Specifically, distinct stakeholder criteria operate unevenly, demonstrating that generalized non-stakeholder social issues can depress operating performance and returns while core stakeholder governance preserves resilience (The Relationship between Environmental Social Governance Factors and Stock Returns, 2010). Furthermore, recent evidence suggests that ESG controversies may foster heightened external scrutiny and decrease opacity rather than immediately triggering extreme downside valuation collapse (ESG Controversies and Stock Price Crash Risk: The Governance Shield, 2026). This synthesis identifies a critical research gap: prevailing empirical architectures often evaluate aggregated sustainability ratings rather than isolating the short-horizon abnormal returns generated by unexpected controversy shocks in FTSE equities. Disentangling incident-specific announcements from broad ESG performance metrics resolves theoretical contradictions regarding market efficiency and stakeholder materiality. Nonetheless, important limitations remain. Unobserved idiosyncratic factors and broader market noise limit the explanatory capacity of cross-sectional return regressions. Furthermore, commercial scoring delays and varied controversy disclosure timing constrain the precise measurement of intraday informational transmission.

References

  1. The Relationship between Environmental Social Governance Factors and Stock Returns
    John R. Evans, Dinusha Peiris
    DOI Link
  2. The Impact of Environmental, Social, and Governance (ESG) Performance on Stock Returns: An Empirical Analysis
    Soumya Upadhyay
    DOI Link
  3. The Correlation of ESG Ratings and Abnormal Returns: An Event Study Using Machine Learning
    Dominic Strube, Christian Daase
    DOI Link
  4. Political affiliation and abnormal stock returns around elections: an event study from Bangladesh
    Al Amin, Raihan Sobhan
  5. EXPLORING ENVIRONMENTAL, SOCIAL, AND GOVERNANCE (ESG) AND FINANCIAL INFLUENCES ON STOCK RETURNS: EVIDENCE FROM ASEAN
    Heldy Mulyadi, Musviyanti
  6. Does <scp>ESG</scp> investing pay‐off? An analysis of the <scp>Eurozone</scp> area before and during the <scp>Covid</scp>‐19 pandemic
    Dimitrios Asteriou, Keith Pılbeam, William Pouliot
  7. ESG Controversies and Stock Price Crash Risk: The Governance Shield
    Muhammad Umar Shahbaz
  8. Controversies in ESG Investment Performance: Returns, Risks, and Market Biases
    Ye Jiang

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