Board monitoring and the informational content of ESG performance

Purpose This study aims to examine whether improvements in environmental, social and governance (ESG) performance are associated with subsequent realised firm outcomes and whether board monitoring conditions these relationships. Using UK FTSE 350 firms, the study evaluates whether year-on-year ESG improvements predict ESG controversies, environmental incidents, investment inefficiency and future operating performance. It further investigates whether stronger board monitoring increases the extent to which ESG improvements are associated with favourable subsequent outcomes. Design/methodology/approach The study uses an unbalanced panel of 314 FTSE 350 firms, comprising 4,396 firm-year observations from 2010 to 2024, with ESG, governance and financial data from LSEG. Panel regressions include industry and year fixed effects with firm-clustered standard errors. Board monitoring is measured using a composite index based on board independence, CEO-chair role separation and board ESG expertise. Robustness tests include disaggregated governance components, an ESG measure excluding the governance pillar, firm fixed effects, lagged specifications and multicollinearity diagnostics. Findings ESG improvements are not consistently associated with subsequent ESG controversies, investment inefficiency or future operating performance. For environmental incidents, however, the interaction between ESG improvement and board monitoring is negative and statistically significant, indicating that the association becomes more favourable as monitoring strengthens. Component-level analyses show similar negative moderation for board independence, CEO-chair separation and ESG expertise, although statistical strength varies. The result also remains when the governance pillar is excluded from the ESG measure. Lagged specifications provide more limited evidence, indicating that the relationship is outcome-specific and not persistent across all time horizons. Research limitations/implications The study focuses on UK listed firms operating within a relatively strong governance environment, which may limit generalisability to weaker institutional settings. The board monitoring index uses equal weighting, although component-level tests reduce concerns regarding this construction. The outcome measures capture specific dimensions of realised firm behaviour and do not directly measure greenwashing, managerial intent or board detection processes. Future research could examine alternative governance measures, weighting schemes, outcome intensity, other institutional settings and additional mechanisms such as ownership structure, executive incentives and external assurance. Practical implications The findings suggest that ESG score improvements should not be interpreted in isolation as evidence of substantive operational change. For boards, the results highlight the importance of effective oversight in linking ESG initiatives to underlying business practices, particularly in environmentally sensitive areas. For investors, ESG changes may be more informative when considered alongside governance characteristics. For regulators and standard setters, the evidence suggests that enhanced ESG disclosure alone may be insufficient unless supported by governance structures that promote accountability and substantive implementation. Social implications The study has broader implications for corporate accountability and stakeholder confidence in ESG information. By showing that ESG improvements are not uniformly associated with realised outcomes, the findings reinforce the need for stronger governance and scrutiny over how sustainability claims relate to actual corporate behaviour. More credible alignment between ESG performance and operational conduct may improve the usefulness of sustainability information for employees, communities, investors and other stakeholders and may help reduce the risk that symbolic improvements are interpreted as evidence of substantive social or environmental progress. Originality/value The study contributes by shifting attention from ESG levels to the informational content of ESG improvements and their association with subsequent realised outcomes. It further shows that this relationship is conditional on board monitoring and differs across outcome types. Unlike studies focused mainly on ESG disclosure or contemporaneous firm value, this study links changes in ESG performance to future adverse events, investment efficiency and operating performance. It also provides new evidence that the environmental-outcome relationship is not solely driven by the construction of the composite monitoring index or mechanical overlap with the ESG governance pillar.