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This paper aims to provide insight into how environmental information is reflected in the market value of listed Italian companies. In particular, it investigates the value relevance of voluntary environmental information disclosed by companies and the influence of environmental policies assurance.

The method used is the accounting-based valuation model used by Cormier and Magnan (2007), analogue to the one developed by Ohlson (1995), which considers market value of equity as a function of book value, accounting earnings and environmental indicators as provided by Bloomberg. The analysis in this paper is based on the environmental disclosure score (i.e. proxy of a company’s transparency in reporting environmental information) and the assurance practice (i.e. whether or not the company’s environmental policies were subject to an independent assessment for the reporting period).

Results partially support initial conjectures, i.e. the environmental voluntary disclosure represents value-relevant information positively correlated with firms’ market value. Furthermore, when such information is subject to an independent assessment for the reporting period, an incremental benefit deriving from the assurance of such information cannot be found. This is similar to the findings of Cho et al. (2014), i.e. the market perceptions on assurance may need to be developed before the environmental report assurance market in Italy can develop.

Limitations are related to the small sample located in a single country, meaning that results may not be generalisable. The implications are that other methods may provide further value, but these may need to be based either on different data or larger samples (i.e. cross-country analysis).

The increasing importance of environmental issues for economic decision-making and the presence of ethical investors create incentives for environmental information disclosure, which is becoming increasingly significant for comprehensive firm valuation. However, for this information to serve its role, disclosure must be credible. Hence, there are many companies that resort to voluntary assurance of environmental policies, motivated by a need to demonstrate credibility with external stakeholders. Notwithstanding, the influence of verification practice over environmental disclosure on a low regulation country has not yet been completely explored. This paper aims to fill this gap.

Financial assurance rules, also known as financial responsibility or bonding requirements, foster cost internalization by requiring potential polluters to demonstrate the financial resources necessary to compensate for environmental damage that may arise in the future. Accordingly, assurance is an important complement to liability rules, restoration obligations, and other regulatory compliance requirements. The paper reviews the need for assurance, given the prevalence of abandoned environmental obligations, and assesses the implementation of assurance rules in the United States. From the standpoint of both legal effectiveness and economic efficiency, assurance rules can be improved. On the whole, however, cost recovery, deterrence, and enforcement are significantly improved by the presence of existing assurance regulations.

The purpose of this study is to extend existing knowledge on the determinants of sustainability report (SR) assurance practices. Four different theories – stakeholder theory, institutional theory, signaling theory and legitimacy theory – are used to formulate several hypotheses regarding the main factors that can influence a company’s decision to assure its SRs.

Using a sample of 417 listed organizations based in different European countries over five years, the effects of stakeholder commitment, country orientation toward sustainability, firm environmental performance and business ethics controversies on the decision to assure SRs are assessed.

The results show that a company’s decision to assure its SRs is motivated by the need to maintain good relations with its stakeholders (which is in line with stakeholder theory and legitimacy theory), as well as by the willingness to signal their sustainability performance (which is in line with signaling theory) and to gain legitimacy. On the contrary, business ethics controversies do not seem to be relevant to a company’s assurance practices.

This paper provides new insights into the influence that social, environmental and institutional factors have on assurance strategies. New factors that previous research does not investigate – environmental performance, business ethics controversies and corporate governance – are tested. Factors that are already investigated in the literature are considered from an original perspective of introducing alternative measures (e.g. for the scope of national sustainability policies).

Although the association between sustainability assurance (SA) quality and firm value has been examined in previous studies, the moderating relationship is novel in this study and highlights the effect of corporate environmental sustainability performance (CESP) on the relationship between SA quality and firm value. This study aims to examine whether such an effect is strengthened or weakened by eco-efficiency, as measured by ISO 14001 certification, aggregate CESP score and each individual dimension of CESP (emission reduction [ER], resource reduction [RR] and product innovation [PI]).

The sample includes 40 companies in Euronext Paris with the largest market capitalisations (the Cotation Assistée en Continu 40 [CAC 40] index) from 2010 to 2020. The authors apply the feasible generalised least squares regression technique to estimate all the regression models. Because observed associations may be biased by reverse causation or self-selection, the authors use the instrumental variable approach and Heckman two-stage estimation.

The results show that SA quality had a positive and significant effect on firm value. Second, the authors demonstrate that CESP, as assessed by ISO 14001 certification, has a stronger interaction with assurance quality and acting as a moderator variable. Using the ASSET4 scores, an alternative proxy for CESP, the authors find inconsistent evidence regarding the impact of CESP attributes. The CESP and ER scores are homogeneous and have a positive effect on firm value. However, the PI and RR CESP attributes are not homogenous and do not have the same interactive effect on firm value. The results are robust to the use of an instrumental variable approach and the Heckman two-stage estimation procedure.

Policy implications: Regulators may be interested in the findings when considering current and future assurance requirements for sustainability reporting, and shareholders when considering SA as an investment choice criterion. The insights into and enhanced understanding of the incentives for obtaining high SA quality can help policymakers develop effective policies and initiatives for SA. Considering the possible improvements in sustainability performance when obtaining a high level of sustainability verification, governments need to consider mandating SA.

Firms receive clear confirmation of the importance of investing in SA quality. Financial markets do not evaluate SA dichotomously but reward companies with higher SA quality because of the greater credibility it provides. Firms should allocate a significant percentage of their annual budgets and other relevant resources to environmental training and development programmes to improve and maintain environmental performance. If they care about environmental issues, they must announce this by issuing sustainability reports and seeking assurance of the information disclosed. High-quality assurance not only has a significant effect on investors’ investment reliability judgements but also the perceived credibility of environmental performance fully moderates the effect of assurance on these judgements.

This study has social implications; the authors find that the French market rewards firms that provide a high-quality assurance to guarantee the integrity of their sustainability reports. Therefore, by incorporating environmental sustainability into their financial goals, a better assurance ultimately will urge firms to move from green washing to strategic goals, which is beneficial for society. Further, firms that focus on sustainability as part of their business strategy may attract employees who engage in green behaviours at work and create a friendlier and productive environment because it gives meaning to the work they do and keeps them engaged to the level needed to perform their jobs capably.

This study contributes to the literature by re-examining the relationship between SA quality and firm value. It also provides new evidence on the moderating effect of CESP on the SA quality–firm value nexus. Specifically, it explores the joint effect of credibility and eco-efficiency on market confidence in sustainability information.

Compiled by K.G.B. Bakewell covering the following journals published by MCB University Press: Facilities Volumes 8‐18; Journal of Property Investment & Finance Volumes 8‐18; Property Management Volumes 8‐18; Structural Survey Volumes 8‐18.

Index by subjects, compiled by K.G.B. Bakewell covering the following journals: Facilities Volumes 8‐18; Journal of Property Investment & Finance Volumes 8‐18; Property Management Volumes 8‐18; Structural Survey Volumes 8‐18.

Compiled by K.G.B. Bakewell covering the following journals published by MCB University Press: Facilities Volumes 8‐18; Journal of Property Investment & Finance Volumes 8‐18; Property Management Volumes 8‐18; Structural Survey Volumes 8‐18.

Compiled by K.G.B. Bakewell covering the following journals published by MCB University Press: Facilities Volumes 8‐18; Journal of Property Investment & Finance Volumes 8‐18; Property Management Volumes 8‐18; Structural Survey Volumes 8‐18.

Index by subjects, compiled by K.G.B. Bakewell covering the following journals: Facilities Volumes 8‐17; Journal of Property Investment & Finance Volumes 8‐17; Property Management Volumes 8‐17; Structural Survey Volumes 8‐17.

Compiled by K.G.B. Bakewell covering the following journals published by MCB University Press: Facilities Volumes 8‐17; Journal of Property Investment & Finance Volumes 8‐17; Property Management Volumes 8‐17; Structural Survey Volumes 8‐17.