This study investigated the impact of sustainability reporting on the operational performance of environmentally

sensitive firms listed on the Nigerian Exchange Group (NGX). Employing an ex post facto research design, the

study utilized secondary data derived from the annual and sustainability reports of eight firms between 2019 and

2024. Environmental, social, and governance (ESG) disclosure indices were developed via content analysis,

utilizing a binary scoring methodology aligned with the Global Reporting Initiative (GRI) framework. Analytical

procedures included descriptive statistics, correlation analysis, panel least squares regression, heteroskedasticity

Nigeria remains limited. The study recommends that firms move beyond mere disclosure compliance, strengthen

governance frameworks, and align social investment strategies with core operational objectives.

Keywords: Environment Reporting, Social Reporting, Governance Reporting, Operating Margin Ratio, GRI,

Nigeria

Sustainability reporting has emerged as a notable development that has gained traction in recent years. A

multitude of firms currently generate annual sustainability reports, accompanied by a diverse range of ratings

and standards employed in the evaluation process. Firms opt to produce a sustainability report for a multitude of

reasons, yet the fundamental motivations appear to revolve around the principles of transparency and

accountability (Umar, Mustapha & Yahaya, 2021).

these firms to successfully and efficiently achieve their long-term goals, they must adequately adjust to their

environments.

Umar et al. (2021) assert that sustainability reports are derived not only from gathered data but also serve as a

mechanism to internalize and reinforce the firm's dedication to sustainable development, which may exhibit the

values and governance model and demonstrate its strategy and its environmental and social impact. The GRI

(2019) revealed that Nigerian companies are not excluded from integrating sustainability in their audited annual

reports, which is linked to the commitments of the global economy and global competitiveness. Elkington

(2004), cited in Umar et al. (2021), explains that sustainability reporting is a form of value reporting in which

organizations publicly communicate their economic, environmental, and social performances. However, these

purposes do not consider the temporal dimension nor the interaction between the different dimensions of

Uwakonye, Osho, & Anucha (2006), Uwuigbe & Jimoh (2012), and Herbert, Nwaorgu, Onyilo, & Iormbagah

(2020), and are linked to pollution, emissions, environmental degradation, and the displacement of community

villagers. Solomon (2020) observed that the company's operations are the primary cause of the environmental

challenge that the world is currently confronting, which is climate change and global warming. Sheharyar (2024)

revealed that the Global Reporting Initiative (GRI) has been recognized as the best practice for reporting the

environmental and social impacts of firms. Sustainability reporting presents insights into a firm's positive or

negative contributions to sustainable development. A KPMG (2020) survey carried out revealed that 90 percent

of the 250 largest global companies now report their sustainability reports compared to just 12% in 1993. The

survey indicated significant improvement in the sustainability reporting, and in no time, there will be a

convergence of reporting standards for non-financial reporting.

not to belittle Nigerian companies, the message is that, like their financial reports, actions and activities affecting

sustainability should receive primary attention to make sustainability reporting more desirable and relevant.

The Niger Delta oil-rich region has suffered from oil spillage, environmental degradation, and loss of

biodiversity, which have exposed residents of the communities to environmental disasters (Grace, 2021;

Common Dreams, 2023). Therefore, companies must report how their operations have positive and negative

economic, social, and environmental impacts on the community in which they operate and how they intend to

improve the positive aspects and eliminate or improve the negative aspects. The study identified some literature

gaps in the overall review. From the gaps identified after the review of sustainability reporting and financial

performance in Nigeria, prior studies such as Aondoakaa (2015), Ezeokafor & Amahalu (2019), Hebert et al.

(2020), and Umar et al. (2021) showed that measurements of sustainability reporting were not appropriately in

scope of sustainability reporting, often omitting governance reporting and focusing on only the economic,

environmental, and social facets, and restricted the complete use of the GRI index. Second, the literature that

remains published has a strong focus on the financial performance indicators of return on assets, return on equity,

and market value (Ofoegbu and Asogwa, 2020; Yazid et al., 2021; Korolo and Korolo, 2023) and has minimal

consideration of the performance indicators of operations, including the operating margin ratio, that is more

effective in measuring efficiency in core operations. This study aims to address these gaps and use a full GRI-

based index, including the governance reporting, focusing on the performance in operations based on the

operating margin ratio, utilizing the latest data of the years 2019-2024 of environmentally sensitive firms in

Nigeria.

Sustainability reporting is the structured and transparent process of summarising, analysing, and communicating

stakeholders.

Environmental Reporting

The environmental dimension of sustainability refers to the organisation's impact on biological and non-

biological natural systems, which includes ecosystems, land, air, and water. Environmental indicators cover input

performance (such as materials, energy, and water) and output performance (such as emissions, effluent, and

waste). They also cover performance related to biodiversity, environmental compliance, and other related

information (such as environmental expenditure and the impact of products and services). Social performance

indicators focus on the impact of organisations on the local communities in which they operate and how they

manage and mediate risks that may arise from interactions with other social institutions.

Ohidoa, Omokhudu, and Oserogho (2016), as cited in Etale et al. (2021), assert that companies, particularly

activity cannot exist under such conditions. Herbert et al. (2020) stressed that the serious health hazards normally

associated with oil and gas exploration activities and the environmental, economic, and social makeup of

indigenous communities in oil-producing areas are also negatively affected.

Social Reporting

Social reporting reveals the activities that are associated with social and ecological factors, which provide an

insight into the fulfilment of the firm's social responsibilities to the stakeholders. The work of Najah & Jarboui

(2013) suggested that the firm's social reporting should comprehensively outline the societal and environmental

influences on its business operations. Social reporting has become a strategic focus for companies to ensure that

their daily business operations positively impact the environment. The societal impact could raise stakeholders'

expectations for what firms give to the community, which could be basic healthcare, a conducive learning

and strict regulatory compliance (Solomon, 2020). The governance reporting is embedded with the principles of

corporate governance, like the composition of the board, the rights of shareholders, executive compensation, and

internal control mechanisms, which assist in keeping the stakeholders informed on the decisions being carried

out.

Operational Performance

Operational performance refers to how efficiently a company conducts its core business activities to generate

value, sustain growth, and remain competitive. In the oil and gas sector, operational performance is particularly

critical because of the high capital intensity, environmental costs, and regulatory scrutiny involved.

The operating margin ratio can be defined as the operating income of a firm relative to its total revenue. It

evaluates the firm's profit generated from its business operations preceding the interest consideration and taxes.

It also signifies the proficiency of the firm in handling the production and administrative costs in relation to sales

(Gitman & Zutter, 2015). According to Brigham and Ehrhardt (2017), primary operations are the transformation

Sunny and Apsara (2024) investigate sustainability reporting and financial performance in Bangladesh's 270

firms; the study employs pooled OLS regression. The findings reveal that economic and environmental

sustainability reporting have significant positive relationships with both financial performance measures, while

social sustainability reporting shows no significant impact. Environmental reporting emerges as the strongest

to financial success but not to environmental disclosures. Interestingly, there is a strong and positive correlation

between sustainability disclosures when they are examined as a whole.

Using a content analysis technique, Herbert, Nwaorgu, Onyilo, and Iormbagah (2020) investigated the

 Community development

 Local content initiatives

 Training and development

 Human rights

 Stakeholder engagement

 Diversity

 Education programmes

 Sustainability governance

 Shareholder protection

 Internal controls

 Governance compliance

The operational margin ratio is subject to the proxying of operational performance. These dependent variables

show the adjustment existing in financial value because of sustainability reporting, and the measures employed

in the empirical review were the financial performance measures.

Mathematically, the ratio is expressed as:

Operating Margin Ratio = Operating Income

Revenue ×100

Where Y is the dependent variable which describes operational performance indicators such as;

OPMR = Operational Margin Ratio

ENVRit = Environmental reporting

SOCRit = Social reporting

GOVRit = Governance reporting

FIRA = Firm Age

E is the error term capturing other explanatory variables not explicitly included in the model.

revenue during the study period.

The disparity between the minimum and maximum OPMR values reflects significant variance in operational

performance across the sample.

Regarding sustainability reporting, the firms demonstrated high average disclosure scores. Social reporting

attained the highest mean score, followed by governance and environmental reporting, suggesting a prioritization

of social and governance disclosures over environmental metrics.

Furthermore, the low standard deviations suggest that disclosure practices remained relatively consistent among

the firms throughout the observed period.

Jarque-Bera statistics indicate that most variables follow a normal distribution, as their respective probability

values exceed the 5% significance threshold. Firm age (FIRA) is a notable exception, recording a probability

Source: Eview

The correlation analysis demonstrates a positive relationship between operational performance and

environmental reporting (r = 0.4407, p < 0.05), governance reporting (r = 0.3966, p < 0.05), and social reporting

(r = 0.3221, p < 0.05).

Table 3: Regression Results