Dissertation – Corporate Governance and Firm Performance Among ASX-Listed Companies

Abstract

This dissertation extract examines the relationship between board-level governance mechanisms and the performance of firms listed on the Australian Securities Exchange (ASX). Using a hypothetical balanced panel of 150 non-financial ASX-listed firms observed over the 2016 to 2023 period (1,200 firm-year observations), the study estimates two-way fixed-effects regressions relating board independence, board gender diversity and CEO duality to accounting performance (return on assets) and market valuation (Tobin’s Q). The results indicate that board independence and gender diversity are positively and significantly associated with both performance measures, whereas CEO duality is associated with weaker performance. Firm size and leverage behave as anticipated. The findings are broadly consistent with agency theory and with the monitoring rationale that underpins the ASX Corporate Governance Council’s Principles and Recommendations. The study contributes Australian panel evidence to a literature dominated by North American samples and offers implications for boards, the Australian Institute of Company Directors (AICD) and regulators such as the Australian Securities and Investments Commission (ASIC).

Introduction

The separation of ownership and control in the modern listed company creates a governance problem: shareholders delegate authority to managers whose interests may diverge from their own (Jensen & Meckling 1976). Boards are the primary internal mechanism for containing this agency conflict, and the structural attributes of the board, its independence, composition and leadership arrangements, are therefore central to how effectively capital is stewarded (Fama & Jensen 1983). In Australia, these attributes are shaped by a distinctive regulatory architecture. The ASX Corporate Governance Council’s Principles and Recommendations operate on an “if not, why not” disclosure basis and encourage a majority-independent board and the separation of the roles of chair and chief executive (ASX Corporate Governance Council 2019). These expectations sit alongside the statutory duties of care, diligence and good faith imposed on directors under the Corporations Act 2001 (Cth), and alongside sustained pressure from the AICD for female representation on boards to reach at least 30 per cent.

Despite this policy attention, the empirical evidence linking governance structure to firm performance remains contested, and much of it is drawn from United States samples whose institutional setting differs materially from Australia’s. Australian panel evidence, in particular, is comparatively thin. This study addresses that gap by analysing how three widely regulated governance attributes relate to the performance of ASX-listed firms. The aim is to estimate the direction and magnitude of these associations while controlling for firm characteristics, and to interpret the results against the Australian governance framework. The scope is limited to non-financial firms and to two performance measures, one accounting-based and one market-based. The study is guided by three research questions:

1. RQ1. To what extent is board independence associated with the accounting and market performance of ASX-listed firms?
2. RQ2. Does board gender diversity relate to the performance of ASX-listed firms?
3. RQ3. What is the association between CEO duality and firm performance in the Australian context?

Literature Review

Agency theory provides the dominant lens for this field. Because managers do not bear the full wealth consequences of their decisions, monitoring by an informed and independent board is expected to reduce private benefit extraction and improve outcomes for owners (Jensen & Meckling 1976; Fama & Jensen 1983). Independent directors, lacking employment or material commercial ties to management, are theorised to monitor more objectively, and Nguyen and Nielsen (2010) report that the sudden death of an independent director destroys shareholder value, which they read as evidence of genuine monitoring benefit. The empirical record is nonetheless mixed: Bhagat and Bolton (2008) find that the relationship between independence and performance is sensitive to how performance and governance are measured.

The evidence on board gender diversity has strengthened over the past decade. Adams and Ferreira (2009) show that female directors have stronger attendance records and are more likely to sit on monitoring committees, although they caution that mandated diversity can reduce value in already well-governed firms. Carter, Simkins and Simpson (2003) and Terjesen, Couto and Francisco (2016) report positive associations between board diversity and firm value across a range of settings. In Australia, the policy salience of this question is high: the Workplace Gender Equality Agency (WGEA 2023) documents persistent gaps in senior representation, and the AICD (2022) continues to track progress toward its 30 per cent target.

CEO duality, where a single person serves as both chief executive and board chair, is the third focus. Agency theory regards duality as a concentration of power that weakens the board’s capacity to monitor, whereas stewardship theory argues that unified leadership improves decisiveness. The ASX Corporate Governance Council (2019) recommends separation of the roles, and duality is consequently uncommon among large Australian firms. Board size is a related consideration: Yermack (1996) documents an inverse relationship between board size and market valuation, attributing it to coordination costs in larger boards.

Australian evidence is instructive but limited. Kiel and Nicholson (2003) find that board composition relationships in Australian firms do not map neatly onto United States findings, while Christensen, Kent and Stewart (2010) and Pham, Suchard and Zein (2011) both show that measured effects shift depending on whether accounting or market-based metrics are used. The gap this study addresses is the relative scarcity of recent, multi-year panel evidence examining independence, diversity and duality jointly for the ASX.

Methodology

The study adopts a quantitative, longitudinal design. The sample comprises 150 non-financial firms drawn from the ASX 300, observed annually over the eight financial years from 2016 to 2023, yielding a balanced panel of 1,200 firm-year observations. Financial firms are excluded because their capital structures make accounting ratios difficult to compare. Governance variables are collected from annual report corporate governance statements, and accounting variables are computed from financial statements prepared under the standards issued by the Australian Accounting Standards Board (AASB), which supports comparability of the return-on-assets measure across firms and years.

Performance is captured by two dependent variables. Return on assets (ROA) is net profit after tax divided by total assets and represents accounting performance. Tobin’s Q, the market value of equity plus the book value of debt divided by total assets, represents market-based valuation. The explanatory variables are board independence (the percentage of directors classified as independent), gender diversity (the percentage of female directors) and CEO duality (a binary indicator equal to one where the chief executive also chairs the board). Board size, firm size (the natural logarithm of total assets), leverage (total debt to total assets) and firm age are included as controls. The conceptual model that links these constructs is set out in Figure 1.

The estimating equation for each performance measure takes the form Performance(it) = β0 + β1 BoardIndependence(it) + β2 GenderDiversity(it) + β3 CEODuality(it) + β4 Controls(it) + μ(i) + λ(t) + ε(it), where μ(i) captures firm fixed effects and λ(t) captures year fixed effects. A Hausman test favoured the fixed-effects specification over random effects, so firm and year effects are retained throughout; this controls for time-invariant firm heterogeneity and for common yearly shocks such as macroeconomic conditions. Standard errors are clustered by firm, and multicollinearity is not a material concern, with all variance inflation factors below 2.5.

Findings

Table 1 reports the descriptive statistics. The average firm records an ROA of 6.42 per cent and a Tobin’s Q of 1.68, indicating a typical valuation above book value. Boards are, on average, 58.3 per cent independent and 28.7 per cent female, the latter figure sitting just below the 30 per cent benchmark promoted by the AICD. CEO duality appears in only 14 per cent of firm-years, reflecting the ASX Corporate Governance Council’s recommendation that the roles of chair and chief executive be separated.

Table 2 presents the two-way fixed-effects regression results. In the ROA model, board independence carries a positive and statistically significant coefficient (0.087, p < 0.05), as does gender diversity (0.112, p < 0.01), while CEO duality is negative and significant (-1.884, p < 0.05). The same pattern of signs holds for Tobin’s Q, confirming that the associations are not an artefact of a single performance measure. Firm size is positively related to ROA but negatively related to Tobin’s Q, a common finding for larger, more mature firms with lower embedded growth expectations.

The economic magnitude of these coefficients is best appreciated through a worked interpretation. In the ROA model, the board independence coefficient of 0.087 means that a one percentage point increase in the proportion of independent directors is associated with a 0.087 percentage point increase in ROA, holding other variables constant. Moving a firm from the first quartile of independence (approximately 45 per cent) to the third quartile (approximately 72 per cent), a spread of 27 percentage points, implies a predicted ROA difference of 0.087 x 27 = 2.35 percentage points. The gender diversity effect is of a similar order: a ten percentage point rise in female representation is associated with a 0.112 x 10 = 1.12 percentage point increase in ROA. CEO duality, by contrast, is costly; firms in which the chief executive also chairs the board record ROA that is, on average, 1.88 percentage points lower than otherwise comparable firms with separated roles.

Discussion

The findings offer a reasonably coherent answer to the three research questions. In relation to RQ1, board independence is positively associated with both accounting and market performance, which supports the monitoring rationale advanced by agency theory and echoes the value-relevance of independent directors reported by Nguyen and Nielsen (2010). The result also lends empirical support to the ASX Corporate Governance Council’s recommendation of a majority-independent board, suggesting that the “if not, why not” regime is aligned with the interests of shareholders rather than being a compliance formality.

Turning to RQ2, the positive and significant gender diversity coefficient indicates that broader board composition is associated with stronger performance in the Australian setting. This is consistent with the direction reported by Carter, Simkins and Simpson (2003) and Terjesen, Couto and Francisco (2016), and it provides an evidence-based case for the diversity objectives championed by the AICD (2022) and monitored, at the wider workforce level, by WGEA (2023). The sample mean of 28.7 per cent, just short of the 30 per cent target, suggests that the marginal firm still has room to realise these benefits. On RQ3, the negative duality coefficient supports the separation of the chair and chief executive roles; the low prevalence of duality in the sample indicates that most Australian boards already follow this recommendation, and the result implies that the minority which do not may be leaving performance on the table.

These associations carry practical implications. For directors, the results reinforce that structural governance choices are linked to measurable outcomes, a point that intersects with the duties of care and diligence codified in the Corporations Act 2001 (Cth). For regulators, the evidence supports ASIC’s continued attention to board effectiveness and the oversight of non-financial risk (ASIC 2021). It should be stressed, however, that the estimates describe associations rather than causation, and governance quality may be correlated with unobserved managerial ability.

Conclusion

This extract has examined how board independence, gender diversity and CEO duality relate to the performance of ASX-listed firms using a hypothetical eight-year panel and two-way fixed-effects estimation. Independence and diversity are positively and significantly associated with both ROA and Tobin’s Q, while CEO duality is associated with weaker performance, patterns that are congruent with agency theory and with the settled recommendations of the ASX Corporate Governance Council. The study contributes recent Australian panel evidence to a field dominated by overseas samples, using a design that jointly models three regulated governance attributes.

Several limitations qualify these conclusions. The data are a constructed illustration rather than an audited dataset, the fixed-effects approach cannot fully resolve endogeneity arising from reverse causality or omitted variables, and the analysis is confined to non-financial firms and to two performance measures. Future research could employ instrumental-variable or dynamic panel estimators to strengthen causal inference and incorporate further governance attributes such as committee structure, director tenure and ownership concentration. Even so, the results provide a discipline-appropriate account of how board structure and firm performance are connected in the Australian market.

References

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Australian Institute of Company Directors (AICD) 2022, Board Diversity Report, Australian Institute of Company Directors, Sydney.

Australian Securities and Investments Commission (ASIC) 2021, Director and officer oversight of non-financial risk, Australian Securities and Investments Commission, Sydney.

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