Paul M. Guest

The impact of board size on firm performance: evidence from the UK

We examine the impact of board size on firm performance for a large sample of 2746 UK listed firms over 1981–2002. The UK provides an interesting institutional setting, because UK boards play a weak monitoring role and therefore any negative effect of large board size is likely to reflect the malfunction of the boards advisory rather than monitoring role. We find that board size has a strong negative impact on profitability, Tobins Q and share returns. This result is robust across econometric models that control for different types of endogeneity. We find no evidence that firm characteristics that determine board size in the UK lead to a more positive board size–firm performance relation. In contrast, we find that the negative relation is strongest for large firms, which tend to have larger boards. Overall, our evidence supports the argument that problems of poor communication and decision-making undermine the effectiveness of large boards.

UK Corporate Governance and Takeover Performance

This chapter addresses the changing nature of corporate governance in the United Kingdom over recent decades and examines whether these changes have had an impact on the UK market for corporate control. The disappointing outcomes for acquiring company shareholders in the majority of corporate acquisitions, public discontent with some pay deals for top executives and some high profile corporate scandals led in the early 1990s to a call for governance reform. The scrutiny of governance in UK companies has intensified since the publication of the Cadbury Report in 1992 and has resulted in calls for changes in the size, composition and role of boards of directors, in the role of institutional shareholders, the remuneration and appointment of executives, and in legal and accounting regulations. We review the background to these changes and the consequences of the changes since 1990 for governance structures. Finally, we examine whether these changes have affected takeover performance in recent years. Our analysis is specific to the institutional circumstances of the UK although we refer where appropriate to takeover studies in other countries.