The dominance of the Big Four in auditing the Straits Times Index is often defended as a necessary byproduct of the scale and complexity inherent in blue-chip companies. Large, multinational corporations require auditors with extensive global networks, deep industry-specific expertise, and the capacity to handle massive, cross-border financial operations. Proponents argue that the Big Four provide a level of institutional reliability and risk management that is essential for maintaining the integrity of Singapore’s capital markets and ensuring investor confidence on a global stage.
For major listed companies, the audit process is not merely a compliance exercise but a critical component of their financial reporting infrastructure. The Big Four firms invest heavily in technology, talent, and regulatory compliance, allowing them to navigate the increasingly complex accounting standards and ESG reporting requirements that modern investors demand. By relying on these established global networks, STI companies can provide a consistent standard of financial disclosure that is recognized and trusted by international institutional investors.
Furthermore, the concentration of audit mandates is seen as a reflection of market efficiency rather than a failure of competition. These firms have built decades of experience in handling the specific needs of large-cap entities, creating a 'track record' that mid-tier firms struggle to replicate. For a company listed on the STI, the reputational risk of an audit failure is immense, making the choice of a globally recognized auditor a prudent decision to protect shareholder value and ensure the company remains a stable 'going concern.'