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The departure of Mr Yates, alongside the resignation of audit and assurance head Julian McPherson, marks a escalation in a scandal that has engulfed the Big Four accounting firm and drawn intense scrutiny from Australian regulators.

The crisis stems from allegations by a former executive that KPMG partners improperly accessed and shared highly sensitive corporate information to secure lucrative new contracts. Confidential board documents and audit data from major clients, including property developer Lendlease and telecommunications firm Optus, were allegedly leaked internally to assist KPMG teams bidding for work with rival businesses such as Westpac, Dexus, and Telstra, The Guardian reports.

Initially, KPMG management dismissed the whistleblower’s disclosures as a low-level workplace grievance, concluding that the shared documents offered no competitive advantage. However, the recent discovery of a severe breach involving Optus and Telstra forced the firm to abandon its initial findings.

KPMG chairman Martin Sheppard has since issued an unreserved apology to the whistleblower and affected clients, admitting that the original internal reviews lacked the necessary rigour.

The fallout has triggered multiple inquiries. The Australian Securities and Investments Commission has launched an investigation into the conduct of specific registered auditors involved in the matter, whilst a parliamentary committee is preparing to call current and former KPMG personnel to testify.

In a bid to restore market confidence, KPMG has appointed Stan Stavros as interim chief executive and engaged external specialists to conduct an independent review of its corporate culture and internal reporting protocols.