Australia's ASX Ltd., the world's worst-performing stock exchange operator, has appointed Anthony Attia as its new chief executive. Attia faces the immediate challenge of rebuilding trust with regulators and investors after the exchange confessed to misleading claims about its troubled CHESS technology upgrade. His predecessor departed amid heightened scrutiny over technology spending.

Attia, with nearly three decades of experience in exchange operations across the US and Europe, brings technical expertise to the role. He must navigate delicate relationships with Australia's securities watchdog and the Reserve Bank of Australia, which flagged serious consequences from the ASX's governance and risk management failures. The exchange has already made some board changes and is revamping its transformation agenda.

This appointment comes as the ASX's stock has plunged over 30% in five years, making it a significant laggard among listed exchange operators. Attia's compensation package reportedly includes significant bonuses tied to performance, but his ultimate success hinges on appeasing regulators and successfully overhauling the exchange's core systems, particularly the CHESS platform. His tenure will be a critical test for Australia's capital markets.