ASX Ltd. shares dropped 2.4% in Sydney trading, marking their worst single-day decline in two months, after the exchange operator revealed CEO Helen Lofthouse will depart in May. The surprise leadership change comes amid an ongoing regulatory investigation and operational challenges at Australia's primary stock market.

Lofthouse's exit follows a turbulent tenure that included overseeing a failed blockchain settlement system upgrade, which drew scrutiny from the Australian Securities and Investments Commission. The company provided no explanation for her departure and didn't identify a replacement, raising concerns about strategic continuity.

The leadership vacuum adds pressure as ASX faces competitive threats from alternative trading platforms and works to restore confidence after last year's technology debacle. Investors appear skeptical about near-term stability - the exchange's shares have lagged Australia's benchmark index by 9% over the past six months.