Singtel Confirms Talks Over Optus Stake Sale Amid ACMA Legal Action

Singapore Telecommunications (Singtel) confirmed last week that it is in discussions over a potential sale of a minority stake in its Australian subsidiary Optus, a move that comes as the Australian Communications and Media Authority (ACMA) takes Optus to court over a major emergency services outage last year.

The confirmation was made via a stock exchange filing on July 30, the same day ACMA revealed it had commenced proceedings in the Federal Court against Optus Mobile Pty Limited over the September 18, 2025 Triple Zero outage. Triple Zero (000) is Australia's primary emergency service phone number, and the disruption had severe consequences, with four deaths reported and an estimated 600 customers potentially affected.

"We can confirm we are currently in discussions with interested parties, but there is no certainty or assurance that any transaction will occur. Singtel will make an announcement if and when there are any material developments that warrant disclosure," the company stated in the filing.

The development follows an announcement in May in which Singtel said it was "open to working with potential Australian partners that align with its objectives of ensuring that Optus continues to be a strong alternative operator in the industry." The carrier reiterated that intention in last week's filing as it seeks to bring in outside investment while retaining majority control of the asset it has fully owned since acquiring Optus in 2001.

The timing of the stake sale talks is intertwined with Optus's legal troubles. The September 2025 outage was not the carrier's first failure involving emergency call services. In 2023, Optus was fined AU$12 million ($7.93 million) for an outage on November 8 of that year that lasted more than 14 hours. ACMA chair Nerida O'Loughlin emphasized the gravity of the repeat failure, stating: "The recurrence of a major network outage affecting emergency calls so soon after the November 2023 outage is a significant concern and one of the reasons the ACMA has decided to take this matter to court." She added: "The ACMA will not hesitate to take strong enforcement action where alleged telco failures have jeopardized public access to the critical emergency call service."

According to ACMA, Optus breached two legal obligations more than 1,000 times during the September 18, 2025 outage, with each contravention potentially attracting a maximum penalty of AU$250,000 ($176,000). The scale of potential fines, combined with the reputational damage from back-to-back emergency service failures, could influence the valuation and structure of any stake sale Singtel negotiates.

For Singtel, divesting a minority stake in Optus would represent a strategic shift after more than two decades of full ownership. The move is widely seen as a way to unlock capital and share the financial burden of Optus's network investment needs, while still allowing Singtel to maintain strategic control over its Australian operations. Industry observers note that any deal would need to reassure both regulators and the Australian public that Optus's operational resilience and emergency service reliability would improve under any new ownership structure.