• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
Australia
Asia

Australia’s second-largest telco loses its CEO after a network outage that hit almost 40% of the country’s population

By
Lionel Lim
Lionel Lim
Asia Reporter
Down Arrow Button Icon
By
Lionel Lim
Lionel Lim
Asia Reporter
Down Arrow Button Icon
November 20, 2023, 2:33 AM ET
Illuminated signs displayed in the window of an outlet for the Australian communications company Optus.
Illuminated signs displayed in the window of an outlet for the Australian communications company Optus.David Gray—AFP via Getty Images

Millions of Australians woke up on the morning of Nov. 8 to find that their phones were completely useless. An unplanned outage from nationwide provider Optus hit customers in the middle of their morning commute and extended throughout the entire day, throwing several systems into chaos. Businesses couldn’t process electronic payments, hospitals couldn’t take phone calls, and public transport was delayed. The downtime affected some 10 million Australians, equal to about 40% of the country’s population.

Recommended Video

Now, the outage has claimed its first head, as Optus CEO Kelly Bayer Rosmarin resigned Monday following a critical report from the Australian Senate. Her resignation puts an end to an eventful tenure as the head of Australia’s second largest telecoms company, owned by Singapore Telecommunications, also known as Singtel.

Bayer Rosmarin said in a statement released by Singtel on Monday that she has had time for “personal reflection” and her resignation is in the “best interest of Optus moving forward”.

In that statement, Singtel said Bayer Rosmarin led Optus during a “challenging period,” and that Optus delivered improved financial performance and market share gains under her tenure.

Bayer Rosmarin was appointed CEO in April 2020 and the Nov. 8 outage was the second national scandal under her leadership. She had spent a year as deputy CEO and was previously at the Commonwealth Bank of Australia.

Last September, hackers breached Optus, exposing personal customer details in what some described as the worst data breach in the company’s history. The company admitted that addresses, drivers’ licenses, and passport numbers may have been revealed in the data breach. In April, 100,000 people joined a class-action lawsuit against Optus regarding the hack.

Then, on Nov. 8, an outage left millions of Optus mobile and internet customers without connection. The nationwide outage started at around 4:00am local time; connectivity to the majority of the network was only restored around 6:00pm late that day.

A Senate inquiry on Friday revealed that Optus had not planned for a network-wide outage and therefore had no backup in place. Bayer Rosmarin also said on Friday that Optus had received customer claims of about $282,000. The company believes a software upgrade at its corporate parent, Singtel, caused the outage.

Singtel said it understood the need for Optus “to regain customer trust and confidence,” Group CEO Yuen Kuan Moon said in a statement on Monday. “We view the events in recent weeks very seriously. We fully recognize the importance of Optus’ role in providing connectivity services to the community and the importance of network resiliency and security,” he continued.

Singtel is creating a new role of chief operating officer at Optus, which will be filled by the company’s former business managing director, Peter Kaliaropoulos.

Optus chief financial officer Michael Venter will take over at the Australian telco’s interim CEO while the company conducts a global search for a new head. Like his erstwhile boss, Venter is also from the Commonwealth Bank of Australia prior to joining Optus in March 2021.

Join us at the Fortune Workplace Innovation Summit May 19–20, 2026, in Atlanta. The next era of workplace innovation is here—and the old playbook is being rewritten. At this exclusive, high-energy event, the world’s most innovative leaders will convene to explore how AI, humanity, and strategy converge to redefine, again, the future of work. Register now.
About the Author
By Lionel LimAsia Reporter
LinkedIn icon

Lionel Lim is a Singapore-based reporter covering the Asia-Pacific region.

See full bioRight Arrow Button Icon

Latest in

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Leadership
  • Success
  • Tech
  • Asia
  • Europe
  • Environment
  • Fortune Crypto
  • Health
  • Retail
  • Lifestyle
  • Politics
  • Newsletters
  • Magazine
  • Features
  • Commentary
  • Mpw
  • CEO Initiative
  • Conferences
  • Personal Finance
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Most Popular

placeholder alt text
Economy
Elon Musk warns the U.S. is '1,000% going to go bankrupt' unless AI and robotics save the economy from crushing debt
By Jason MaFebruary 7, 2026
2 days ago
placeholder alt text
Economy
Russian officials are warning Putin that a financial crisis could arrive this summer, report says, while his war on Ukraine becomes too big to fail
By Jason MaFebruary 8, 2026
20 hours ago
placeholder alt text
Commentary
America marks its 250th birthday with a fading dream—the first time that younger generations will make less than their parents
By Mark Robert Rank and The ConversationFebruary 8, 2026
1 day ago
placeholder alt text
Commentary
We studied 70 countries' economic data for the last 60 years and something big about market crashes changed 25 years ago
By Josh Ederington, Jenny Minier and The ConversationFebruary 8, 2026
1 day ago
placeholder alt text
Success
Gen Z Patriots quarterback Drake Maye still drives a 2015 pickup truck even after it broke down on the highway—despite his $37 million contract
By Sasha RogelbergFebruary 7, 2026
2 days ago
placeholder alt text
Personal Finance
Tom Brady is making 15 times more as a commentator than he did playing in the big game thanks to $375 million contract 
By Eva RoytburgFebruary 8, 2026
1 day ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.


Latest in

Real EstateHousing
JPMorgan’s nationwide home price forecast hides a Sun Belt full of pain. Watch out, Florida and Texas
By Jason MaFebruary 9, 2026
9 minutes ago
David Risher, wearing a patterned shirt, speaks in front of a bright magenta background.
C-SuiteLyft
Lyft CEO David Risher is still a driver for the company: It made him realize being even one minute late could cost the customer their job
By Sasha RogelbergFebruary 9, 2026
28 minutes ago
Valentines Day balloons
Arts & EntertainmentCulture
Meet the women ditching their husbands for ‘Galentine’s Day,’ with no men allowed ‘unless the bartender happens to be male’
By Alicia Rancilio and The Associated PressFebruary 9, 2026
31 minutes ago
kiara
AIstart-ups
Exclusive: Peter Thiel-backed industrial AI startup emerges from stealth in a16z ‘American Dynamism’ push
By Nick LichtenbergFebruary 9, 2026
33 minutes ago
A man walks by the San Francisco Unified School District administrative building.
North AmericaSan Francisco
Classrooms close as San Francisco teachers launch first public school strike in nearly 50 years
By The Associated PressFebruary 9, 2026
33 minutes ago
Real EstateHousing
Which class of mortgage holder are you? Only 20% are in the elite pre-2022 camp
By Nick LichtenbergFebruary 9, 2026
37 minutes ago