IONEER LTD — Board/Management Information 2021

May 30, 2021

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Passing of Non-Executive Director, John Hofmeister

Monday, 31 May 2021 – ioneer Ltd (ioneer or ‘the Company’) (ASX: INR), is deeply saddened to advise that our much respected Non-Executive Director, Mr John Hofmeister, has passed away following a short illness.

John has served on the ioneer Board for the past four years, where he ably served as the chairman of the Nomination and Remuneration Committee and, even more importantly, as a very valuable contributor to the development of ioneer and our Rhyolite Ridge LithiumBoron project.

He will be deeply missed by the ioneer Board, management team and staff and the Company passes on its sincere condolences to John’s family.

ioneer Executive Chairman, James D. Calaway said:

“John brought energy, intellect, and deep experience to our Company. His years at GE, AlliedSignal and Royal Dutch Shell, where he ultimately served as President of Shell Oil USA, allowed him to have a profound impact on ioneer’s development and culture. Much of John’s professional expertise was gained through serving the organizations he worked for at the most senior human resources levels. John was an avid believer in the importance of diversity, and worked tirelessly for the National Urban League, where he served as Chairman and continued as a member of the Board until his death. He had an uncanny way of understanding leaders and people. His commitment to people and how to build organizations that honour them has had a profound impact on ioneer’s culture. This, among many other accomplishments, is his legacy.

John was also an exceptional and thought-provoking leader in the expansive arena of global energy policy. At a practical, industry level, John understood the challenges that must be addressed to make the necessary energy transformation we need for a sustainable future, and was a strong voice for energy industry change, which has helped guide our vision for Rhyolite Ridge. He served as a Chairman for US Department of Energy’s Hydrogen Fuel Cell Technical Advisory Committee, he was a key member of the United States Energy Security Council and founded the not-for-profit Citizens for Affordable Energy, as well as sharing his vast insights and knowledge as a Wrigley Scholar/Executive in Residence in the Global Institute of Sustainability at Arizona State University and a Lecturer at the University of Houston and at Kansas State University. John understood the critical and practical issues that need to be addressed as we transition from today’s fossil-based fuels energy industry to a low carbon emission environment.

We are forever grateful to this great man’s passion, energy and intelligence that he willingly shared with our Company. All the members of the board and executive team send their prayers to John’s loving family as they have assuredly lost the love of their lives.”

This ASX release has been authorised by ioneer Executive Chairman, James D. Calaway.

--ENDS--

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ioneer Ltd. (ASX: INR) Suite 5.03, 140 Arthur Street, North Sydney, NSW 2060 T: +61 2 9922 5800 W: ioneer.com ABN : 76 098 564 606

Contacts

Bernard Rowe Jane Munday Grace Altman ioneer Ltd FTI Consulting FTI Consulting Managing Director Investor & Media Relations Investor & Media Relations (USA) (Australia) T: +61 419 447 280 T: +61 488 400 248 T: +1 917 208 9352 E: browe@ioneer.com E: jane.munday@fticonsulting.com E: grace.altman@fticonsulting.com

About ioneer

ioneer Ltd is the 100% owner of the Rhyolite Ridge Lithium-Boron Project located in Nevada, USA, the only known lithium-boron deposit in North America and one of only two known such deposits in the world. The Definitive Feasibility Study (DFS)[1] completed in 2020 confirmed Rhyolite Ridge as a world-class lithium and boron project that is expected to become a globally significant, long-life, low-cost source of lithium and boron vital to a sustainable future.

1 Refer ASX release titled ‘ioneer Delivers Definitive Feasibility Study that Confirms Rhyolite Ridge as a World-Class Lithium and Boron Project’ announced 30 April 2020.

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