ioneer Ltd (IONR) sets up $300M shelf to fund Nevada lithium-boron project

Rhea-AI Filing Summary

ioneer Ltd has filed a shelf registration on Form F-3 to offer up to $300,000,000 of securities, including ordinary shares (which may be represented by ADSs), preference shares, warrants, subscription rights, debt securities and units, in one or more offerings from time to time after effectiveness.

The company’s primary business is developing the Rhyolite Ridge lithium-boron project in Nevada, in which it holds a 100% interest. As of December 31, 2025, it had invested US$209.0 million in the project and obtained a federal permit and Record of Decision from the U.S. Bureau of Land Management in 2024, completing the federal permitting process. On January 20, 2025, ioneer closed a US$996 million U.S. Department of Energy loan, including US$968 million in principal and US$28 million in capitalized interest with a 20-year term, to support an on-site processing facility, subject to conditions precedent. Net proceeds from any securities sales are expected to be used for general corporate purposes.

Filing Explained

The July 20 registration is still subject to completion, so no securities sale is disclosed; later ordinary-share issuance could reduce existing ownership percentages.

This F-3 is a shelf-registration statement, but it is marked subject to completion and says ioneer may not sell securities until the registration becomes effective.

It therefore creates future registered capacity rather than reporting a completed financing, issuance, or dilution event.

For any particular offering, the filing says the amount and price will be determined at that time, with an accompanying prospectus supplement describing the specific terms and net proceeds.

Each ADS represents 40 ordinary shares; if ioneer later issues additional ordinary shares, the total share count would increase and existing holders’ percentage ownership could decrease absent offsetting changes.

The next state change to monitor is an effective registration statement followed by a prospectus supplement for a specific offering; neither is disclosed here.

Key Figures

Shelf capacity: $300,000,000 Project investment to date: US$209.0 million DOE loan total: US$996 million +5 more

8 metrics

Shelf capacity $300,000,000 Maximum aggregate offering amount of securities registered on Form F-3

Project investment to date US$209.0 million Amount invested in the Rhyolite Ridge Project as of December 31, 2025

DOE loan total US$996 million Loan from U.S. Department of Energy Loan Programs Office to support on-site processing facility

DOE loan principal US$968 million Principal component of the US$996 million DOE loan

Capitalized interest US$28 million Capitalized interest included in the DOE loan amount

DOE loan term 20 years Stated term of the DOE loan for the Project

ADS ratio 40 ordinary shares per ADS Each ADS represents 40 ordinary shares listed on ASX

Loan principal increase US$268 million Increase in loan principal versus conditional commitment announced January 16, 2023

Key Terms

shelf registration process, American depositary shares, Rhyolite Ridge Project, Record of Decision, +2 more

6 terms

shelf registration process regulatory

"This prospectus is part of a registration statement on Form F-3 that we filed with the SEC using a shelf registration process."

American depositary shares financial

"Our ADSs, each representing 40 of our ordinary shares, are listed on the Nasdaq Capital Market."

American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

Rhyolite Ridge Project technical

"ioneer’s primary business is to develop a lithium-boron mine and processing facility, known as the Rhyolite Ridge Project."

Record of Decision regulatory

"The formal Record of Decision followed the issuance in September 2024 of the final Environmental Impact Statement."

A record of decision is an official written statement from a government regulator that explains and finalizes its approval or denial of a proposed project after reviewing environmental and legal factors. For investors, it matters because it removes a major regulatory uncertainty — like a referee’s final whistle — allowing a project to move forward, be funded, or be halted, which can change timelines, costs, and potential liabilities.

Advanced Technology Vehicles Manufacturing program regulatory

"loan from the U.S. Department of Energy Loan Programs Office under the Advanced Technology Vehicles Manufacturing program."

foreign private issuer regulatory

"a “foreign private issuer”, as defined in Rule 405 under the U.S. Securities Act of 1933."

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

Offering Details

shelf

Offering

Offering Type shelf

Use of Proceeds Net proceeds from the sale of securities are expected to be used for general corporate purposes, with any specific allocation described in the relevant prospectus supplement.

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Available on EDGAR 07/20/2026 - 06:00 PM Accepted by SEC EDGAR 07/20/2026 - 04:55 PM Learn about SEC filing dates

FAQ

What is ioneer Ltd (IONR) registering under its Form F-3 shelf?

ioneer Ltd is registering up to $300,000,000 of securities, including ordinary shares, preference shares, warrants, subscription rights, debt securities and units, to be offered in one or more future transactions.

How will ioneer Ltd (IONR) use proceeds from securities sold under this prospectus?

ioneer plans to use net proceeds from securities sales for general corporate purposes. A specific allocation, if any, will be described in the relevant prospectus supplement for each particular offering.

What key financing has ioneer Ltd (IONR) secured for the Rhyolite Ridge Project?

ioneer closed a US$996 million loan from the U.S. Department of Energy, including US$968 million principal and US$28 million capitalized interest, with a 20-year term, to support an on-site processing facility.

How much has ioneer Ltd (IONR) invested in the Rhyolite Ridge Project to date?

As of December 31, 2025, ioneer had invested US$209.0 million in the Rhyolite Ridge lithium-boron project in Nevada, reflecting cumulative development, technical studies and permitting expenditures.

What stock exchange listings do ioneer Ltd (IONR) securities have?

ioneer’s ADSs, each representing 40 ordinary shares, trade on the Nasdaq Capital Market under “IONR”. Its ordinary shares trade on the Australian Securities Exchange under the symbol “INR”.

What regulatory milestone has ioneer Ltd (IONR) achieved for Rhyolite Ridge?

The Rhyolite Ridge Project received its federal permit and Record of Decision from the U.S. Bureau of Land Management in 2024, concluding the federal permitting process that began in early 2020.

What is the status of ioneer Ltd (IONR) as a reporting company?

ioneer is an emerging growth company and a foreign private issuer, qualifying for reduced U.S. public company reporting requirements under the JOBS Act and SEC rules.

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As filed with the Securities and Exchange Commission on July 20, 2026

Registration No. 333-   

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM F-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

IONEER LTD

(Exact name of Registrant as specified in its charter)

N/A

(Translation of Registrant’s name into English)

Australia			Not Applicable
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification No.)

Suite 16.01, Level 16, 213 Miller Street

North Sydney, NSW 2060, Australia

(Address, including zip code, and telephone number, including area code, of Registrant’s principal executive offices)

Bernard Rowe

Managing Director and Chief Executive Officer

61 (2) 9922-5800 (telephone)

Suite 16.01, Level 16, 213 Miller Street

North Sydney, NSW 2060, Australia

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Eric Scarazzo

Gibson, Dunn & Crutcher LLP

200 Park Avenue

New York, New York 10166

Tel: (212) 351-4000

Fax: (212) 351-4035

Approximate date of commencement of proposed sale to the public: From time to time after the effectiveness of this registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.C. or a post-effective amendment thereon that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☐

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.C. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933.

Emerging growth company ☒

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the registration statement shall become effective on such date as the Commission acting pursuant to said Section 8(a), may determine.

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The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities, and it is not soliciting an offer to buy these securities, in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED JULY 20, 2026

PROSPECTUS

IONEER LTD

$300,000,000

Ordinary Shares

Preference Shares

Warrants

Subscription Rights

Debt Securities

Units

We may from time to time offer our ordinary shares, which may be represented by American depositary shares (“ADSs”), preference shares, warrants, subscription rights, debt securities and/or units, which we refer to collectively as the “securities.” This prospectus describes the general terms of these securities and the general manner in which we will offer these securities. We will provide the specific terms of the securities that may be offered, and the manner in which they are being offered, in one or more supplements to this prospectus. Any supplement may also add, update or change information contained in this prospectus. We will not use this prospectus to offer any securities unless it is attached to a prospectus supplement. You should read both this prospectus and any prospectus supplement, together with the additional information described under the heading “Where You Can Find More Information,” before investing in the securities. The amount and price of the securities will be determined at the time of any offering thereof.

Our ADSs, each representing 40 of our ordinary shares, are listed on the Nasdaq Capital Market under the symbol “IONR.” Our ordinary shares are listed on the Australian Securities Exchange under the symbol “INR.”

We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act, and a “foreign private issuer”, as defined in Rule 405 under the U.S. Securities Act of 1933, as amended, or the Securities Act, and are eligible for reduced public company reporting requirements.

Investing in the securities involves risks. See the section entitled “Risk Factors” in our most recent annual report on Form 20-F and transition report on Form 20-F, filed with the U.S. Securities and Exchange Commission (the “SEC” or the “Commission”) on October 22, 2025 (the “Annual Report”) and April 29, 2026 (the “Transition Report”), respectively, our other filings with the SEC and in any applicable prospectus supplement.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is July 20, 2026.

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			Page
ABOUT THIS PROSPECTUS			1
WHERE YOU CAN FIND MORE INFORMATION			2
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE			2
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS			3
ENFORCEABILITY OF CERTAIN CIVIL LIABILITIES			4
PROSPECTUS SUMMARY			5
USE OF PROCEEDS			6
PROSPECTUS SUPPLEMENT			6
DESCRIPTION OF AMERICAN DEPOSITARY SHARES AND ORDINARY SHARES			7
DESCRIPTION OF SUBSCRIPTION RIGHTS			7
DESCRIPTION OF OTHER SECURITIES			8
PLAN OF DISTRIBUTION			9
LEGAL MATTERS			11
EXPERTS			11

We are responsible for the information contained in this prospectus, any accompanying prospectus supplement and the documents incorporated by reference herein and therein. We have not authorized any person to give you any other information, and we take no responsibility for any other information that others may give you. This document may only be used where it is legal to sell the securities. You should not assume that the information contained in this prospectus, any accompanying prospectus supplement and the documents incorporated by reference is accurate as of any date other than their respective dates. Our business, financial condition, results of operations and prospects may have changed since those dates. We are not making an offer of the securities in any state where the offer is not permitted.

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ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement on Form F-3 that we filed with the SEC using a shelf registration process. Under this shelf registration process, we may offer and sell any combination of the securities described in this prospectus in one or more offerings. Each time we sell securities we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus.

Unless the context otherwise requires, in this prospectus the terms “we,” “us,” “our,” “ioneer,” “the Company” and “the registrant” refer to ioneer Ltd and its consolidated subsidiaries.

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WHERE YOU CAN FIND MORE INFORMATION

We file periodic reports and other information with the SEC. The SEC maintains a website (http://www.sec.gov) on which our annual and other reports are made available. In addition, the securities may specify that certain documents are available for inspection at the office of the ADS depositary. All Internet references in this prospectus are inactive textual references and we do not incorporate website contents into this prospectus.

Upon written or oral request, we will provide to any person, at no cost to such person, including any beneficial owner to whom a copy of this prospectus is delivered, a copy of any or all of the information that has been incorporated by reference in this prospectus but not delivered with this prospectus. You may make such a request by writing or telephoning us at the following address or telephone number:

ioneer Ltd

Suite 16.01, Level 16, 213 Miller Street

North Sydney, NSW 2060, Australia

Tel.: +61 (2) 9922-5800

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” the information we file with the SEC, which means that we can disclose important information to you by referring you to those documents, which are considered part of this prospectus. Information that we file with the SEC in the future and incorporate by reference will automatically update and supersede the previously filed information. We incorporate by reference the documents listed below:

• our annual report on Form 20-F for the year ended June 30, 2025 filed with the SEC on October 22, 2025;

• our transition report on Form 20-F for the six-month transition period ended December 31, 2025 filed with the SEC on April 29, 2026;

• our reports on Form 6-K furnished to the SEC on April 30, 2026 and May 21, 2026 (Exhibit 99.1 only); and

• the description of our ordinary shares contained in Item 10.A and Item 10.B of our registration statement on Form 20-F (File No. 001-41412), originally filed on June 3, 2022, and any amendment or report filed for the purpose of updating such description, including the description set forth in Exhibit 2.3 to our annual report on Form 20-F for the fiscal year ended June 30, 2022.

We also incorporate by reference in this prospectus all subsequent annual reports filed with the SEC on Form 20-F under the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”), and those of our reports on Form 6-K furnished to the SEC that we specifically identify as being incorporated by reference in this prospectus after the date hereof and prior to the completion of an offering of securities under this prospectus.

As you read the above documents, this prospectus and any prospectus supplement, you may find inconsistencies in information from one document to another. If you find inconsistencies you should rely on the statements made in the most recent document, including this prospectus and any prospectus supplement. All information appearing in this prospectus is qualified in its entirety by the information and financial statements, including the notes thereto, contained in the documents we have incorporated by reference.

When acquiring any securities discussed in this prospectus, you should rely only on the information contained or incorporated by reference in this prospectus, any prospectus supplement and any “free writing prospectus” that we authorize to be delivered to you. Neither we, nor any underwriters or agents, have authorized anyone to provide you with different information. We are not offering the securities in any jurisdiction in which an offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation.

You should not assume that the information in this prospectus, any prospectus supplement or any document incorporated by reference is accurate or complete at any date other than the date mentioned on the cover page of those documents.

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain information included or incorporated by reference in this prospectus may be deemed to be “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. Such forward-looking statements concern our anticipated results and progress of our operations in future periods, planned exploration and, if warranted, development of our properties, plans related to our business and other matters that may occur in the future. These statements relate to analyses and other information that are based on forecasts of future results, estimates of amounts not yet determinable and assumptions of management. All statements contained herein that are not clearly historical in nature are forward-looking, and the words “anticipate”, “believe”, “expect”, “estimate”, “may”, “will”, “could”, “leading”, “intend”, “contemplate”, “shall” and similar expressions are generally intended to identify forward-looking statements. Forward-looking statements are subject to a variety of known and unknown risks, uncertainties and other factors which could cause actual events or results to differ from those expressed or implied by the forward-looking statements. Forward-looking statements in this prospectus include, but are not limited to, statements with respect to: risks related to our limited operating history in the lithium and boron industry; risks related to our status as a development stage company; risks related to our ability to identify mineralization and achieve commercial mining at the Project (as defined herein); risks related to mining, exploration and mine construction, if warranted, on our properties; risks related to our ability to achieve and maintain profitability and to develop positive cash flow from our mining activities; risks related to investment risk and operational costs associated with our exploration activities; risks related to our ability to access capital and the financial markets; risks related to compliance with government regulations; risks related to our ability to acquire necessary mining licenses, permits or access rights; risks related to environmental liabilities and reclamation costs; risks related to volatility in lithium or boron prices or demand for lithium or boron; risks related to stock price and trading volume volatility; risks relating to the development of an active trading market for the ADSs; risks related to ADS holders not having certain shareholder rights; risks related to ADS holders not receiving certain distributions; risks related to our status as a foreign private issuer and emerging growth company; and risks related to the other matters described in the section titled “Risk Factors” in the Annual Report and the Transition Report, our other filings with the SEC and in any applicable prospectus supplement.

All forward-looking statements reflect our beliefs and assumptions based on information available at the time the assumption was made. These forward-looking statements are not based on historical facts but rather on management’s expectations regarding future activities, results of operations, performance, future capital and other expenditures (including the amount, nature and sources of funding thereof), competitive advantages, business prospects and opportunities. By its nature, forward-looking information involves numerous assumptions, inherent risks and uncertainties, both general and specific, known and unknown, that contribute to the possibility that the predictions, forecasts, projections or other forward-looking statements will not occur. Although we have attempted to identify important factors that could cause actual results to differ materially from those described in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those anticipated, believed, estimated or expected. We caution readers not to place undue reliance on any such forward-looking statements, which speak only as of the date made. Except as otherwise required by the securities laws of the United States and Australia, we disclaim any obligation to subsequently revise any forward-looking statements to reflect events or circumstances after the date of such statements or to reflect the occurrence of anticipated or unanticipated events. We qualify all the forward-looking statements contained in this prospectus by the foregoing cautionary statements.

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ENFORCEABILITY OF CERTAIN CIVIL LIABILITIES

We are a public company limited by shares incorporated under the laws of Australia. Certain of our directors and executive officers and certain other persons named in this prospectus are citizens and residents of countries other than the United States and all or a significant portion of the assets of such persons may be located outside the United States. As a result, it may not be possible for you to:

• effect service of process within the United States upon our non-U.S. resident directors, executive officers and other persons named in this prospectus or on us;

• enforce in U.S. courts judgments obtained against our non-U.S. resident directors, executive officers and other persons named in this prospectus or us in any action, including actions under the civil liability provisions of U.S. securities laws;

• enforce in U.S. courts judgments obtained against our non-U.S. resident directors, executive officers and other persons named in this prospectus or us in courts of jurisdictions outside the United States in any action, including actions under the civil liability provisions of U.S. securities laws; or

• bring an original action in an Australian court to enforce liabilities against our non-U.S. resident directors, executive officers and other persons named in this prospectus or us based solely upon U.S. securities laws.

You may also have difficulties enforcing in courts outside the United States judgments that are obtained in U.S. courts against any of our non-U.S. resident directors, executive officers and other persons named in this prospectus or us, including actions under the civil liability provisions of the U.S. securities laws.

With that noted, there are no treaties between Australia and the United States that would affect the recognition or enforcement of foreign judgments in Australia. We also note that investors may not be able to bring an original action in an Australian court against us to enforce liabilities based in part upon U.S. federal securities laws.

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PROSPECTUS SUMMARY

This summary description about us and our business highlights selected information contained elsewhere in this prospectus or incorporated by reference in this prospectus. This summary does not contain all of the information you should consider before buying our securities. You should carefully read this entire prospectus and any applicable prospectus supplement, including each of the documents incorporated by reference herein or therein, before making an investment decision.

Overview

ioneer’s primary business is to develop a lithium-boron mine and processing facility, known as the Rhyolite Ridge Project, in Esmeralda County, Nevada, United States (the “Project”). The Project is located on public land administered by the Bureau of Land Management (the “BLM”) of the U.S. Department of Interior. ioneer currently holds a 100% interest in the Project. On June 2, 2025, we released revised Project economics to the completed definitive feasibility study (the “DFS”) announced April 30, 2020, which was followed by a second announcement of further material improvement in Project economics released in September 2025. In October 2025, we announced an additional material improvement in Project economics, as described in the Rhyolite Ridge Lithium-Boron Project S-K 1300 Technical Report Summary dated as of April 25, 2026 and filed as Exhibit 15.11 to the Transition Report. The updated Project economics reaffirmed the Project can operate at scale, over a long life and with the potential to be a low-cost and globally significant producer of both lithium and boron. Following the completion of all technical studies and all necessary permitting activities, we may undertake mining and processing activities to become a U.S. source of lithium and boron.

As of December 31, 2025, we had invested US$ 209.0 million in the Project.

On October 25, 2024, the Project received its federal permit from the BLM. The formal Record of Decision followed the issuance in September 2024 of the final Environmental Impact Statement by the BLM. This concluded the federal permitting process, which began in early 2020.

On January 20, 2025, we announced the closing of a US$ 996 million loan from the U.S. Department of Energy Loan Programs Office under the Advanced Technology Vehicles Manufacturing program to support the development of an on-site processing facility at the Project. The total amount of the loan, US$ 996 million, includes US$ 968 million in principal and US$ 28 million in capitalized interest with a term of 20 years. The loan amount represents a US$ 268 million increase in loan principal from the conditional loan commitment announced January 16, 2023. The loan will be at an interest rate fixed from the date of each advance for the term of the loan at applicable U.S. Treasury rates. Conditions precedent to first loan funding include, among other requirements, closing a strategic partnering agreement for the equity component of the build cost, securing necessary additional required funding and a project finance model bring down. ioneer is currently running a strategic partnering process with the assistance of Goldman Sachs to secure additional funding requirements for the Project.

Our ordinary shares are publicly traded on the Australian Securities Exchange under the symbol “INR”. Our ADSs, each representing 40 of our ordinary shares, are publicly traded on the Nasdaq Capital Market under the symbol “IONR”. The Bank of New York Mellon, acting as depositary, registers and delivers the ADSs.

Corporate Information

Our head office is located at 16.01, Level 16, 213 Miller Street, North Sydney, NSW 2060 Australia. Our registered office is located at 16.01, Level 16, 213 Miller Street, North Sydney, NSW 2060 Australia. The telephone number of our registered office is +61 (2) 9922-5800.

We also maintain a website at www.ioneer.com. The information contained on our website or available through our website is not incorporated by reference into and should not be considered a part of this prospectus, and the reference to our website in this prospectus is an inactive textual reference only.

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USE OF PROCEEDS

Except as may be described otherwise in a prospectus supplement, we will use the net proceeds from our sale of the securities under this prospectus for general corporate purposes. We may designate a specific allocation of the net proceeds of an offering of securities by us to a specific purpose, if any, at the time of the offering and will describe any allocation in the related prospectus supplement.

PROSPECTUS SUPPLEMENT

This prospectus provides you with a general description of the securities that may be offered. With respect to a particular offering of the securities registered hereby, to the extent required, an accompanying prospectus supplement or, if appropriate, a post-effective amendment to the registration statement of which this prospectus is a part will be prepared. You should read both this prospectus and any prospectus supplement and the documents incorporated by reference in this prospectus and any prospectus supplement, together with additional information described under the heading “Where You Can Find More Information” carefully before investing in the securities. The prospectus supplement to be attached to the front of this prospectus will describe the terms of the offering, including the amount and more detailed items of the securities, the initial public offering price, the price paid for the securities, net proceeds, the expenses of the offering, the terms of offers and sales outside of the United States, if any, our capitalization, the nature of the plan of distribution, the terms of any rights offering, including the subscription price for ordinary shares, record date, ex-rights date and exercise period, the other specific terms related to the offering, and any U.S. federal income tax considerations and Australian tax considerations applicable to the securities. Any information in a prospectus supplement, if any, or information incorporated by reference after the date of this prospectus is considered part of this prospectus and may add, update or change information contained in this prospectus. Any information in such subsequent filings that is inconsistent with this prospectus will supersede the information in this prospectus.

We have not authorized anyone to provide any information other than that contained or incorporated by reference in this prospectus. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. We have not authorized any other person to provide you with different information. We are not making an offer to sell the securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus is accurate only as of the date on the front cover of this prospectus. Our business, financial condition, results of operations and prospects may have changed since that date.

ioneer Ltd is a public company limited by shares incorporated under the laws of Australia. We publish our financial statements in United States dollars.

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DESCRIPTION OF AMERICAN DEPOSITARY SHARES AND ORDINARY SHARES

For a description of our ordinary shares and the ADSs, including the rights and obligations attached thereto, please refer to Exhibit 2.3 to our Transition Report on Form 20-F for the six months ended December 31, 2025, which is incorporated by reference herein.

DESCRIPTION OF SUBSCRIPTION RIGHTS

We may issue subscription rights to purchase our ordinary shares, including ordinary shares represented by ADSs. We may issue these rights independently or together with any other offered security. The rights may or may not be transferable in the hands of their holders.

The applicable prospectus supplement will describe the specific terms of any subscription rights offering, including:

• the title of the subscription rights;

• the securities for which the subscription rights are exercisable;

• the number of subscription rights issued;

• the extent to which the subscription rights are transferable;

• if applicable, a discussion of the material U.S. federal or other income tax considerations applicable to the issuance or exercise of the subscription rights;

• any other terms of the subscription rights, including terms, procedures and limitations relating to the exchange and exercise of the subscription rights;

• if applicable, the record date to determine who is entitled to the subscription rights and the ex-rights date;

• the date on which the rights to exercise the subscription rights will commence, and the date on which the rights will expire;

• the extent to which the offering includes an over-subscription privilege with respect to unsubscribed securities; and

• if applicable, the material terms of any standby underwriting arrangement we enter into in connection with the offering.

Each subscription right will entitle its holder to purchase for cash a number of our ordinary shares, ADSs or any combination thereof at an exercise price described in the applicable prospectus supplement. Subscription rights may be exercised at any time up to the close of business on the expiration date set forth in the prospectus supplement. After the close of business on the expiration date, all unexercised subscription rights will become void.

Upon receipt of payment and the subscription form properly completed and executed at the subscription rights agent’s office or another office indicated in the applicable prospectus supplement, we will, as soon as practicable, forward our ordinary shares or the ADSs purchasable with this exercise. Rights to purchase our ordinary shares represented by ADSs will be evidenced by certificates issued upon receipt by the ADS depositary of the rights to purchase ordinary shares registered hereby. The applicable prospectus supplement may offer more details on how to exercise the subscription rights.

We may determine to offer subscription rights to our shareholders only or additionally to persons other than shareholders as described in the applicable prospectus supplement. In the event subscription rights are offered to our shareholders only and their rights remain unexercised, we may determine to offer the unsubscribed securities to persons other than shareholders. In addition, we may enter into a standby underwriting arrangement with one or more underwriters under which the underwriter(s) will purchase any securities remaining unsubscribed for after the offering, as described in the applicable prospectus supplement.

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DESCRIPTION OF OTHER SECURITIES

We will set forth in the applicable prospectus supplement a description of any preference shares, warrants, debt securities or units that may be offered pursuant to this prospectus.

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PLAN OF DISTRIBUTION

The securities may be sold, and the underwriters may resell the securities, directly or through agents in one or more transactions, including negotiated transactions, at a fixed public offering price or prices, which may be changed, or at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices. The securities may be sold in portions outside the United States at an offering price and on terms specified in the applicable prospectus supplement relating to a particular issue of the securities. Without limiting the generality of the foregoing, any one or more of the following methods may be used when selling the securities:

• ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers;

• block trades in which the broker-dealer will attempt to sell the securities as agent but may position and resell a portion of the block as principal to facilitate the transaction;

• purchases by a broker-dealer as principal and resale by the broker-dealer for its account;

• an exchange distribution in accordance with the rules of the applicable exchange;

• privately negotiated transactions;

• settlement of short sales entered into after the date of this prospectus;

• sales in which broker-dealers agree with us or a selling securityholder to sell a specified number of securities at a stipulated price per security;

• through the writing or settlement of options or other hedging transactions, whether through an options exchange or otherwise;

• by pledge to secure debts or other obligations;

• by an underwritten public offering;

• in a combination of any of the above; or

• any other method permitted pursuant to applicable law.

In addition, the securities may be sold by way of exercise of rights granted pro rata to our existing shareholders.

The securities may also be sold short and securities covered by this prospectus may be delivered to close out such short positions, or the securities may be loaned or pledged to broker-dealers that in turn may sell them. Options, swaps, derivatives or other transactions may be entered into with broker-dealers or other financial institutions which require the delivery to such broker-dealer or other financial institution of the securities and ordinary shares, respectively, which securities such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction).

Any underwriters or agents will be identified and their compensation described in the applicable prospectus supplement.

In connection with the sale of securities, the underwriters or agents may receive compensation from us, a selling securityholder or from purchasers of the securities for whom they may act as agents. The underwriters may sell securities to or through dealers, who may also receive compensation from the underwriters or from purchasers of the securities for whom they may act as agents. Compensation may be in the form of discounts, concessions or commissions. Underwriters, dealers and agents that participate in the distribution of the securities may be deemed to be underwriters as defined in the Securities Act, and any discounts or commissions received by them from us or a selling securityholder and any profit on the resale of the securities by them may be treated as underwriting discounts and commissions under the Securities Act.

We or a selling securityholder may enter into agreements that will entitle the underwriters, dealers and agents to indemnification by us or a selling securityholder against and contribution toward certain liabilities, including liabilities under the Securities Act.

Certain underwriters, dealers and agents and their associates may be customers of, engage in transactions with or perform commercial banking, investment banking, advisory or other services for a selling securityholder or us, including our subsidiaries, in the ordinary course of their business.

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If so indicated in the applicable prospectus supplement relating to a particular issue of securities, the underwriters, dealers or agents will be authorized to solicit offers by certain institutions to purchase the securities under delayed delivery contracts providing for payment and delivery at a future date. These contracts will be subject only to those conditions set forth in the applicable prospectus supplement, and the prospectus supplement will set forth the commission payable for solicitation of these contracts.

We will advise any selling securityholder that while it is engaged in a distribution of the securities, it is required to comply with Regulation M promulgated under the Exchange Act (“Regulation M”). With limited exceptions, Regulation M precludes a selling securityholder, any affiliated purchasers and any broker-dealer or other person who participates in the distribution from bidding for or purchasing, or attempting to induce any person to bid for or purchase, any security which is the subject of the distribution until the entire distribution is complete. All of the foregoing might affect the marketability of the securities.

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LEGAL MATTERS

Certain legal matters with respect to Australian law will be passed upon for us by our Australian counsel, Ashurst Perkins Coie Australia. Certain legal matters with respect to United States and New York law will be passed upon for us by Gibson, Dunn & Crutcher LLP.

EXPERTS

The consolidated financial statements of ioneer Ltd appearing in ioneer Ltd’s Annual Report (Form 20-F) for the year ended June 30, 2025 and Transition Report (Form 20-F) for the six-month period ended December 31, 2025 have been audited by Ernst & Young, independent registered public accounting firm, as set forth in their reports thereon included therein, and incorporated herein by reference. Such financial statements are, and audited financial statements to be included in subsequently filed documents will be, incorporated herein in reliance upon the reports of Ernst & Young pertaining to such financial statements (to the extent covered by consents filed with the Securities and Exchange Commission) given on the authority of such firm as experts in auditing and accounting.

The estimates of mineral resources and related information incorporated by reference herein are based upon analyses contained in the Technical Report Summary, dated April 25, 2026 and amended and supplemented from time to time, and performed by AtkinsRéalis Canada Inc., Independent Mining Consultants, Inc., Westland Engineering & Environmental Services, Mr. Yoshio Nagai, Mr. Brent Johnson, NewFields Mining Design & Technical Services, LLC, Geo-Logic Associates, Inc., Mr. Chad Yeftich and Piteau Associates. Such estimates and related information have been so incorporated in reliance upon the authority of such persons as experts in such matters.

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PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

Item 8.
Indemnification of Directors and Officers

Australian law. Australian law provides that a company or a related body corporate of the company may provide for indemnification of officers and directors, except to the extent of any of the following liabilities incurred as an officer or director of the company:

• a liability owed to the company or a related body corporate of the company;

• a liability for a pecuniary penalty order made under section 1317G or a compensation order under section 1317H, 1317HA or 1317HB of the Australian Corporations Act 2001 (Cth) (Corporations Act);

• a liability that is owed to someone other than the company or a related body corporate of the company and did not arise out of conduct in good faith; or

• legal costs incurred in defending an action for a liability incurred as an officer or director of the company if the costs are incurred:

○ in defending or resisting proceedings in which the officer or director is found to have a liability for which they cannot be indemnified as set out above;

○ in defending or resisting criminal proceedings in which the officer or director is found guilty;

○ in defending or resisting proceedings brought by the Australian Securities & Investments Commission or a liquidator for a court order if the grounds for making the order are found by the court to have been established (except costs incurred in responding to actions taken by the Australian Securities & Investments Commission or a liquidator as part of an investigation before commencing proceedings for a court order); or

○ in connection with proceedings for relief to the officer or a director under the Corporations Act, in which the court denies the relief.

Constitution. Our Constitution provides that, to the maximum extent permitted by law and subject to certain exceptions, the Company indemnifies each person who is or has been a director or other officer of the Company against liabilities incurred by that person as an officer or director of the Company.

Indemnification Agreements. We have entered into indemnity deeds to indemnify our executives and directors against certain liabilities incurred in the course of performing their duties, including indemnifying for any legal expenses incurred in defending proceedings relating to their position with ioneer. Any indemnified amounts must be repaid to ioneer to the extent that a director is reimbursed from an insurance policy maintained by ioneer for the directors. ioneer has also agreed, to the extent permitted by law, to obtain and pay the premiums for insurance policies for each of its directors and executive officers.

SEC Position. Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers or persons controlling us pursuant to the foregoing provisions, we have been informed that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

Pursuant to the underwriting agreement for this offering, the form of which is filed as Exhibit 1.1 to this registration statement, the underwriters will agree to indemnify our directors and officers and persons controlling us, within the meaning of the Securities Act, against certain liabilities that might arise out of or are based upon certain information furnished to us by any such underwriter.

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Item 9.
Exhibits

Exhibits			Description
1.1*			Form of underwriting agreement for equity securities of the Company
1.2*			Form of underwriting agreement for debt securities of the Company
4.1			Deposit Agreement between ioneer Ltd and The Bank of New York Mellon, as depositary, and Owners and Holders of the American Depositary Shares (incorporated by reference to Exhibit 2.1 to the Company’s Registration Statement on Form 20-F, filed on June 3, 2022)
4.2			Form of American Depositary Receipt evidencing American Depositary Shares (included in Exhibit 4.1)
4.3*			Form of certificate for preference shares
4.4*			Specimen warrant certificate
4.5*			Form of warrant agreement
4.6*			Form of subscription agreement to exercise rights to purchase ordinary shares
4.7*			Form of rights certificate to purchase ordinary shares
4.8			Form of debt securities indenture
4.9*			Form of unit certificate
5.1			Opinion of Ashurst Perkins Coie Australia, Australian counsel
5.2			Opinion of Gibson, Dunn & Crutcher LLP, U.S. counsel
23.1			Consent of Ashurst Perkins Coie Australia (included in Exhibit 5.1)
23.2			Consent of Gibson, Dunn & Crutcher LLP (included in Exhibit 5.2)
23.3			Consent of Ernst & Young
23.4			Consent of AtkinsRéalis Canada Inc.
23.5			Consent of Independent Mining Consultants, Inc.
23.6			Consent of Westland Engineering & Environmental Services
23.7			Consent of Mr. Yoshio Nagai
23.8			Consent of Mr. Brent Johnson
23.9			Consent of NewFields Mining Design & Technical Services, LLC
23.10			Consent of Geo-Logic Associates, Inc.
23.11			Consent of Mr. Chad Yeftich
23.12			Consent of Piteau Associates
24.1			Power of Attorney (contained on the signature page to this registration statement)
25.1**			Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 of the Trustee under the debt securities indenture
96.1			S-K 1300 Technical Report Summary dated April 25, 2026 (incorporated by reference to Exhibit 15.11 to the Company’s Transition Report on Form 20-F, filed on April 29, 2026)
107			Filing Fee Table

*
To be filed by amendment or incorporated by reference to a subsequently furnished Report on Form 6-K.

**
To be filed in accordance with Section 305(b)(2) of the Trust Indenture Act of 1939, as amended.

Item 10.
Undertakings

(a)
The undersigned registrant hereby undertakes:

(1)
To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

(i)
To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;

(ii)
To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in

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volume and price represent no more than 20% change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement;

(iii)
To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;

provided, however, that paragraphs (a)(1)(i), (ii) and (iii) of this section do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

(2)
That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3)
To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(4)
To file a post-effective amendment to the registration statement to include any financial statements required by Item 8.A. of Form 20-F at the start of any delayed offering or throughout a continuous offering. Financial statements and information otherwise required by Section 10(a)(3) of the Securities Act need not be furnished, provided, that the registrant includes in the prospectus, by means of a post-effective amendment, financial statements required pursuant to this paragraph (a)(4) and other information necessary to ensure that all other information in the prospectus is at least as current as the date of those financial statements. Notwithstanding the foregoing, with respect to registration statements on Form F-3, a post-effective amendment need not be filed to include financial statements and information required by Section 10(a)(3) of the Securities Act or Item 8.A. of Form 20-F if such financial statements and information are contained in periodic reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the Form F-3.

(5)
That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:

(A)
Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and

(B)
Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

(6)
That, for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the

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underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(A)
Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

(B)
Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;

(C)
The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

(D)
Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

(b)
The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(c)
Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act, and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

(d)
The undersigned registrant hereby undertakes that:

(1)
For purposes of determining any liability under the Securities Act of 1933, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective.

(2)
For the purpose of determining any liability under the Securities Act of 1933, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(e)
The undersigned registrant hereby undertakes to file an application for the purpose of determining the eligibility of the trustee to act under subsection (a) of Section 310 of the Trust Indenture Act (“Act”) in accordance with the rules and regulations prescribed by the Commission under Section 305(b)(2) of the Act.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form F-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Sydney, Australia on July 20, 2026.

			IONEER LTD
			By:			/s/ Bernard Rowe
						Name:			Bernard Rowe
						Title:			Managing Director and Chief Executive Officer (principal executive officer)

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Bernard Rowe and Chad Yeftich, as his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead in any and all capacities, in connection with this registration statement, including to sign in the name and on behalf of the undersigned, this registration statement and any and all amendments thereto, including post-effective amendments and registrations filed pursuant to Rule 462 under the U.S. Securities Act of 1933, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the U.S. Securities and Exchange Commission, granting unto such attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or his or her substitute, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

Signature			Title			Date
/s/ James D. Calaway			Executive Chairman (principal executive officer)			July 20, 2026
Name: James D. Calaway
/s/ Bernard Rowe			Managing Director & Chief Executive Officer (principal executive officer)			July 20, 2026
Name: Bernard Rowe
/s/ April Hashimoto			Interim Chief Financial Officer (principal financial and accounting officer)			July 20, 2026
Name: April Hashimoto
/s/ Alan Davies			Director			July 20, 2026
Name: Alan Davies
/s/ Rose McKinney-James			Director			July 20, 2026
Name: Rose McKinney-James
/s/ Margaret Walker			Director			July 20, 2026
Name: Margaret Walker
/s/ Timothy Woodall			Director			July 20, 2026
Name: Timothy Woodall

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AUTHORIZED REPRESENTATIVE

Pursuant to the Securities Act of 1933, as amended, the undersigned, the duly authorized representative in the United States of ioneer Ltd, has signed this registration statement or amendment thereto on July 20, 2026.

			Authorized U.S. Representative
			By:			/s/ April Hashimoto
						Name:			April Hashimoto
						Title:			Interim Chief Financial Officer

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