ioneer (NASDAQ: IONR) director discloses substantial initial holdings

Rhea-AI Filing Summary

ioneer Ltd director Margaret R. Walker has filed an initial ownership report showing a substantial personal stake in the company. She directly holds 990,343 ordinary shares, including 188,103 ordinary shares underlying time-based units that vest on November 2, 2026.

Walker also has exposure through American Depositary Shares. She holds American Depositary Shares representing 353,120 underlying ordinary shares, noted as 8,828 American Depositary Shares. Each American Depositary Share is convertible at any time into 40 ordinary shares and has no expiration date, giving her ongoing flexibility in how this position is held.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Walker Margaret R

(Last) (First) (Middle)

C/O IONEER LTD

9460 DOUBLE R. BLVD, SUITE 200

(Street)

RENO NEVADA 85921

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
ioneer Ltd [ IONR ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares	990,343(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
American Depositary Shares	(2)	(2)	Ordinary Shares	353,120(3)	(2)	D

Explanation of Responses:

1. Includes 188,103 Ordinary Shares underlying time-based units that vest on November 2, 2026.

2. Each American Depositary Share is convertible at any time, at the holder's election, into 40 ordinary shares of the issuer. The American Depositary Shares have no expiration date.

3. Represented by 8,828 American Depositary Shares.

	/s/ Margaret R Walker	03/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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* Form 3: SEC 1473 (03-26)

FAQ

What insider position did Margaret R. Walker report in ioneer (IONR)?

Margaret R. Walker reported direct ownership of 990,343 ordinary shares of ioneer Ltd. This total includes time-based units and reflects her initial disclosed equity stake as a director in the company.

How many ordinary shares of ioneer (IONR) does Margaret R. Walker hold directly?

She holds 990,343 ordinary shares directly in ioneer Ltd. This figure includes 188,103 ordinary shares underlying time-based units scheduled to vest on November 2, 2026, increasing the long-term component of her holdings.

What time-based units are included in Margaret R. Walker’s ioneer (IONR) holdings?

Her reported holdings include 188,103 ordinary shares underlying time-based units. These units are scheduled to vest on November 2, 2026, providing additional future ordinary shares as part of her compensation structure.

How many American Depositary Shares related to ioneer (IONR) does Margaret R. Walker hold?

Her position includes American Depositary Shares representing 353,120 underlying ordinary shares. A footnote clarifies this is represented by 8,828 American Depositary Shares, giving her indirect exposure to additional ordinary shares.

What is the conversion ratio for ioneer (IONR) American Depositary Shares reported by Margaret R. Walker?

Each American Depositary Share is convertible into 40 ordinary shares of ioneer Ltd. The ADSs are convertible at any time at the holder’s election and have no expiration date, offering ongoing flexibility in how the position is held.

Does Margaret R. Walker’s Form 3 for ioneer (IONR) show any recent insider trades?

The Form 3 describes holdings rather than transactions, listing her existing ordinary share and American Depositary Share positions. It does not show buy or sell activity, only her initial ownership levels as a company director.