Nano Nuclear CEO sells 25K shares at $17.77

Rhea-AI Filing Summary

Nano Nuclear Energy Inc. (NNE) director and Chief Executive Officer James John Walker reported selling 25,000 shares of common stock on September 3, 2026 in an open-market or private transaction at a weighted-average price of $17.77 per share under a Rule 10b5-1 trading plan.

The filing states that, after this sale, Walker held 635,000 shares of Nano Nuclear Energy common stock directly. The transaction was executed in multiple trades at prices ranging from $17.59 to $18.20 per share.

Insider Trade Summary 10b5-1

Net Seller: 25,000 shares

Net Sell 1 txn

Insider Walker James John

Role Chief Executive Officer

Sold 25,000 shs ($444K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	25,000	$17.7667	$444K

Holdings After Transaction: Common Stock — 635,000 shares (Direct)

Footnotes (2)

1. F1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2025.
2. F2. This transaction was executed in multiple trades during the day at prices ranging from $17.5900 to $18.2000. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

Key Figures

Shares sold: 25,000 shares Weighted-average sale price: $17.77 per share Sale price range: $17.59–$18.20 per share +2 more

5 metrics

Shares sold 25,000 shares CEO James John Walker sale on September 3, 2026

Weighted-average sale price $17.77 per share Common stock sale on September 3, 2026

Sale price range $17.59–$18.20 per share Multiple trades during the September 3, 2026 transaction

Shares held after transaction 635,000 shares Direct holdings of CEO James John Walker following the sale

Net insider share change -25,000 shares Net effect of reported insider transactions in this Form 4

Key Terms

Rule 10b5-1 trading plan, weighted-average price, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"This transaction was effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted-average price financial

"The weighted-average price is reported above"

Weighted-average price is the average of multiple prices where each price is counted according to its size or importance—larger trades carry more weight than smaller ones, like averaging course grades by credit hours. It matters to investors because it gives a more realistic picture of the true price paid or received, helping assess trade execution, compare performance, calculate cost basis, and value positions more accurately than a simple average.

open market or private transaction market

"Sale in open market or private transaction"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Nano Nuclear Energy (NNE) disclose in this Form 4?

Nano Nuclear Energy disclosed that CEO and director James John Walker sold 25,000 shares of common stock on September 3, 2026 in an open-market or private transaction at a weighted-average price of $17.77 per share.

How many Nano Nuclear Energy (NNE) shares does the CEO hold after this transaction?

After the reported sale, CEO James John Walker directly holds 635,000 shares of Nano Nuclear Energy common stock, as stated in the Form 4 filing.

Was the Nano Nuclear Energy (NNE) CEO’s share sale made under a Rule 10b5-1 plan?

Yes. The Form 4 states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by CEO James John Walker in September 2025.

What price range did the Nano Nuclear Energy (NNE) CEO’s shares sell for?

The Form 4 notes the sale was executed in multiple trades at prices ranging from $17.59 to $18.20 per share, with a weighted-average price of $17.77 per share reported.

How many shares in total did insiders buy or sell in this Nano Nuclear Energy (NNE) Form 4?

The filing reports insider activity consisting of a net sale of 25,000 shares of Nano Nuclear Energy common stock, all from the CEO’s reported transaction.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/03/2026 - 05:52 PM EDT Accepted by SEC EDGAR 09/03/2026 - 05:49 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Walker James John

(Last) (First) (Middle)

10 TIMES SQUARE, 30TH FLOOR

(Street)

NEW YORK NEW YORK 10018

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Nano Nuclear Energy Inc. [ NNE ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/03/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/03/2026		S(1)		25,000	D	$17.7667(2)	635,000	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2025.

2. This transaction was executed in multiple trades during the day at prices ranging from $17.5900 to $18.2000. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

	/s/ James John Walker	09/03/2026
	** 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 4 (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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)