Nano Nuclear CEO sells 25K shares at $17.44

Nano Nuclear Energy’s CEO sold 25,000 shares under a pre-arranged Rule 10b5-1 trading plan and reported retaining 660,000 shares.

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 1, 2026 in a sale characterized as an open-market or private transaction at a weighted-average price of $17.4426 per share. The transaction was effected pursuant to a Rule 10b5-1 trading plan adopted in September 2025, and after this sale he reported holding 660,000 shares of Nano Nuclear Energy common stock directly.

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 ($436K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	25,000	$17.4426	$436K

Holdings After Transaction: Common Stock — 660,000 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 $17.1100 to $17.6200. 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: $17.4426 per share Post-transaction holdings: 660,000 shares +2 more

5 metrics

Shares sold 25,000 shares Common stock sale on September 1, 2026 by CEO James John Walker

Weighted-average sale price $17.4426 per share Price for the 25,000-share common stock sale

Post-transaction holdings 660,000 shares Common stock directly owned by the CEO after the sale

Intraday sale price range $17.11–$17.62 per share Range of prices at which the multiple trades were executed on September 1, 2026

Rule 10b5-1 plan adoption date September 2025 Trading plan under which the September 1, 2026 sale was effected

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 adopted"

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

What insider transaction did NNE’s CEO report on this Form 4?

The CEO of Nano Nuclear Energy Inc. (NNE), James John Walker, reported a sale of 25,000 common shares on September 1, 2026 in an open-market or private transaction at a weighted-average price of $17.4426 per share.

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

After the reported sale, James John Walker reported direct ownership of 660,000 shares of Nano Nuclear Energy Inc. common stock. This figure reflects his holdings following the 25,000-share disposition on September 1, 2026.

Was the NNE CEO’s stock sale made under a Rule 10b5-1 trading plan?

Yes. The filing states the transaction was effected pursuant to a Rule 10b5-1 trading plan that James John Walker adopted in September 2025, indicating the trade was pre-arranged under that plan.

What price did the NNE CEO receive for the 25,000 shares sold?

The Form 4 reports a weighted-average price of $17.4426 per share. A footnote explains the shares were sold in multiple trades at prices ranging from $17.11 to $17.62, with the weighted-average price disclosed.

What type of transaction did the NNE Form 4 report for the CEO?

The transaction is reported as a sale of common stock in an open-market or private transaction, coded as a disposition. It involved 25,000 shares of Nano Nuclear Energy Inc. common stock on September 1, 2026.

Does the NNE Form 4 indicate any derivative securities for the CEO?

No. The Form 4’s derivative securities section is empty for this filing, and the reported activity covers only non-derivative common stock transactions for September 1, 2026.

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Available on EDGAR 09/03/2026 - 04:06 PM Accepted by SEC EDGAR 09/03/2026 - 04:05 PM 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)
09/01/2026

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	09/01/2026		S(1)		25,000	D	$17.4426(2)	660,000	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 $17.1100 to $17.6200. 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)