James John Walker - 03 Jun 2026 Form 4 Insider Report for Nano Nuclear Energy Inc. (NNE)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: NNE
Reported as of: 03 Jun 2026
Net transaction value: -$3,276,423
SEC form: 4
Accepted by SEC: 05 Jun 2026, 17:52:00 UTC
Prior SEC filing: 04 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ James John Walker

Key filing fact

James John Walker filed Form 4 for Nano Nuclear Energy Inc. (NNE) on 05 Jun 2026.

Key facts

This page summarizes James John Walker's Form 4 filing for Nano Nuclear Energy Inc. (NNE).
12 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 05 Jun 2026, 17:52.

Change

Previous filing in this sequence was filed on 04 Feb 2026.
Current net transaction value: -$3,276,423.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002021757 Primary reporting owner

Walker James John

Relationship: Chief Executive Officer, Director
Address: 10 TIMES SQUARE, 30TH FLOOR, NEW YORK
Signature: /s/ James John Walker
Signature date: 05 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

NNE transaction

Common Stock

Options Exercise

Transaction value
Shares: +70,000
Change %: +12%
Price: $3.00^*
Shares after: 650,000
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F1

NNE transaction

Common Stock

Sale

Transaction value: $1,208,030
Shares: -46,145
Change %: -7.1%
Price: $26.18
Shares after: 603,855
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F4

NNE transaction

Common Stock

Sale

Transaction value: $605,670
Shares: -22,380
Change %: -3.7%
Price: $27.06
Shares after: 581,475
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F5

NNE transaction

Common Stock

Sale

Transaction value: $41,152
Shares: -1,475
Change %: -0.25%
Price: $27.90
Shares after: 580,000
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F6

NNE transaction

Common Stock

Options Exercise

Transaction value
Shares: +28,688
Change %: +4.9%
Price: $0.000000^*
Shares after: 608,688
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F2

NNE transaction

Common Stock

Sale

Transaction value: $690,426
Shares: -25,792
Change %: -4.2%
Price: $26.77
Shares after: 582,896
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F7

NNE transaction

Common Stock

Sale

Transaction value: $72,304
Shares: -2,624
Change %: -0.45%
Price: $27.56
Shares after: 580,272
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F8

NNE transaction

Common Stock

Sale

Transaction value: $5,766
Shares: -201
Change %: -0.03%
Price: $28.69
Shares after: 580,071
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F9

NNE transaction

Common Stock

Sale

Transaction value: $2,124
Shares: -71
Change %: -0.01%
Price: $29.91
Shares after: 580,000
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F10

NNE transaction

Common Stock

Sale

Transaction value: $650,950
Shares: -25,000
Change %: -4.3%
Price: $26.04
Shares after: 555,000
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F3, F11

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

NNE transaction Derivative

Stock Options

Options Exercise

Transaction value
Shares: -70,000
Change %: -14%
Price: $0.000000^*
Shares after: 430,000
Date: 03 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 70,000
Exercise price: $3.00
Footnotes: F1

NNE transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -28,688
Change %: -16%
Price: $0.000000^*
Shares after: 146,398
Date: 03 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 28,688
Exercise price: $0.000000
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 11 footnotes

Footnote F1

Represents shares of common stock issued upon exercise of certain options originally granted to the reporting person at the exercise price of $3.00 per share, which were fully vested and exercisable on June 7, 2023, with expiry on June 7, 2026. On June 3, 2026, such options were exercised.

Footnote F2

Represents shares of common stock issued upon the settlement of certain Restricted Stock Units ("RSUs") granted on June 3, 2025 under the Issuer's 2025 Equity Incentive Plan based on a value per share of $29.18, the closing price of the Issuer's common stock as reported on The Nasdaq Capital Market on June 3, 2025. On June 3, 2026, one third (1/3) of such RSUs were vested and settled.

Footnote F3

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

Footnote F4

This transaction was executed in multiple trades during the day at prices ranging from $25.7100 to $26.7000. 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.

Footnote F5

This transaction was executed in multiple trades during the day at prices ranging from $26.7050 to $27.6800. 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.

Footnote F6

This transaction was executed in multiple trades during the day at prices ranging from $27.7200 to $28.3750. 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.

Footnote F7

This transaction was executed in multiple trades during the day at prices ranging from $26.3700 to $27.3400. 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.

Footnote F8

This transaction was executed in multiple trades during the day at prices ranging from $27.3700 to $27.9400. 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.

Footnote F9

This transaction was executed in multiple trades during the day at prices ranging from $28.6600 to $28.9000. 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.

Footnote F10

This transaction was executed at a price of $29.9100. 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.

Footnote F11

This transaction was executed in multiple trades during the day at prices ranging from $25.7100 to $26.3700. 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.