WALKER JAMES JOHN (Chief Executive Officer) sold 18.2% of their position (123.69K shares) of NANO NUCLEAR ENERGY INC. on the open market

Open‑market sale worth $3.28M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 8 sales

WALKER JAMES JOHN

Filed: 6/5/2026ACC: 0001493152-26-027559

InsiderWALKER JAMES JOHNCIK 2021757

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IssuerNANO NUCLEAR ENERGY INC.CIK 1923891

DirectorOfficer· Chief Executive Officer

Since Feb 2026

-123.69K

Net shares

Net seller

$3.28M

Total sold

Open market trades

0B · 8S

Total transactions

98.69K acquired · 222.38K disposed

Non-Derivative Transactions10

Common Stock

Direct

M · Option Exercise

+70K

Price / share

$3.00

Trade value

$210K

% of position

12.1%

6/3/2026

580K→650K

Common Stock

Direct

S · Sale

−46.15K

Price / share

$26.18

Trade value

$1.21M

% of position

7.1%

6/3/2026

650K→603.86K

Common Stock

Direct

S · Sale

−22.38K

Price / share

$27.06

Trade value

$605.67K

% of position

3.7%

6/3/2026

603.86K→581.48K

Common Stock

Direct

S · Sale

−1.48K

Price / share

$27.90

Trade value

$41.15K

% of position

0.3%

6/3/2026

581.48K→580K

Common Stock

Direct

M · Option Exercise

+28.69K

Price / share

—

Trade value

—

% of position

4.9%

6/3/2026

580K→608.69K

Common Stock

Direct

S · Sale

−25.79K

Price / share

$26.77

Trade value

$690.43K

% of position

4.2%

6/3/2026

608.69K→582.90K

Common Stock

Direct

S · Sale

−2.62K

Price / share

$27.55

Trade value

$72.30K

% of position

0.5%

6/3/2026

582.90K→580.27K

Common Stock

Direct

S · Sale

−201.00

Price / share

$28.69

Trade value

$5.77K

% of position

0.0%

6/3/2026

580.27K→580.07K

Common Stock

Direct

S · Sale

−71.00

Price / share

$29.91

Trade value

$2.12K

% of position

0.0%

6/3/2026

580.07K→580K

Common Stock

Direct

S · Sale

−25K

Price / share

$26.04

Trade value

$650.95K

% of position

4.3%

6/3/2026

580K→555K

Total

Net shares

−25K

Net value

-$3.07M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	6/3/2026	M · Option Exercise	+70K	$3.00	$210K	12.1%	580K	650K
Common Stock Direct	6/3/2026	S · Sale	−46.15K	$26.18	$1.21M	7.1%	650K	603.86K
Common Stock Direct	6/3/2026	S · Sale	−22.38K	$27.06	$605.67K	3.7%	603.86K	581.48K
Common Stock Direct	6/3/2026	S · Sale	−1.48K	$27.90	$41.15K	0.3%	581.48K	580K
Common Stock Direct	6/3/2026	M · Option Exercise	+28.69K	—	—	4.9%	580K	608.69K
Common Stock Direct	6/3/2026	S · Sale	−25.79K	$26.77	$690.43K	4.2%	608.69K	582.90K
Common Stock Direct	6/3/2026	S · Sale	−2.62K	$27.55	$72.30K	0.5%	582.90K	580.27K
Common Stock Direct	6/3/2026	S · Sale	−201.00	$28.69	$5.77K	0.0%	580.27K	580.07K
Common Stock Direct	6/3/2026	S · Sale	−71.00	$29.91	$2.12K	0.0%	580.07K	580K
Common Stock Direct	6/3/2026	S · Sale	−25K	$26.04	$650.95K	4.3%	580K	555K
Total			−25K		-$3.07M

Derivative Transactions2

Stock Options

Direct

M · Option Exercise

Converts to

Common Stock

70K shares

−70K

Strike price

3.0

Held after

430K

Exercisable

—

6/3/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

28.69K shares

−28.69K

Strike price

Held after

146.40K

Exercisable

—

6/3/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Options Direct	Common Stock70K shares	6/3/2026	M · Option Exercise	−70K	3.0	—	430K
Restricted Stock Units Direct	Common Stock28.69K shares	6/3/2026	M · Option Exercise	−28.69K	0	—	146.40K