NNE insider ownership: who sold, why, and what they still hold

What stands out

Routine activity: 99.8% of sales were under disclosed plans, and no insider sold more than 1% of vested holdings.

A share of stake is shown for 0 of the 8 officers and directors who sold. 9 are left out

Left out: Jiang Yu, James Walker, Jaisun Garcha, Tsun Law, Roy Boyd II, Kenny Yu, Diane Hare, Florent Heidet and Seth Berl (share of stake is being verified).

Disclosed company stock is not an insider's whole wealth.

Who sold, and how much of their stake

Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.

Jiang Yu

President and Chairman, Director

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$158MDisclosed plan

James Walker

Chief Executive Officer, Director

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$11.5MDisclosed plan

Jaisun Garcha

Chief Financial Officer

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$3.5MDisclosed plan

Tsun Law

Director

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$1.8MDisclosed plan

Diane Hare

Director

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$1.3MDisclosed plan

All 8 sellers

Selling by month

Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.

Disclosed planTo cover taxesNo plan disclosedOne dollar scale for every month; the tallest bar is labeled

Recent activity

Past 30 days, Sep 14, 2026 to Oct 13, 2026

No officer or director trades were reported for the past 30 days. The most recent before that:

Sep 3, 2026James Walker sold 25K shares ($444K) under a disclosed trading plan.

Who	Shares	Price	% of total stake	Total stake after	Trade date	Filed
James Walker Chief Executive Officer, Director	25,000	$17.77	n/a	n/a	Sep 3, 2026	Sep 3, 2026

Common questions

Is the Nano Nuclear Energy Inc. CEO selling stock?

Yes. James Walker sold 394K shares ($11.5M) in the past 12 months, all of it under a trading plan disclosed in the filings.

Why are Nano Nuclear Energy Inc. insiders selling?

Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 99.8% of sales by value ran under 10b5-1 trading plans disclosed in the filings, 0.1% were to cover taxes and 0.1% had no disclosed plan. A trading plan schedules sales in advance.

Are any Nano Nuclear Energy Inc. insiders buying?

No. Officers and directors reported no purchases in the past 12 months.

The evidence

Who sold8 officers and directors: amount, % of holdings, trading plan

Who sold	Amount	% of holdings	Trading plan
Jiang Yu President and Chairman, Director	$158M 5.47M shares	Not confirmed share of stake is being verified. Why	Disclosed plan
James Walker Chief Executive Officer, Director	$11.5M 394K shares	Not confirmed share of stake is being verified. Why	Disclosed plan
Jaisun Garcha Chief Financial Officer	$3.5M 112K shares	Not confirmed share of stake is being verified. Why	Disclosed plan
Tsun Law Director	$1.8M 55K shares	Not confirmed share of stake is being verified. Why	Disclosed plan
Diane Hare Director	$1.3M 43K shares	Not confirmed share of stake is being verified. Why	Disclosed plan
Kenny Yu Director	$1.3M 40K shares	Not confirmed share of stake is being verified. Why	Disclosed plan
Seth Berl Director	$195K 7.4K shares	Not confirmed share of stake is being verified. Why	52% to cover taxes 48% no plan disclosed
Florent Heidet Chief Technology Officer	$75K 3K shares	Not confirmed share of stake is being verified. Why	No plan disclosed

The full ownership picture0 of 9 officers and directors confirmed

Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.

Insider

Held Oct 13, 2025

Sold

Held Oct 13, 2026

Still held

Jiang Yu

Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. See the filing Sales and other transactions for Jiang Yu are complete.

President and Chairman, Director

n/a

−5.47M

n/a

Vesting, gifts, unvested awards and holding lines for Jiang Yu

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jiang Yu are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
300,000	$28.32	n/a	$0
200,000	$1.50	n/a	$3.3M
500,000	$1.50	n/a	$8.1M
300,000	$3.00	n/a	$4.4M

Estimate: options held × ($17.77 − strike price), using the most recent insider trade price on Form 4 (Sep 3, 2026), not a market close.

James Walker

Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for James Walker are complete.

Chief Executive Officer, Director

n/a

−394K

n/a

Vesting, gifts, unvested awards and holding lines for James Walker

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for James Walker are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
300,000	$28.32	n/a	$0
500,000	$1.50	n/a	$8.1M
300,000	$3.00	n/a	$4.4M

Estimate: options held × ($17.77 − strike price), using the most recent insider trade price on Form 4 (Sep 3, 2026), not a market close.

Jaisun Garcha

Chief Financial Officer

n/a

−112K

n/a

Vesting, gifts, unvested awards and holding lines for Jaisun Garcha

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jaisun Garcha are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
150,000	$28.32	n/a	$0
190,000	$1.50	n/a	$3.1M
150,000	$3.00	n/a	$2.2M

Estimate: options held × ($17.77 − strike price), using the most recent insider trade price on Form 4 (Sep 3, 2026), not a market close.

Tsun Law

Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Tsun Law are complete.

Director

n/a

−55K

n/a

Vesting, gifts, unvested awards and holding lines for Tsun Law

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Tsun Law are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
5,000	$28.32	n/a	$0
5,000	$1.50	n/a	$81K

Estimate: options held × ($17.77 − strike price), using the most recent insider trade price on Form 4 (Sep 3, 2026), not a market close.

Roy Boyd II

President of Issuer Subsidiary

n/a

Vesting, gifts, unvested awards and holding lines for Roy Boyd II

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Roy Boyd II are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Kenny Yu

Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Kenny Yu are complete.

Director

n/a

−40K

n/a

Vesting, gifts, unvested awards and holding lines for Kenny Yu

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kenny Yu are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
5,000	$28.32	n/a	$0
5,000	$3.00	n/a	$74K

Estimate: options held × ($17.77 − strike price), using the most recent insider trade price on Form 4 (Sep 3, 2026), not a market close.

Diane Hare

Director

n/a

−43K

n/a

Vesting, gifts, unvested awards and holding lines for Diane Hare

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Diane Hare are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
5,000	$28.32	n/a	$0
5,000	$3.00	n/a	$74K

Estimate: options held × ($17.77 − strike price), using the most recent insider trade price on Form 4 (Sep 3, 2026), not a market close.

Florent Heidet

Chief Technology Officer

n/a

−3K

n/a

Vesting, gifts, unvested awards and holding lines for Florent Heidet

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Florent Heidet are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Seth Berl

Director

n/a

−7.4K

n/a

Vesting, gifts, unvested awards and holding lines for Seth Berl

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Seth Berl are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Holdings and share of stake for Nano Nuclear Energy Inc. are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.

What explains the selling$178M of sales by plan status, purpose, seller and month

Officer and director open-market sales: $178M across 6,127,145 shares. Plan status and stated purpose are separate questions, and a sale can have both.

By plan status

Disclosed plan · $178M · 99.8%

0.2%

The lighter segment is sales with no plan disclosed in the filing ($270K), including tax-related sales outside a plan.

No plan disclosed · $168K

Sales with no 10b5-1 plan and no tax reference in the filing. $93K of it is Seth Berl. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Seth Berl, Jun 5, 2026

Taxes

$101K of sales (0.1%) cite tax obligations in their footnotes. Example: Seth Berl, Mar 2, 2026

Seller	Shares sold	Proceeds	Under a disclosed plan	Share of total	Sales dates
Jiang Yu President and Chairman, Director	5.47M	$158M	100%	89%	Dec 24, 2025 to Sep 2, 2026
James Walker Chief Executive Officer, Director	394K	$11.5M	100%	6%	Dec 24, 2025 to Sep 3, 2026
Jaisun Garcha Chief Financial Officer	112K	$3.5M	100%	2%	Jan 28, 2026 to Jun 3, 2026
Tsun Law Director	55K	$1.8M	100%	1%	Dec 23, 2025 to Dec 23, 2025
Diane Hare Director	43K	$1.3M	100%	0.7%	Dec 23, 2025 to Jun 3, 2026
Kenny Yu Director	40K	$1.3M	100%	0.7%	Dec 23, 2025 to Dec 23, 2025
Seth Berl Director	7.4K	$195K	0%	0.1%	Mar 2, 2026 to Jun 5, 2026
Florent Heidet Chief Technology Officer	3K	$75K	0%	0.0%	Jun 5, 2026 to Jun 5, 2026

Sales by month

Month	Sale proceeds	Disclosed plan	To cover taxes	No plan disclosed
Oct 2025	$0	$0	$0	$0
Nov 2025	$0	$0	$0	$0
Dec 2025	$55.8M	$55.8M	$0	$0
Jan 2026	$69.8M	$69.8M	$0	$0
Feb 2026	$0	$0	$0	$0
Mar 2026	$101K	$0	$101K	$0
Apr 2026	$0	$0	$0	$0
May 2026	$0	$0	$0	$0
Jun 2026	$43.1M	$42.9M	$0	$168K
Jul 2026	$0	$0	$0	$0
Aug 2026	$0	$0	$0	$0
Sep 2026	$9.2M	$9.2M	$0	$0
Oct 2026	$0	$0	$0	$0

Known gaps and uncertainty9 officers and directors not confirmed

Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Nano Nuclear Energy Inc. are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.

External context: we only cite outside events when a documented connection exists. None is shown for this period.

Sources and methodology69 filings on record, 44 filed in the 12-month period, and how we read them

All 69 Forms 3, 4 and 5 on record for Nano Nuclear Energy Inc. (SEC CIK 1923891), filed from May 6, 2024 to Oct 5, 2026; 44 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 13, 2026. Prices are the ones reported in each filing, often weighted averages.

Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.

Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".

Full methodology

Former or inactive filers (1)No filing in 18 months; last reported balances, not in any total

Name	Last filed	Last reported balance
Winston Chow	May 6, 2024	300,000 shares, last reported balance as of May 6, 2024

Spotted something wrong on this page? Report an error. We check every report against the SEC filing and list what we fix in the corrections log.

Nano Nuclear Energy Inc. insiders sold $178M in the past 12 months. How much of their stake is that?

What stands out

Who sold, and how much of their stake

Selling by month

Recent activity

Common questions

Is the Nano Nuclear Energy Inc. CEO selling stock?

Why are Nano Nuclear Energy Inc. insiders selling?

Are any Nano Nuclear Energy Inc. insiders buying?

The evidence

No plan disclosed · $168K

Taxes

Sales by month