Were there any related-party or family relationships in Nano Nuclear Energy’s (NNE) interim appointment?

Nano Nuclear Energy states there are no arrangements or understandings behind James Walker’s interim appointment, no family relationships with any director or executive officer, and no transactions involving him that would require disclosure under Item 404(a) of Regulation S-K, emphasizing independence from related-party influences.

Nano Nuclear (NNE) ousts CTO as CEO becomes Interim Head of Reactor Development

Filing Impact

(Moderate)

Filing Sentiment

(Neutral)

Form Type

8-K

Rhea-AI Filing Summary

Nano Nuclear Energy Inc. removed its Chief Technology Officer and Head of Reactor Development, Dr. Florent Heidet, with the termination effective on June 22, 2026. His employment agreement dated March 6, 2025 was also terminated, other than provisions that survive termination.

The Board of Directors unanimously approved the termination. At the same time, the Board appointed Chief Executive Officer James Walker as Interim Head of Reactor Development. The company states there are no special arrangements behind his appointment, no family relationships with other leaders, and no related-party transactions requiring disclosure.

Positive

None.

Negative

Loss of core technical leadership: Termination of the Chief Technology Officer and Head of Reactor Development removes a key executive overseeing the company’s reactor programs, potentially increasing execution risk until permanent technical leadership is re-established.

Insights

Key technical leader terminated; CEO assumes interim reactor role.

Nano Nuclear Energy removed its Chief Technology Officer and Head of Reactor Development, a role central to its reactor programs. The Board unanimously approved the decision and simultaneously assigned interim reactor leadership responsibilities to CEO James Walker.

Combining CEO and interim reactor development duties concentrates strategic and technical oversight in one individual. This may streamline decisions, but also reduces leadership redundancy in a critical function. Future disclosures about a permanent replacement and organizational structure around reactor development will be important for understanding long-term technical leadership depth.

8-K Event Classification

Item 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers

1 item

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers Governance

Key personnel changes including departures, elections, or appointments of directors and executive officers.

Key Figures

Termination effective date: June 22, 2026 8-K item: Item 5.02 Filing date: June 24, 2026

3 metrics

Termination effective date June 22, 2026 Effective date of CTO and Head of Reactor Development termination

8-K item Item 5.02 Departure and appointment of certain officers

Filing date June 24, 2026 Date the report was signed and filed

Key Terms

Emerging growth company, Item 5.02, Regulation S-K, Interim Head of Reactor Development

4 terms

Emerging growth company regulatory

"Emerging growth company"

An emerging growth company is a recently public or smaller public firm that qualifies for temporary, lighter regulatory and disclosure rules to reduce the cost and effort of being public. For investors, it means the company may provide less historical financial detail and face fewer reporting requirements than larger firms, so it can grow more quickly but also carries higher uncertainty—like buying a promising early-stage product with fewer user reviews.

Item 5.02 regulatory

"Item 5.02 Departure of Directors or Certain Officers; Election of Directors"

Regulation S-K regulatory

"transactions involving Mr. Walker that would require disclosure under Item 404(a) of Regulation S-K"

A set of U.S. Securities and Exchange Commission rules that tell public companies which narrative and qualitative details must be disclosed in filings, such as risk factors, management discussion, executive pay, legal proceedings and business description. Think of it as a standardized checklist or blueprint that ensures investors get the same types of background information from every company so they can compare risks, management quality and strategy before making investment decisions.

Interim Head of Reactor Development financial

"appointed James Walker, the Company’s Chief Executive Officer, to serve as the Company’s Interim Head of Reactor Development"

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Understanding 8-K Material Events →

Available on EDGAR 06/25/2026 - 06:02 AM Accepted by SEC EDGAR 06/24/2026 - 09:09 PM

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): June 24, 2026 (June 22, 2026)

Nano Nuclear Energy Inc.

(Exact name of registrant as specified in its charter)

Nevada

001-42044

88-0861977

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

10 Times Square, 30th Floor

New York, New York 10018

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (212) 634-9206

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

	☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

	☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

	☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

	☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered

Common Stock, par value $0.0001 per share	NNE	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On and effective as of June 22, 2026, Dr. Florent Heidet’s employment and service as the Chief Technology Officer and Head of Reactor Development of Nano Nuclear Energy Inc, a Nevada corporation (the “Company”), was terminated (“Termination”). The Termination included the Company’s termination of Dr. Heident’s employment agreement with the Company, dated March 6, 2025 (except for those provisions of such agreement which survive termination). The Termination was unanimously approved by the Company’s Board of Directors (the “Board”).

Also, effective as of the Termination, the Board appointed James Walker, the Company’s Chief Executive Officer, to serve as the Company’s Interim Head of Reactor Development. There are no arrangements or understandings between Mr. Walker and any other persons pursuant to which Mr. Walker was appointed as Interim Head of Reactor Development. There are no family relationships between Mr. Walker and any director or executive officer of the Company, and there are no transactions involving Mr. Walker that would require disclosure under Item 404(a) of Regulation S-K.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: June 24, 2026	NANO Nuclear Energy Inc.

	By:	/s/ Jaisun Garcha
	Name:	Jaisun Garcha
	Title:	Chief Financial Officer

Source: View Original Filing on SEC EDGAR

FAQ

What executive change did Nano Nuclear Energy (NNE) announce?

Nano Nuclear Energy terminated Dr. Florent Heidet as Chief Technology Officer and Head of Reactor Development effective June 22, 2026. His employment agreement from March 6, 2025 was ended except for provisions that survive termination, signaling a full separation from his executive role.

Who will lead reactor development at Nano Nuclear Energy (NNE) after the CTO termination?

After Dr. Heidet’s termination, CEO James Walker was appointed Interim Head of Reactor Development. The Board approved this change effective June 22, 2026, temporarily combining overall corporate leadership and reactor program oversight in the same executive while a permanent structure is not described.

Did Nano Nuclear Energy (NNE) explain why its CTO was terminated?

The disclosure states that Dr. Florent Heidet’s employment and service were terminated effective June 22, 2026, but it does not provide any reasons. It focuses on the Board’s unanimous approval and the resulting leadership changes, without elaborating on performance, strategic, or other causes.

What corporate form and listing does Nano Nuclear Energy (NNE) have?

Nano Nuclear Energy is a Nevada corporation whose common stock trades on The Nasdaq Stock Market LLC under the symbol NNE. The company identifies as an emerging growth company under applicable SEC rules, which can affect reporting and regulatory requirements compared with larger issuers.

Filing Exhibits & Attachments

3 documents