Graphene & Solar (GSTX) names interim CFO after Halstead resigns

Rhea-AI Filing Summary

Graphene & Solar Technologies Limited reported that David Halstead resigned as Chief Financial Officer and as a member of the Board of Directors, effective April 21, 2026. The company states his resignation is not due to any disagreement regarding operations, policies, or practices.

On the same date, the Board appointed Kristine Woo as interim Chief Financial Officer, effective immediately, and plans to begin a search for a permanent CFO. Woo will be compensated under existing executive compensation policies and has no related-party arrangements, family relationships, or transactions requiring disclosure under Regulation S-K Item 404(a).

Insights

Corporate governance analyst

CFO and director exit balanced by immediate interim appointment.

The company announces the resignation of CFO and director David Halstead effective April 21, 2026, while affirming that it was not due to disagreements over operations, policies, or practices. This language aims to limit concerns about underlying disputes.

At the same time, the Board appointed Kristine Woo as interim CFO, with compensation aligned to existing executive policies. The company plans a search for a permanent CFO, suggesting a transitional phase in financial leadership rather than a completed succession.

No special arrangements, family relationships, or transactions under Regulation S-K Item 404(a) are disclosed, indicating this is a straightforward leadership change. Future filings may clarify the timing and profile of the permanent CFO hire.

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

Commission File Number: 333-174194 CFO resignation effective date: April 21, 2026 Interim CFO appointment date: April 21, 2026

3 metrics

Commission File Number 333-174194 SEC registration reference for the company

CFO resignation effective date April 21, 2026 Effective date of David Halstead’s resignation as CFO and director

Interim CFO appointment date April 21, 2026 Date Kristine Woo was appointed interim Chief Financial Officer

Key Terms

interim Chief Financial Officer, Emerging growth company, Item 5.02, Regulation S-K, +1 more

5 terms

interim Chief Financial Officer financial

"the Board of Directors of the Company appointed Kristine Woo to serve as the Company’s interim Chief Financial Officer"

An interim chief financial officer is a temporary leader responsible for managing a company's financial activities, such as budgeting, financial planning, and reporting, during a transitional period. Think of it as filling in for a key manager until a permanent replacement is found. For investors, this role is important because it ensures financial stability and clear guidance during times of change or uncertainty.

Emerging growth company regulatory

"Emerging growth company 1 Item 5.02."

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; Appointment of Certain Officers"

Regulation S-K regulatory

"no transactions requiring 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.

Item 404(a) regulatory

"no transactions requiring disclosure under Item 404(a) of Regulation S-K"

Understanding 8-K Material Events →

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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): April 21, 2026

Commission File Number: 333-174194

GRAPHENE & SOLAR TECHNOLOGIES LIMITED

(Exact name of registrant as specified in its charter)

colorado		27-2888719
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)

11201 North Tatum Blvd., Suite 300

 Phoenix, AZ 85028

(Address of principal executive offices, including Zip Code)

(602) 388-8335

(Issuer’s telephone number, including area code)

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 2459.244a-12)

☐      Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 2459.244d-2(b))

☐      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 2459.243e-4c))

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

Title of Each Class		Trading Symbol		Name of Each Exchange on which registered
NONE		NONE		NONE

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.  ☐

 1

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

On April 21, 2026, David Halstead resigned as Chief Financial Officer and as a member of the Board of Directors (the "Board") of Graphene & Solar Technologies Limited (the "Company"), effective April 21, 2026.

David Halstead's resignation is not the result of any disagreement or issues relating to the Company's operations, policies, or practices.

On April 21, 2026, the Board of Directors of the Company appointed Kristine Woo to serve as the Company’s interim Chief Financial Officer, effective immediately. The Company plans to promptly initiate a search for a permanent successor to be Chief Financial Officer.

Kristine Woo will receive compensation consistent with the Company's executive compensation policies.

There are no arrangements or understandings between Kristine Woo and any other person pursuant to which she was selected as interim Chief Financial Officer, no family relationships with any director or executive officer of the Company, and no transactions requiring disclosure under Item 404(a) of Regulation S-K.

 2

SIGNATURES

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.

GRAPHENE & SOLAR TECHNOLOGIES LIMITED

Date: April 23, 2026

By: /s/ Jason May

Name: Jason May

Title: Chief Executive Officer and Director

 3

FAQ

What leadership change did Graphene & Solar Technologies (GSTX) disclose?

Graphene & Solar Technologies disclosed that David Halstead resigned as Chief Financial Officer and as a member of the Board of Directors, effective April 21, 2026. The company simultaneously appointed Kristine Woo as interim CFO to maintain continuity in its financial leadership structure.

When was the new interim CFO appointed at Graphene & Solar Technologies (GSTX)?

The Board appointed Kristine Woo as interim Chief Financial Officer on April 21, 2026, effective immediately. Her appointment coincided with David Halstead’s same‑day resignation as CFO and director, providing an immediate replacement while the company begins searching for a permanent successor.

Did David Halstead’s resignation from GSTX involve any disagreement with the company?

The company states that David Halstead’s resignation as CFO and director was not the result of any disagreement or issues related to its operations, policies, or practices. This wording indicates the departure is characterized as non‑contentious within the company’s official disclosure.

Are there any special arrangements behind Kristine Woo’s appointment at GSTX?

The company reports no arrangements or understandings with any person under which Kristine Woo was selected as interim CFO. It also notes no family relationships with directors or officers and no transactions requiring disclosure under Item 404(a) of Regulation S‑K.

How will interim CFO Kristine Woo be compensated at Graphene & Solar Technologies?

Kristine Woo will receive compensation consistent with Graphene & Solar Technologies’ existing executive compensation policies. The filing does not list specific amounts, focusing instead on confirming she will be treated under the same framework as other executives at the company.

Is Graphene & Solar Technologies (GSTX) searching for a permanent CFO?

Yes. The company states it plans to promptly initiate a search for a permanent successor to the Chief Financial Officer role. During this transition period, interim CFO Kristine Woo will handle the company’s financial leadership responsibilities under the Board’s oversight.

Filing Exhibits & Attachments

3 documents

Other Documents

• EX-101 XBRL SCHEMA FILE 2.9 KB
• EX-101 XBRL LABEL FILE 33.4 KB
• EX-101 XBRL PRESENTATION FILE 21.8 KB