Guardian Metal to join FTSE AIM 50 in Sept 2026

Guardian Metal Resources PLC will join the FTSE AIM 50 Index from September 21, 2026, reflecting its growing market presence alongside its Nevada tungsten strategy.

Available on EDGAR 09/08/2026 - 06:52 AM EDT Accepted by SEC EDGAR 09/08/2026 - 06:52 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Guardian Metal Resources PLC (GMTL) announced that it will be added to the FTSE AIM 50 Index, effective from September 21, 2026, following FTSE Russell’s quarterly review of the FTSE AIM UK 50, FTSE AIM 100 and FTSE AIM All-Share indices.

The company is a strategic mineral exploration and development business focused on tungsten projects in Nevada, including Pilot Mountain and Tempiute, and has also completed a listing on the NYSE American on March 20, 2026 as part of its growth strategy.

Key Figures

FTSE AIM 50 inclusion effective date: September 21, 2026 AIM listing start: May 2023 NYSE American listing date: March 20, 2026 +2 more

5 metrics

FTSE AIM 50 inclusion effective date September 21, 2026 Date Guardian Metal Resources PLC becomes a constituent of the FTSE AIM 50 Index

AIM listing start May 2023 CEO notes index inclusion as a milestone since listing on AIM in May 2023

NYSE American listing date March 20, 2026 Completion of U.S. listing on the NYSE American

Number of co-flagship tungsten projects 2 projects Pilot Mountain and Tempiute in Nevada described as co-flagship projects

Title III Defense Production Act support date July 2025 Date of U.S. Department of War investment in Golden Metal Resources (USA) LLC

Key Terms

FTSE AIM 50 Index, Defense Production Act of 1950, Title III, Pre-Feasibility Study (PFS), +1 more

5 terms

FTSE AIM 50 Index market

"the Company will become a constituent of the FTSE AIM 50 Index"

Defense Production Act of 1950 regulatory

"under Title III of the Defense Production Act of 1950, as amended"

A U.S. law that gives the president temporary authority to direct industrial production, prioritize and allocate materials, and speed up manufacturing for national defense needs. For investors it matters because the law can shift demand and revenue quickly by steering government contracts and supply chains toward certain companies or industries, much like a coach reallocating players to meet an urgent game plan, which can boost some firms while disrupting others.

Title III regulatory

"the U.S. Department of War (DoW) under Title III of the Defense Production Act"

Title III is the part of U.S. securities law that allows small companies to raise money from many ordinary investors through regulated crowdfunding platforms. It matters to investors because it opens access to early-stage private deals that were once limited to wealthy backers, while imposing legal limits and disclosure rules to reduce fraud and cap how much each person can invest. Think of it as a supervised online fundraiser with guardrails for both companies and everyday investors.

Pre-Feasibility Study (PFS) technical

"to support the recently completed Pilot Mountain PFS"

A pre-feasibility study (PFS) is an early but structured assessment of a proposed project that estimates its likely costs, revenues, timeline and main technical risks to see if the idea can work economically. It is more detailed than a concept note but less detailed than a full feasibility study, so investors use it as a reality check and to decide whether to commit more time or money. Think of it as a rough blueprint and budget estimate that helps weigh potential returns and key uncertainties before deeper investment.

strategic metal financial

"Tungsten is a strategic metal critical to the defence, energy transition"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Guardian Metal Resources PLC (GMTL) announce in this Form 6-K?

Guardian Metal Resources PLC announced that it will become a constituent of the FTSE AIM 50 Index, effective September 21, 2026, following FTSE Russell’s quarterly review of its AIM indices.

When will GMTL be included in the FTSE AIM 50 Index?

Guardian Metal Resources PLC will be included in the FTSE AIM 50 Index effective September 21, 2026, as a result of FTSE Russell’s quarterly index review.

What is the primary business focus of Guardian Metal Resources PLC (GMTL)?

Guardian Metal Resources PLC is a strategic mineral exploration and development company focused on tungsten in Nevada, USA, aiming to help re-establish domestically mined U.S. tungsten supply for defence and industrial uses.

Which key tungsten projects is GMTL advancing in Nevada?

Guardian Metal Resources PLC is advancing two co-flagship tungsten projects in Nevada: Pilot Mountain, described as one of the largest undeveloped U.S. tungsten deposits, and Tempiute, formerly one of America’s largest producing tungsten operations.

When did Guardian Metal Resources PLC (GMTL) list on the NYSE American?

Guardian Metal Resources PLC completed a U.S. listing on the NYSE American on March 20, 2026, complementing its existing AIM listing as part of its capital markets strategy.

What U.S. government support has GMTL received for its Pilot Mountain project?

In July 2025, the U.S. Department of War under Title III of the Defense Production Act of 1950, as amended, invested in Golden Metal Resources (USA) LLC to support the recently completed Pilot Mountain PFS.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 OF THE SECURITIES EXCHANGE ACT OF 1934

08 September, 2026

Commission File Number 001-43199

Guardian Metal Resources PLC

c/o Orana Corporate LLP

25 Eccleston Place

London SW1W 9NF

United Kingdom

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ___

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ____

Guardian Metal Resources PLC

On 08 September, 2026, Guardian Metal Resources PLC issued a press release titled “Admission to FTSE AIM 50 Index.”

A copy of the press release is attached hereto as Exhibit 99.1.

SIGNATURE

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

Guardian Metal Resources PLC

(Registrant)

Date: 08 September, 2026		By: /s/ Oliver Friesen
		Name: Oliver Friesen
		Title: Chief Executive Officer

Exhibit Index

Exhibit	Description of Exhibit
99.1	Admission to FTSE AIM 50 Index dated 08 September, 2026.

08 September 2026

Guardian Metal Resources plc

('Guardian Metal' or the 'Company')

Admission to FTSE AIM 50 Index

Guardian Metal Resources plc (NYSE.A: GMTL, LON: GMET, OTCQB: GMTLF), a strategic mineral exploration and development company focused on tungsten in Nevada, USA, is pleased to announce that the Company will become a constituent of the FTSE AIM 50 Index, effective from 21 September 2026.

This outcome follows FTSE Russell's quarterly review of the FTSE AIM UK 50, FTSE AIM 100 and FTSE AIM All-Share Indices.

Oliver Friesen, CEO of Guardian Metal, commented:

"Inclusion in the FTSE AIM UK 50 is an important milestone on the journey we began when we listed on AIM in May 2023. It reflects the momentum we have built as we work to reshore mined tungsten production to the United States. I want to thank the shareholders who have supported us along the way, and we are very excited for the road ahead."

For further information visit www.Guardianmetalresources.com or contact the following:

Guardian Metal Resources plc Oliver Friesen (CEO)	Tel: +44 (0) 20 7583 8304
Berenberg Joint Broker and Financial Adviser Jennifer Lee/Ivan Briechle	Tel: +44 (0) 20 3207 7800
Tamesis Partners LLP Joint Broker Charlie Bendon/Richard Greenfield	Tel: +44 (0) 20 3882 2868
Tavistock Financial PR in the UK Emily Moss/Josephine Clerkin	Tel: +44 (0) 7920 3150 / +44 (0) 7788 554035 guardianmetal@tavistock.co.uk
Edelman Smithfield Financial PR in the US	guardianmetal@edelmansmithfield.com

About Guardian Metal Resources

Guardian Metal Resources PLC (NYSE.A: GMTL, LON:GMET, OTCQB:GMTLF) is a strategic mineral exploration company driving the revival of U.S. mined tungsten production and strengthening America's defence metal independence. The Company is advancing two co-flagship tungsten projects, Pilot Mountain, one of the largest undeveloped tungsten deposits in the U.S. and Tempiute, formerly one of America's largest producing tungsten operations, both located in Nevada, one of the top-rated mining jurisdictions in the world.

In July 2025, the U.S. Department of War (DoW) under Title III of the Defense Production Act of 1950, as amended, invested US$6.2M in Golden Metal Resources (USA) LLC, a wholly-owned subsidiary of Guardian Metal Resources PLC, to support the recently completed Pilot Mountain PFS. The Company completed a U.S. listing on the NYSE American on March 20, 2026. 

Tungsten is a strategic metal critical to the defence, energy transition, technology, and industrial sectors. In the context of shifting geopolitical dynamics and tightening Chinese export restrictions, Guardian Metal is well positioned to play a leading role in re-establishing a secure, domestically mined U.S. supply chain for this vital defence metal.