LONDON, UK / ACCESS Newswire / September 8, 2026 / 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:

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.

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SOURCE: Guardian Metal Resources PLC