5 June 2026

Iofina plc

("Iofina", the "Company" or the "Group")

(AIM: IOF)

Agreement Signed for Additional Brine Water Supply to Plant IO#11

Iofina plc (AIM: IOF), specialists in the exploration and production of iodine and manufacturers of specialty chemical products, is pleased to announce that it has signed an agreement with a new brine water supply partner to provide additional brine water to its IOsorb® plant, IO#11 ("the Project"), located in Central Oklahoma, which became operational in July 2025.

As a result of this agreement, the plant will be serviced by two independent brine supply partners. The existing facility has sufficient installed capacity to process the additional brine volumes and extract iodine from the new source. The additional brine water is expected to increase crystalline iodine production between 45 and 65 metric tonnes annually at this site once fully operational.

Under the terms of the agreement, Iofina will work with the new partner to construct a pipeline system to transport the brine water to IO#11 and return the brine without iodine back to their disposal site. The financing of the Project will be approximately US$1.5 million and will be fully funded by the Company, as the Group anticipates a rapid payback on this investment. This investment will increase annual production at IO#11 by approximately 50%. Construction for the Project will mostly be managed by our new partner, with preliminary expectations to be completed in Q3 2026.

The Board believes this agreement represents a highly efficient growth opportunity that leverages existing assets and infrastructure while enhancing the long-term production profile of the Central Oklahoma facility.

President and CEO, Dr. Tom Becker, commented:

"We are pleased to announce this new agreement, which increases the production potential of our most recently opened plant, IO#11, in Central Oklahoma. By adding an additional brine water source to an existing facility with available capacity, we will be able to deliver incremental iodine production. Iofina is optimising production at IO#11 concurrently with the construction of our first plant in the Permian Basin. We remain committed to maximising value from our current operating footprint, as well as achieving substantial new iodine production growth."

Enquiries:

Iofina plc

Dr. Tom Becker

CEO & President

Tel: +44 (0)20 3006 3135

Nomad & Broker:

Canaccord Genuity Limited

Henry Fitzgerald-O'Connor/Harry Rees

Tel: +44 (0)20 7523 8000

Financial PR and Media Contact:

Yellow Jersey PR Limited

Charles Goodwin/Shivantha Thambirajah/Maya Brookes

Tel: +44 (0)7747 788 221/+44 (0)7983 521 488

About Iofina:

Iofina plc (AIM: IOF) is a vertically integrated company that specialises in the production of Iodine and the manufacturing of specialty chemical products. Iofina is the second largest producer of iodine in North America and operates the manufacturing entities Iofina Resources and Iofina Chemical.

LEI: 213800QDMFYVRJYYTQ84

ISIN: GB00B2QL5C79

Iofina Resources

Iofina Resources develops, builds, owns, and operates iodine extraction plants using Iofina's WET® IOsorb® technology. Iofina operates eight IOsorb® plants in Oklahoma and consistently uses technology and innovation to improve and expand its operations. A ninth plant is under construction in the Permian Basin.

Iofina Chemical

Iofina Chemical has manufactured high-quality halogen speciality chemicals derived from raw iodine, as well as non-iodine-based products. Iofina Chemical celebrated its 40^th anniversary in 2023 as a preeminent halogen-based specialty chemicals company.

www.iofina.com