19 August 2026

Tekcapital plc

("Tekcapital" or the "Company")

Portfolio Company Update

Vesari Inc. Secures Twelfth Patent Application Covering Predictive Optical

Communications for Satellite-Linked, Geothermal-Powered AI

Tekcapital plc (AIM: TEK), the UK intellectual property investment group focused on creating valuable products that can improve people's lives, is pleased to provide a further update on its portfolio company, Vesari Inc. ("Vesari" - www.vesari.ai), which is developing the technology for a fully integrated, behind-the-meter, geothermal-powered hyperscale AI compute campus.

Further to the Company's announcement of 15 July 2026 regarding the filing and assignment of Vesari's initial eleven non-provisional U.S. patent applications, the Company is pleased to confirm that a twelfth non-provisional U.S. patent application has been filed with the United States Patent and Trademark Office ("USPTO") and assigned to Vesari. The application, "Predictive Optical Communications Using Communications Telemetry as Distributed Atmospheric Sensing" (U.S. Patent Application No. 19/774,832), was filed on 13 August 2026, and all right, title and interest in the invention were assigned to Vesari the same day. Vesari's intellectual property portfolio (the "Patent Portfolio") now comprises twelve non-provisional U.S. patent applications. The Company will update the market with respect to the patent application process as appropriate.

The New Patent Application

The new application extends the Patent Portfolio into the low-Earth-orbit ("LEO") satellite optical data-transmission pillar of Vesari's platform. High-bandwidth free-space optical (laser) communications, including links among ground stations and satellites, can be degraded or interrupted by atmospheric conditions such as turbulence, moisture, cloud and aerosols. The application relates to using the ordinary operational telemetry produced by the optical communication links themselves as a distributed network of atmospheric sensors. By drawing on link-performance and signal-quality information gathered across many optical paths, the approach is designed to help characterise and anticipate atmospheric effects on the optical channel, supporting more predictive, adaptive and resilient communications. The specific systems and methods are described in the patent application and are not disclosed in this announcement.

Application number and filing details as recorded with the USPTO; assignment to Vesari Inc.

Louis Castro, Tekcapital Director, commented:

"Vesari continues to build a robust intellectual property foundation. This twelfth application extends the portfolio into predictive optical communications, the high-bandwidth, satellite-based data-transmission layer that we believe will be essential to distributing AI compute across Vesari's future geothermal-powered campuses. We are pleased with the pace at which Vesari is strengthening its IP position and look forward to updating shareholders as the technology and the Patent Portfolio continue to progress."

About Tekcapital plc

Tekcapital creates value from investing in new, university and corporate developed discoveries that can enhance people's lives. Tekcapital is quoted on the AIM market of the London Stock Exchange (AIM symbol: TEK) and is headquartered in the UK. For more information, please visit www.tekcapital.com.

About Vesari Inc.

Vesari Inc. is developing the technology for a fully integrated, behind-the-meter, geothermal-powered hyperscale AI compute campus for 24/7 carbon-free compute. Its patent-pending, protected architecture is designed to improve the efficiency and economics of AI infrastructure, independent of the public grid. For more information, please visit www.vesari.ai.

Tekcapital holds 51% of the common stock of Vesari Inc.

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Forward-Looking Statements and Risk Factors

This announcement contains forward-looking statements regarding the Company's and Vesari's objectives, strategy and plans, including in relation to the Patent Portfolio. Such statements involve known and unknown risks and uncertainties, many of which are beyond the Company's control, and actual results may differ materially. Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date of this announcement. The Patent Portfolio has been filed but has not yet been examined or granted. There can be no assurance that the applications will result in the grant of patents, or that the scope of any patents granted will be sufficient to provide meaningful commercial protection. Prior to grant, third parties may independently develop or challenge the underlying intellectual property.