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Hyliion Holdings Corp.

For the period ended Aug 12, 2025. Filed Aug 12, 2025.

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A notice of a major event between regular reports, such as results, a deal or a change of executives. It is often the first formal record of the news.

Aug 12, 2025 · Filed Aug 12, 2025

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HYLN$2.99+13.7%Stored close · as of Nov 6, 2026
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EX-99.1 · KARNO Power Module Development

KARNO Power Module Development

Hyliion has fully transitioned all LEM production in-house to resolve production and quality issues with a contract manufacturer that had been constraining Early Adopter deployments earlier in the year. LEM output is now ramping up to meet planned Early Adopter deployments in 2025, with additional capacity expansions underway to support higher volumes in 2026.

The Company achieved another key technical milestone by confirming the effectiveness of a new process to remove residual powder from complex printed parts. With this depowdering challenge resolved, Hyliion was able to redesign the regen component of the KARNO Core, moving to a more intricate mesh structure optimized for heat exchange inside the generator. The new design is expected to improve power output and efficiency to expected levels and has been successfully bench-tested in Hyliion’s flow lab. Regens are currently being printed for a complete KARNO Core to validate performance during full-power operation.

The Company continues to expect that all ten Early Adopter customer units will be deployed this year and anticipates that the commercial launch of the KARNO Power Module will extend into 2026, instead of late 2025 as previously planned.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.