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First Light Fusion completes £25m funding round

Reported by Businessgreen
Apr 21, 2026· 2 min read
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Key Takeaways
  • • First Light Fusion, a University of Oxford spin-out, has completed the first close of a £25 million funding round led by East X Ventures' Starmaker One fusion fund, with significant participation from the UK Atomic Energy Authority (UKAEA).
  • • IP Group plc maintains a 28.3% undiluted beneficial holding in First Light post-round, with an additional 17.3% held through managed funds including Hostplus, demonstrating sustained institutional backing for the inertial fusion energy company.
  • • The capital will accelerate development of First Light's proprietary FLARE Fusion Energy concept, positioning the company as part of a global wave of commercial fusion innovators pursuing reactor-compatible, lower-cost pathways to fusion energy commercialization.
  • • The round reflects growing venture and strategic sector confidence in inertial fusion energy, evidenced by specialist fusion investor participation and UK government support through UKAEA's involvement, signaling alignment with UK long-term energy strategy.
Summary
First Light Fusion, a University of Oxford-backed inertial fusion energy company and portfolio holding of London-listed IP Group plc, has announced the successful first close of its latest funding round at £25 million. The round was led by UK venture firm East X Ventures through its dedicated Starmaker One fusion fund, with a strategically significant co-investment from the UK Atomic Energy Authority (UKAEA), positioning the raise as both a venture capital and government-backed endorsement of the company's technology trajectory.

Following the first close, IP Group maintains a substantial ownership position with 28.3% undiluted beneficial holding and a further 17.3% held through managed funds, including the Hostplus-managed fund. This retained stake reflects continued institutional confidence in First Light's commercial prospects and signals that existing shareholders, including IP Group itself, are participating in the expansion round alongside new venture capital entrants.

The capital infusion will be deployed to accelerate the commercial development of First Light's FLARE Fusion Energy concept, described as a novel, reactor-compatible approach to inertial fusion energy that aims to deliver a simpler, lower-cost pathway to fusion commercialization compared to alternative fusion methodologies. This technology positioning places First Light within the growing cohort of global innovators racing to achieve commercially viable fusion energy solutions.

The UKAEA's participation carries strategic weight beyond its financial commitment, signaling that First Light's inertial fusion approach aligns with UK government energy security and net-zero objectives. According to Greg Smith, Chief Executive of IP Group, the round demonstrates "strong progress" in advancing "a highly differentiated and commercially focused approach to inertial fusion energy," with the specialist investor syndicate and government participation serving as validation of both the underlying technology and its relevance to the UK's long-term energy infrastructure plans.

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Businessgreen First Light Fusion completes £25m funding round