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Ongoing incident at Garden Grove facility
Melrose Industries PLC has reported an ongoing incident at its GKN Aerospace facility in Garden Grove, California, involving a thermal issue with a storage tank of methyl methacrylate, a chemical used in aerospace acrylic materials. While emergency services and technical specialists worked to resolve the situation, mandatory evacuations were issued for surrounding communities as a precautionary measure. As of May 25th, authorities confirmed no injuries, leaks, or contamination, and the evacuation area has been significantly reduced. GKN is collaborating with customers on operational recovery and supply plans, with the Garden Grove facility having generated £136 million in sales for the financial year 2025. Disclaimer*
About this update from Melrose Industries Plc
26 May 2026 MELROSE INDUSTRIES PLC Ongoing incident at Garden Grove facility in California On Thursday 21 May, a thermal issue was identified regarding a storage tank containing methyl methacrylate (MMA) at GKN Aerospace's (GKN) Garden Grove facility in the US. MMA is a chemical used in the manufacture of high-strength aerospace acrylic materials. Action was taken immediately by GKN employees and emergency services notified. As conditions evolved through Friday 22 May, the Orange County Fire Authority (OCFA) made the precautionary decision to issue mandatory evacuation orders for portions of the surrounding community to protect public safety while response operations continued. Since then, technical specialists, the emergency services and the relevant authorities have continued to work closely to resolve the situation, with a focus on ensuring the safety of the local community, employees and everyone else involved. As a result of the positive progress that has been made over the last few days and the reduced risk, on 25 May, the OCFA announced that the mandatory evacuation area had been significantly reduced with immediate effect. At 6pm local time on 25 May, the local authorities confirmed that no injuries, leaks or contamination have occurred. GKN is working closely with customers on operational recovery and supply plans. The progress made over the last few days is testament to the continued skill and dedication of all the support teams and services involved. Further announcements will be issued as appropriate. Enquiries: Investor Relations: Mat Wootton +44 (0) 7483 961 233 [email protected] Media: Simon Sporborg, Tom Pigott / Brunswick: +44 (0) 207 404 5959 [email protected] About Garden Grove The Garden Grove facility in California, operated by GKN Aerospace Transparency Systems, Inc., designs, manufactures and provides aftermarket support for advanced military and commercial transparencies employing around 500 people. For financial year 2025, sales generated by the site were £136 million.
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