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Finance

UK's Melrose shares drop 6% after chemical incident at California plant

Published by Global Banking & Finance Review

Posted on May 26, 2026

2 min read

· Last updated: May 26, 2026

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GKN Aerospace owner Melrose drops 7% after California plant incident

Incident Overview and Market Impact

May 26 (Reuters) - Shares in GKN Aerospace owner Melrose Industries fell as much as 7% on Tuesday after an overheating chemical tank at GKN's Garden Grove facility in California triggered an emergency response and evacuation orders over the weekend. 

Operational Response and Recovery

Melrose said GKN Aerospace is working with customers on operational recovery and supply plans as response operations continue.

Facility Details

The U.S. site, which makes aircraft windshields and specialty aerospace plastics, among other things, generated £136 million ($183.29 million) in sales in fiscal 2025 and has 500 employees.

Stock Market Reaction

Shares in Melrose were down about 4.6% by 0720 GMT, making it the biggest loser on the benchmark London FTSE 100 and the pan-European STOXX 600 indices. 

Emergency Response Details

Potential Risks

Officials had warned that the tank could rupture, spilling up to 7,000 gallons (26,500 litres) of toxic material, or explode, thereby endangering other tanks on the GKN site. On Monday, the firefighters said the tank was no longer at risk of exploding after a crack relieved pressure.

Evacuation and Chemical Details

Methyl Methacrylate Incident

On Thursday, a thermal issue was identified in a tank holding methyl methacrylate, a chemical used in plastics and manufacturing, prompting an emergency response and mandatory evacuation orders for parts of the surrounding community.

Financial Impact and Disclosure

Melrose did not disclose any financial impact from the incident or whether costs would be covered by insurance.

Additional Information

($1 = 0.7420 pounds)

(Reporting by Nithyashree R B and Simone Lobo in Bengaluru; Editing by Mrigank Dhaniwala and Rashmi Aich)

Key Takeaways

  • A storage tank containing 6,000–7,000 gallons of highly flammable methyl methacrylate at GKN’s Garden Grove facility overheated last week, prompting evacuations of up to 50,000 residents across multiple Orange County cities. (apnews.com)
  • Authorities discovered a crack in the tank over the weekend that relieved pressure and cooled the chemical, reducing the risk of a major explosion—but officials warn a smaller blast, fire or leak remains possible. (apnews.com)
  • The tank held critical materials for aerospace applications—GKN Aero generates approximately £136 million in annual sales from this site—and the disruption raised concerns about supply‑chain impacts. (apnews.com)

References

Frequently Asked Questions

Why did Melrose Industries shares fall by 6%?
Melrose shares dropped due to a chemical incident at its GKN Aerospace plant in Garden Grove, California, leading to emergency responses and operational disruptions.
What happened at the GKN Aerospace Garden Grove facility?
An overheating chemical tank at the facility triggered emergency responses and evacuation orders over the weekend.
How is GKN Aerospace responding to the incident?
GKN Aerospace is coordinating with customers on recovery and supply plans while response operations are ongoing.
What products are made at the Garden Grove site?
The site manufactures aircraft windshields and specialty aerospace plastics, among other products.
How much sales did the Garden Grove facility generate in fiscal 2025?
The facility generated £136 million ($183.29 million) in sales during fiscal year 2025.

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