National Grid plc

Case Overview
Status: | Status: Investigating |
Company Name: | Company Name: National Grid plc |
Ticker: | Ticker: NGG |
Related Attorneys: | Lead Attorneys: Thomas W. Elrod |
Related Practices: | Related Practices: Securities |
The law firm of Kirby McInerney LLP is investigating potential claims against National Grid USA Service Company, Inc. (“National Grid” or the “Company”) (NYSE: NGG). The investigation concerns whether National Grid and/or certain of its officers have violated the federal securities laws and/or engaged in other unlawful business practices.
On July 1, 2025, the United Kingdom’s energy system operator, National Energy System Operator (“NESO”), published a report summarizing the findings of its investigation into the March 20, 2025 fire that caused Heathrow Airport to shut down. NESO’s report stated that the fire was caused by a known fault at an electrical substation owned by National Grid, which had been aware of the problem since 2018 but failed to fix it. On this news, the price of National Grid’s American Depositary Receipt (“ADR”) declined by $3.77 per ADR, or approximately 5.07%, from $74.38 per share on July 1, 2025 to close at $70.61 on July 2, 2025.
On July 1, 2025, the United Kingdom’s energy system operator, National Energy System Operator (“NESO”), published a report summarizing the findings of its investigation into the March 20, 2025 fire that caused Heathrow Airport to shut down. NESO’s report stated that the fire was caused by a known fault at an electrical substation owned by National Grid, which had been aware of the problem since 2018 but failed to fix it. On this news, the price of National Grid’s American Depositary Receipt (“ADR”) declined by $3.77 per ADR, or approximately 5.07%, from $74.38 per share on July 1, 2025 to close at $70.61 on July 2, 2025.