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NGG Alert: Kirby McInerney LLP Encourages National Grid plc Investors to Inquire about Investigation

1. National Grid under investigation for potential securities law violations. 2. NESO reported prior knowledge of electrical fault causing Heathrow fire. 3. ADR price dropped 5.07% due to negative investigation news.

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Why Bearish?

The investigation and prior known faults indicate potential liability and reputation damage, similar to past cases like PG&E, which faced stock price declines after their liability from fires. Historical scrutiny often leads to further legal issues and operational scrutiny, impacting stock performance.

How important is it?

The ongoing investigation and its implications for National Grid's operations and reputation make this news significantly important. Historical legal challenges have shown that such investigations often lead to stock price declines and increased investor wariness.

Why Short Term?

The immediate effects on investor sentiment and stock price are evident. However, long-term impacts will depend on the outcome of the investigation.

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NEW YORK, Oct. 01, 2025 (GLOBE NEWSWIRE) -- The law firm of Kirby McInerney LLP reminds investors its investigation on behalf of National Grid plc (“National Grid” or the “Company”) (NYSE:NGG) investors concerning the Company’s possible violation of the federal securities laws or other unlawful business practices. [LEARN MORE ABOUT THE INVESTIGATION] What Happened? 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. What to Do Next? If you acquired National Grid securities, have information, or would like to learn more about this investigation, contact Thomas W. Elrod of Kirby McInerney LLP by email at investigations@kmllp.com, or fill out the contact form below to discuss your rights or interests with respect to these matters without any cost to you. [CONTACT US] Kirby McInerney LLP is a New York-based plaintiffs’ law firm concentrating in securities, antitrust, whistleblower, and consumer litigation. The firm’s efforts on behalf of shareholders in securities litigation have resulted in recoveries totaling billions of dollars. This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and ethical rules. ContactsKirby McInerney LLPThomas W. Elrod, Esq.212-699-1180https://www.kmllp.cominvestigations@kmllp.com

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