Notification of Major Interest in National Grid Ordinary Shares by JPMorgan Chase & Co.

National Grid plc has received a notification from JPMorgan Chase & Co. regarding its total interest in National Grid voting ordinary shares. The notification, submitted on Form TR-1, indicates that JPMorgan Chase & Co.'s total interest in National Grid voting ordinary shares is 5.055749%, with 4.885012% from direct voting rights and 0.170737% through financial instruments. The total number of voting rights held in the issuer is 188,151,767.

JPMorgan Chase & Co. holds these voting rights through its subsidiaries, including J.P. Morgan Securities plc and J.P. Morgan Securities LLC. The notification also details the financial instruments held by JPMorgan Chase & Co., such as depository receipts and cash-settled equity swaps, which contribute to the overall voting rights.

The notification provides a comprehensive breakdown of the financial instruments held by JPMorgan Chase & Co., including the expiration dates, cash settlement details, and the corresponding percentage of voting rights for each instrument. Additionally, it outlines the full chain of controlled undertakings through which the voting rights and financial instruments are effectively held, starting with the ultimate controlling natural person or legal entities.

This notification is a standard form for the disclosure of major holdings and provides transparency regarding JPMorgan Chase & Co.'s interest in National Grid plc.