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Equibles

6-K

National Grid PLC (NGG)

6-K 2025-05-22 For: 2025-05-22
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Added on April 07, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

__________________________________________________

FORM 6-K

__________________________________________________

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

Date: 22 May 2025

Commission File Number: 001-14958

__________________________________________________

NATIONAL GRID plc

(Translation of registrant’s name into English)

England and Wales

(Jurisdiction of Incorporation)

__________________________________________________

1-3 Strand, London, WC2N 5EH, United Kingdom

(Address of principal executive office)

__________________________________________________

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

☒  Form 20-F      ☐  Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ☐

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3- 2(b) under the Securities Exchange Act of 1934.  ☐  Yes    ☒  No

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): n/a

EXHIBIT INDEX

Exhibit No. Description
99.1 Exhibit<br>99.1 Announcement sent to the London Stock Exchange on 22 May 2025<br>— Holding(s) in Company

Exhibit 99.1

22 May 2025

National Grid plc ('National Grid' or 'Company')

Notification of Major Interest in National Grid Ordinary Shares

National Grid has received a notification on Form TR-1 from Bank of America Corporation that its total interest in National Grid voting ordinary shares is as shown below.

TR-1: Standard form for notification of major holdings

  1. Issuer Details

ISIN

GB00BDR05C01

Issuer Name

NATIONAL GRID PLC

UK or Non-UK Issuer

UK
  1. Reason for Notification
An acquisition or disposal of voting rights; An acquisition or<br>disposal of financial instruments
  1. Details of person subject to the notification obligation

Name

Bank of America Corporation

City of registered office (if applicable)

Country of registered office (if applicable)

US
  1. Details of the shareholder

Full name of shareholder(s) if different from the person(s) subject to the notification obligation, above

City of registered office (if applicable)

Country of registered office (if applicable)

  1. Date on which the threshold was crossed or reached
19-May-2025
  1. Date on which Issuer notified
21-May-2025
  1. Total positions of person(s) subject to the notification obligation
%<br>of voting rights attached to shares (total of 8.A) %<br>of voting rights through financial instruments (total of 8.B 1 +<br>8.B 2) Total<br>of both in % (8.A + 8.B) Total<br>number of voting rights held in issuer
Resulting situation<br>on the date on which threshold was crossed or reached 2.972203 2.611212 5.583415 273657759
Position of<br>previous notification (if applicable) 1.502416 0.319666 1.822082
  1. Notified details of the resulting situation on the date on which the threshold was crossed or reached

8A. Voting rights attached to shares

Class/Type of shares ISIN code(if possible) Number of direct voting rights (DTR5.1) Number of indirect voting rights (DTR5.2.1) % of direct voting rights (DTR5.1) % of indirect voting rights (DTR5.2.1)
GB00BDR05C01 124303665 2.536157
US6362744095 21371773 0.436046
Sub<br>Total 8.A 145675438 2.972203%

8B1. Financial Instruments according to (DTR5.3.1R.(1) (a))

Type of financial instrument Expiration date Exercise/conversion period Number of voting rights that may be acquired if the instrument is<br>exercised/converted % of voting rights
Right<br>to Recall N/A N/A 349644 0.007134
Physical Call<br>Option 21/11/2025 N/A 1 0.000000
Physical<br>Option 16/01/2026 N/A 10477 0.000214
Sub<br>Total 8.B1 360122 0.007348%

8B2. Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))

Type of financial instrument Expiration date Exercise/conversion period Physical or cash settlement Number of voting rights % of voting rights
Swaps 30/05/2025 N/A Cash 19225 0.000393
Swaps 30/06/2025 N/A Cash 1766 0.000036
Swaps 30/07/2025 N/A Cash 90478 0.001846
Swaps 29/08/2025 N/A Cash 109466 0.002233
Swaps 08/09/2025 N/A Cash 16481 0.000336
Swaps 31/10/2025 N/A Cash 193 0.000004
Swaps 28/11/2025 N/A Cash 58000 0.001184
Swaps 22/12/2025 N/A Cash 933465 0.019045
Swaps 31/12/2025 N/A Cash 223388 0.004559
Swaps 30/01/2026 N/A Cash 265958 0.005426
Swaps 03/03/2026 N/A Cash 2600086 0.053049
Swaps 06/03/2026 N/A Cash 124217 0.002534
Swaps 31/03/2026 N/A Cash 108802569 2.219889
Swaps 07/04/2026 N/A Cash 78955 0.001611
Swaps 28/04/2026 N/A Cash 77646 0.001584
Swaps 30/04/2026 N/A Cash 1996825 0.040741
Swaps 15/06/2026 N/A Cash 349765 0.007136
Swaps 19/06/2026 N/A Cash 10193437 0.207976
Swaps 25/06/2026 N/A Cash 74722 0.001525
Swaps 31/07/2026 N/A Cash 444113 0.009061
Swaps 25/02/2027 N/A Cash 275 0.000006
Swaps 19/04/2027 N/A Cash 12052 0.000246
Swaps 26/04/2027 N/A Cash 113584 0.002317
Swaps 01/06/2027 N/A Cash 6980 0.000142
Swaps 04/06/2027 N/A Cash 95480 0.001948
Swaps 15/02/2028 N/A Cash 300586 0.006133
Swaps 07/05/2030 N/A Cash 314516 0.006417
Options 21/05/2025 N/A Cash 14432 0.000294
Options 12/06/2025 N/A Cash 303539 0.006193
Sub<br>Total 8.B2 127622199 2.603864%
  1. Information in relation to the person subject to the notification obligation
2. Full chain of controlled undertakings through which the voting<br>rights and/or the financial instruments are effectively held<br>starting with the ultimate controlling natural person or legal<br>entities (please add additional rows as necessary)
Ultimate controlling person Name of controlled undertaking % of voting rights if it equals or is higher than the notifiable<br>threshold % of voting rights through financial instruments if it equals or is<br>higher than the notifiable threshold Total of both if it equals or is higher than the notifiable<br>threshold
--- --- --- --- ---
Bank of<br>America Corporation Bank of<br>America, NA
Bank of<br>America Corporation BofA<br>Securities, Inc.
Bank of<br>America Corporation Managed<br>Account Advisors, LLC
Bank of<br>America Corporation Merrill<br>Lynch, Pierce, Fenner & Smith Inc.
Bank of<br>America Corporation U.S.<br>Trust Co of Delaware
Bank of<br>America Corporation Merrill<br>Lynch International 5.048987%
Bank of<br>America Corporation BofA<br>Securities Europe SA
  1. In case of proxy voting

Name of the proxy holder

The number and % of voting rights held

The date until which the voting rights will be held

  1. Additional Information

  2. Date of Completion

21-May-2025
  1. Place Of Completion
United Kingdom

This notice is in compliance with National Grid's obligations under the Disclosure and Transparency Rules.

Julian Baddeley

Group Company Secretary

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

NATIONAL GRID<br>plc
By: Beth Melges
Beth Melges<br><br><br>Head of Plc Governance

Date: 22 May 2025

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