# EDGAR Filing Document

**Accession Number:** 0001004315
**File Stem:** 0001654954-25-006363
**Filing Date:** 2025-6
**Character Count:** 9841
**Document Hash:** b18c866bc0785fc63184a9720fe1c3c7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001654954-25-006363.hdr.sgml**: 20250602

**ACCESSION NUMBER**: 0001654954-25-006363

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250602

**FILED AS OF DATE**: 20250602

**DATE AS OF CHANGE**: 20250602

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NATIONAL GRID PLC
- **CENTRAL INDEX KEY:** 0001004315
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS TRANSMISSION [4922]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 980367158
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14958
- **FILM NUMBER:** 251013088

**BUSINESS ADDRESS:**
- **STREET 1:** 1-3 STRAND
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** WC2N 5EH
- **BUSINESS PHONE:** (44) 207 004 3220

**MAIL ADDRESS:**
- **STREET 1:** 1-3 STRAND
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** WC2N 5EH

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NATIONAL GRID TRANSCO PLC
- **DATE OF NAME CHANGE:** 20021121

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NATIONAL GRID GROUP PLC
- **DATE OF NAME CHANGE:** 19991007

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NATIONAL GRID HOLDING PLC
- **DATE OF NAME CHANGE:** 19991007

**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: 30 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 99.1 Announcement sent to the London Stock Exchange on 30 May 2025 — Holding(s) in Company |

---

Exhibit 99.1

 **30 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<br>

 **Issuer Name**

NATIONAL GRID PLC<br>

 **UK or Non-UK Issuer**

UK<br>

 **2. Reason for Notification**

An acquisition or disposal of financial instruments<br>

 **3. Details of person subject to the notification obligation**

 **Name**

Bank of America Corporation<br>

 **City of registered office (if applicable)**

 **Country of registered office (if applicable)**

US<br>

 **4. 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)**

 **5. Date on which the threshold was crossed or reached**

29-May-2025<br>

 **6. Date on which Issuer notified**

30-May-2025<br>

 **7. Total positions of person(s) subject to the notification obligation**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | &nbsp;&nbsp;&nbsp; **% of voting rights attached to shares (total of 8.A)** | &nbsp;&nbsp;&nbsp; **% of voting rights through financial instruments (total of 8.B 1 + 8.B 2)** | &nbsp;&nbsp;&nbsp; **Total of both in % (8.A + 8.B)** | &nbsp;&nbsp;&nbsp; **Total number of voting rights held in issuer** |
| &nbsp;&nbsp;&nbsp; Resulting situation on the date on which threshold was crossed or reached<br>| &nbsp;&nbsp;&nbsp;&nbsp; 2.521433<br>| &nbsp;&nbsp;&nbsp;&nbsp; 0.055402<br>| &nbsp;&nbsp;&nbsp;&nbsp; 2.576835<br>| &nbsp;&nbsp;&nbsp; 126297425<br>|
| &nbsp;&nbsp;&nbsp; Position of previous notification (if applicable)<br>| &nbsp;&nbsp;&nbsp;&nbsp; 2.941402<br>| &nbsp;&nbsp;&nbsp;&nbsp; 2.657883<br>| &nbsp;&nbsp;&nbsp;&nbsp; 5.599285<br>|  |

---

 **8. 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)** |
| &nbsp;&nbsp;&nbsp; GB00BDR05C01<br>|  | &nbsp;&nbsp;&nbsp; 99612093<br>|  | &nbsp;&nbsp;&nbsp;&nbsp; 2.032377<br>|
| &nbsp;&nbsp;&nbsp; US6362744095<br>|  | &nbsp;&nbsp;&nbsp; 23969937<br>|  | &nbsp;&nbsp;&nbsp;&nbsp; 0.489056<br>|
| Sub Total 8.A | &nbsp;&nbsp;&nbsp; 123582030 | &nbsp;&nbsp;&nbsp; 123582030 | &nbsp;&nbsp;&nbsp; 2.521433% | &nbsp;&nbsp;&nbsp; 2.521433% |

---

 **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 exercised/converted** | **% of voting rights** |
| &nbsp;&nbsp;&nbsp; Right to Recall<br>| &nbsp;&nbsp;&nbsp; n/a<br>| &nbsp;&nbsp;&nbsp; n/a<br>| &nbsp;&nbsp;&nbsp; 450000<br>| &nbsp;&nbsp;&nbsp;&nbsp; 0.009181<br>|
| Sub Total 8.B1 |  |  | &nbsp;&nbsp;&nbsp; 450000<br>| &nbsp;&nbsp;&nbsp; 0.009181%<br>|

---

 **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** |
| &nbsp;&nbsp;&nbsp; Swaps<br>| &nbsp;&nbsp;&nbsp; 08/09/2025<br>| &nbsp;&nbsp;&nbsp; n/a<br>| &nbsp;&nbsp;&nbsp; Cash<br>| &nbsp;&nbsp;&nbsp; 16481<br>| &nbsp;&nbsp;&nbsp;&nbsp; 0.000336<br>|
| &nbsp;&nbsp;&nbsp; Swaps<br>| &nbsp;&nbsp;&nbsp; 26/11/2025<br>| &nbsp;&nbsp;&nbsp; n/a<br>| &nbsp;&nbsp;&nbsp; Cash<br>| &nbsp;&nbsp;&nbsp; 46007<br>| &nbsp;&nbsp;&nbsp;&nbsp; 0.000939<br>|
| &nbsp;&nbsp;&nbsp; Swaps<br>| &nbsp;&nbsp;&nbsp; 03/03/2026<br>| &nbsp;&nbsp;&nbsp; n/a<br>| &nbsp;&nbsp;&nbsp; Cash<br>| &nbsp;&nbsp;&nbsp; 2009443<br>| &nbsp;&nbsp;&nbsp;&nbsp; 0.040998<br>|
| &nbsp;&nbsp;&nbsp; Swaps<br>| &nbsp;&nbsp;&nbsp; 19/06/2026<br>| &nbsp;&nbsp;&nbsp; n/a<br>| &nbsp;&nbsp;&nbsp; Cash<br>| &nbsp;&nbsp;&nbsp; 193437<br>| &nbsp;&nbsp;&nbsp;&nbsp; 0.003947<br>|
| &nbsp;&nbsp;&nbsp; Swaps<br>| &nbsp;&nbsp;&nbsp; 31/07/2026<br>| &nbsp;&nbsp;&nbsp; n/a<br>| &nbsp;&nbsp;&nbsp; Cash<br>| &nbsp;&nbsp;&nbsp; 27<br>| &nbsp;&nbsp;&nbsp;&nbsp; 0.000001<br>|
| Sub Total 8.B2 |  |  |  | &nbsp;&nbsp;&nbsp; 2265395<br>| &nbsp;&nbsp;&nbsp; 0.046221%<br>|

---

 **9. Information in relation to the person subject to the notification obligation**

2. Full chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entities (please add additional rows as necessary)<br>

---

| | | | | |
|:---|:---|:---|:---|:---|
| **Ultimate controlling person** | **Name of controlled undertaking** | **% of voting rights if it equals or is higher than the notifiable threshold** | **% of voting rights through financial instruments if it equals or is higher than the notifiable threshold** | **Total of both if it equals or is higher than the notifiable threshold** |
| &nbsp;&nbsp;&nbsp; Bank of America Corporation<br>| &nbsp;&nbsp;&nbsp; Bank of America, National Association<br>|  |  |  |
| &nbsp;&nbsp;&nbsp; Bank of America Corporation<br>| &nbsp;&nbsp;&nbsp; BofA Securities, Inc.<br>|  |  |  |
| &nbsp;&nbsp;&nbsp; Bank of America Corporation<br>| &nbsp;&nbsp;&nbsp; Managed Account Advisors, LLC<br>|  |  |  |
| &nbsp;&nbsp;&nbsp; Bank of America Corporation<br>| &nbsp;&nbsp;&nbsp; Merrill Lynch, Pierce, Fenner & Smith Inc.<br>|  |  |  |
| &nbsp;&nbsp;&nbsp; Bank of America Corporation<br>| &nbsp;&nbsp;&nbsp; U.S. Trust Co of Delaware<br>|  |  |  |

---

 **10. 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**

 **11. Additional Information**

 **12. Date of Completion**

30-May-2025<br>

 **13. Place Of Completion**

United Kingdom<br>

 **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.

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp; NATIONAL GRID plc | &nbsp;&nbsp;&nbsp; NATIONAL GRID plc |
|  ***By:***<br>|  ***Beth Melges***<br>|
|  | Beth Melges<br> Head of Plc Governance<br>|

---

Date: 30 May 2025