National Grid (NYSE: NGG) sets 5,026,800,385 voting-share base

Rhea-AI Filing Summary

NATIONAL GRID PLC (NGG) reported several administrative updates. As of 31 July 2026, registered capital comprised 5,249,831,589 ordinary shares, including 223,031,204 treasury shares, leaving 5,026,800,385 shares with voting rights, which shareholders may use as the denominator for UK disclosure threshold calculations.

National Grid and National Grid Electricity Transmission plc published a Supplementary Prospectus dated 4 August 2026 and a new Prospectus dated 17 August 2026 for their €20,000,000,000 Euro Medium Term Note Programme, both approved by the UK Financial Conduct Authority and available via the FCA’s National Storage Mechanism. The company also disclosed that Chief Financial Officer Andy Agg acquired 12 ordinary shares on 7 August 2026 at GBP 11.9781 per share under the Share Incentive Plan.

Key Figures

Registered capital: 5,249,831,589 ordinary shares Treasury shares: 223,031,204 ordinary shares Shares with voting rights: 5,026,800,385 ordinary shares +3 more

6 metrics

Registered capital 5,249,831,589 ordinary shares As of 31 July 2026

Treasury shares 223,031,204 ordinary shares Held as treasury shares as of 31 July 2026

Shares with voting rights 5,026,800,385 ordinary shares Used as denominator for UK disclosure threshold calculations

Euro Medium Term Note Programme size €20,000,000,000 Programme for National Grid plc and National Grid Electricity Transmission plc

PDMR purchase volume 12 ordinary shares Monthly purchase under the Share Incentive Plan by CFO Andy Agg

PDMR purchase price GBP 11.9781 per share Price paid on 7 August 2026 on the London Stock Exchange

Key Terms

treasury shares, Euro Medium Term Note Programme, Supplementary Prospectus, Prospectus, +2 more

6 terms

treasury shares financial

"of which, 223,031,204 were held as treasury shares;"

Treasury shares are a company’s own stock that it has repurchased and keeps on its books instead of canceling or leaving in the hands of outside investors. Think of them like coupons a business puts back in a drawer: they don’t vote or receive dividends while held, but they can be reissued later for employee pay or fundraising. For investors this matters because buybacks change the number of shares that count toward earnings and ownership, can boost per‑share metrics, and use corporate cash that might otherwise go to growth or dividends.

Euro Medium Term Note Programme financial

"Euro 20,000,000,000 Euro Medium Term Note Programme."

A euro medium term note programme is an ongoing arrangement that lets a borrower repeatedly issue bonds denominated in euros under a single set of documents, without arranging a new loan each time. Think of it like an approved credit line for selling multiple IOUs with different lengths and interest rates; it matters to investors because it signals how easily the issuer can raise debt, the range of terms available to buy, and the potential impact on credit risk and market liquidity.

Supplementary Prospectus regulatory

"The Supplementary Prospectus dated 4 August 2026 (the "Supplementary Prospectus")"

Prospectus regulatory

"The Prospectus dated 17 August 2026 (the "Prospectus")"

A prospectus is a detailed document that explains a company's plans for offering new shares or investments to the public. It’s important because it provides potential investors with key information about the company’s business, risks, and how they might make money, helping them decide whether to invest. Think of it as a guidebook for understanding what you're buying into.

Share Incentive Plan financial

"Monthly purchase of securities ("partnership shares") under the Share Incentive Plan"

A share incentive plan is a company program that gives employees or directors the chance to receive or buy company shares, often after staying with the firm or meeting performance goals. It matters to investors because it’s like giving workers a slice of the company pie to boost performance and loyalty, but issuing those slices can reduce each existing owner’s portion and change metrics such as earnings per share and share count.

Market Abuse Regulation regulatory

"This announcement is made in accordance with Article 19 of the Market Abuse Regulation"

Market abuse regulation consists of laws and rules designed to prevent dishonest or manipulative practices in financial markets. It aims to ensure fair and transparent trading, so investors can trust that markets operate honestly, much like rules that keep a game fair. By reducing unfair advantages, it helps protect investor confidence and promotes healthy, efficient markets.

FAQ

How many National Grid (NGG) shares currently carry voting rights?

As of 31 July 2026, National Grid reported 5,026,800,385 ordinary shares with voting rights. This figure excludes 223,031,204 treasury shares from total registered capital of 5,249,831,589 ordinary shares and is the denominator for UK disclosure threshold calculations.

What is the size of National Grid (NGG)’s Euro Medium Term Note Programme?

National Grid plc and National Grid Electricity Transmission plc have a €20,000,000,000 Euro Medium Term Note Programme. A Supplementary Prospectus dated 4 August 2026 and a new Prospectus dated 17 August 2026 relating to this programme have been approved by the UK Financial Conduct Authority.

What supplementary prospectus did National Grid (NGG) publish in August 2026?

National Grid published a Supplementary Prospectus dated 4 August 2026, supplementing the prospectus dated 19 August 2025, as already supplemented on 23 January 2026, for its €20,000,000,000 Euro Medium Term Note Programme. It has been approved by the Financial Conduct Authority and is available via the National Storage Mechanism.

Which new prospectus did National Grid (NGG) publish on 17 August 2026?

National Grid announced a Prospectus dated 17 August 2026 for the €20,000,000,000 Euro Medium Term Note Programme of National Grid plc and National Grid Electricity Transmission plc. The Financial Conduct Authority approved it, and it is available through the UK National Storage Mechanism.

What PDMR share transaction involving National Grid (NGG) was disclosed?

National Grid disclosed that Chief Financial Officer Andy Agg made a monthly purchase of 12 ordinary shares on 7 August 2026 at a price of GBP 11.9781 per share under the company’s Share Incentive Plan, reported in accordance with the Market Abuse Regulation.

How many treasury shares does National Grid (NGG) hold?

National Grid stated that, as of 31 July 2026, it held 223,031,204 ordinary shares as treasury shares out of total registered capital of 5,249,831,589 ordinary shares, leaving 5,026,800,385 shares carrying voting rights.

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Form 6-K: How Foreign Companies Report to the SEC →

Available on EDGAR 08/28/2026 - 08:45 AM Accepted by SEC EDGAR 08/28/2026 - 06:46 AM Learn about SEC filing dates

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: 28 August 2026

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 03 August 2026— Total Voting Rights
99.2	Exhibit 99.2 Announcement sent to the London Stock Exchange on 04 August 2026— Publication of a Supplementary Prospectus
99.3	Exhibit 99.3 Announcement sent to the London Stock Exchange on 10 August 2026— Director/PDMR Shareholding
99.4	Exhibit 99.4 Announcement sent to the London Stock Exchange on 17 August 2026— Publication of a Prospectus

Exhibit 99.1

3 August 2026

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

Voting Rights update

National Grid's registered capital as of 31 July 2026 consisted of 5,249,831,589 ordinary shares, of which, 223,031,204 were held as treasury shares; leaving a balance of 5,026,800,385 with voting rights.

The figure of 5,026,800,385 may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, National Grid under the FCA's Disclosure Guidance and Transparency Rules.

Julian Baddeley                              

Group Company Secretary

Exhibit 99.2

4 August 2026

National Grid plc / National Grid Electricity Transmission plc

Publication of a Supplementary Prospectus

The following supplementary prospectus has been approved by the Financial Conduct Authority and is available for viewing:

The Supplementary Prospectus dated 4 August 2026 (the "Supplementary Prospectus") supplementing the prospectus dated 19 August 2025 (as supplemented by the first supplement to the prospectus dated 23 January 2026 (together, the "Prospectus")) for the National Grid plc and National Grid Electricity Transmission plc Euro 20,000,000,000 Euro Medium Term Note Programme.

The Supplementary Prospectus should be read and construed in conjunction with the Prospectus.

To view the full Supplementary Prospectus, please paste the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/2538P_1-2026-8-4.pdf

A copy of the Supplementary Prospectus has been submitted to the National Storage Mechanism and will shortly be available to the public for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism.

For further information, please contact:

Kwok Liu	+44 (0) 7900 405 729 (m)
Deputy Treasurer, Funding & Investment National Grid plc
Ben Davis	+44 (0) 7971 539999
Senior Manager, Media & PR National Grid plc

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Prospectus is not addressed. Prior to relying on the information contained in the Prospectus you must ascertain from the Prospectus whether or not you are part of the intended addressees of the information contained therein.

Your right to access this service is conditional upon complying with the above requirement.

Exhibit 99.3

10 August 2026

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

Notification of Transaction of Person Discharging Managerial Responsibilities ('PDMRs')

This announcement is made in accordance with Article 19 of the Market Abuse Regulation ('MAR'). In accordance with MAR, the relevant Financial Conduct Authority notification is set out below.

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Andy Agg
2	Reason for the notification
a)	Position/status	Chief Financial Officer
b)	Initial notification /Amendment	Initial notification
3	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	National Grid plc
b)	LEI	8R95QZMKZLJX5Q2XR704
4	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted
a)	Description of the financial instrument, type of instrument Identification code	Ordinary shares of 12 204/473p each GB00BDR05C01
b)	Nature of the transaction	Monthly purchase of securities ("partnership shares") under the Share Incentive Plan
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 11.9781	12
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2026.08.07
f)	Place of the transaction	London Stock Exchange (XLON)

Exhibit 99.4

17th August 2026

National Grid plc / National Grid Electricity Transmission plc

Publication of a Prospectus

The following prospectus has been approved by the Financial Conduct Authority and is available for viewing:

The Prospectus dated 17 August 2026 (the "Prospectus") for the National Grid plc and National Grid Electricity Transmission plc Euro 20,000,000,000 Euro Medium Term Note Programme.

To view the full document, please paste the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/9712Q_1-2026-8-17.pdf

A copy of the Prospectus has been submitted to the National Storage Mechanism and will shortly be available to the public for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism.

For further information, please contact:

Kwok Liu	+44 (0) 7900 405 729 (m)
Deputy Treasurer, Funding & Investment National Grid plc
Illtud Harri	+44 (0) 7920 503 600 (m)
Head of Media, Communications & Brand National Grid plc

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Prospectus is not addressed. Prior to relying on the information contained in the Prospectus you must ascertain from the Prospectus whether or not you are part of the intended addressees of the information contained therein.

Your right to access this service is conditional upon complying with the above requirement.

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 plc
	By:	Beth Melges
		Beth Melges Head of Plc Governance

Date: 28 August 2026