National Grid (NGG) updates voting rights as CFO acquires shares under incentive plan

Rhea-AI Filing Summary

National Grid plc reports updated voting rights and a routine executive share purchase. As of 28 February 2026, the company had 5,198,968,690 ordinary shares in issue, including 227,659,512 held as treasury shares, leaving 4,971,309,178 shares carrying voting rights.

The filing also records that Chief Financial Officer Andy Agg acquired 11 ordinary shares on 9 March 2026 at GBP 13.243355 each through a monthly purchase under National Grid’s Share Incentive Plan, a regular employee share scheme.

Key Figures

Ordinary shares in issue: 5,198,968,690 shares Treasury shares: 227,659,512 shares Shares with voting rights: 4,971,309,178 shares +2 more

5 metrics

Ordinary shares in issue 5,198,968,690 shares Registered capital as of 28 February 2026

Treasury shares 227,659,512 shares Held as treasury shares as of 28 February 2026

Shares with voting rights 4,971,309,178 shares Voting rights denominator as of 28 February 2026

CFO share purchase volume 11 shares Monthly Share Incentive Plan purchase on 9 March 2026

CFO share purchase price GBP 13.243355 per share Share Incentive Plan acquisition on London Stock Exchange

Key Terms

treasury shares, Disclosure Guidance and Transparency Rules, Market Abuse Regulation, Share Incentive Plan, +1 more

5 terms

treasury shares financial

"of which, 227,659,512 were held as treasury shares; leaving a balance"

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.

Disclosure Guidance and Transparency Rules regulatory

"to notify their interest in, or a change to their interest in, National Grid under the FCA's Disclosure Guidance and Transparency Rules."

Disclosure guidance and transparency rules are the standards and regulations that require companies to share clear, timely information about their finances, risks, operations and material events. They matter to investors because consistent, honest reporting is like a car’s dashboard — it reveals the data you need to judge safety and performance and make informed buying or selling decisions. Strong disclosure reduces surprises and helps keep markets fair and efficient.

Market Abuse Regulation regulatory

"This announcement is made in accordance with Article 19 of the Market Abuse Regulation ('MAR')."

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.

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.

Persons Discharging Managerial Responsibilities regulatory

"Notification of Transactions of Persons Discharging Managerial Responsibilities ('PDMRs')"

Persons Discharging Managerial Responsibilities are the key people in a company who make big decisions, like top managers or executives. Knowing who they are is important because their actions can influence the company’s success or failure, and they are often required to share information about their dealings to ensure transparency for investors and the public.

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

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: 31 March 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 02 March 2026 — Total Voting Rights
99.2	Exhibit 99.2 Announcement sent to the London Stock Exchange on 10 March 2026 — Director/PDMR Shareholding

Exhibit 99.1

2 March 2026

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

Voting Rights update

National Grid's registered capital as of 28 February 2026 consisted of 5,198,968,690 ordinary shares, of which, 227,659,512 were held as treasury shares; leaving a balance of 4,971,309,178 with voting rights.

The figure of 4,971,309,178 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

10 March 2026

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

Notification of Transactions of Persons 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 ('FCA') notifications are 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 13.243355	11
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2026.03.09
f)	Place of the transaction	London Stock Exchange (XLON)

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: 31 March 2026

FAQ

What voting rights update did National Grid (NGG) disclose in this Form 6-K?

National Grid reported that as of 28 February 2026, it had 5,198,968,690 ordinary shares in issue, of which 227,659,512 were held in treasury, leaving 4,971,309,178 shares with voting rights for FCA disclosure calculations.

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

As of 28 February 2026, National Grid stated that 4,971,309,178 ordinary shares carry voting rights. Shareholders can use this figure as the denominator when assessing whether they must notify holdings under FCA Disclosure Guidance and Transparency Rules.

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

National Grid disclosed that out of 5,198,968,690 ordinary shares in registered capital, 227,659,512 are held as treasury shares. Treasury shares do not carry voting rights, reducing the effective voting share count used for regulatory disclosures.

Which National Grid (NGG) executive transacted shares and in what amount?

Chief Financial Officer Andy Agg acquired 11 ordinary shares in National Grid. The purchase took place on 9 March 2026 as part of his monthly participation in the company’s Share Incentive Plan, a regular employee share purchase arrangement.

At what price were the new National Grid (NGG) shares bought under the Share Incentive Plan?

The filing notes that Chief Financial Officer Andy Agg’s 11 partnership shares were purchased at GBP 13.243355 per share. These shares were acquired on 9 March 2026 through National Grid’s Share Incentive Plan on the London Stock Exchange.

Why does National Grid (NGG) publish its total voting rights figure?

National Grid publishes its voting rights figure so investors can use 4,971,309,178 voting shares as the denominator when calculating whether they must notify the FCA of their interest or any change in interest under Disclosure Guidance and Transparency Rules.