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 June 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 02 June 2025— Total Voting Rights
99.2	Exhibit 99.2 Announcement sent to the London Stock Exchange on 10 June 2025— Director/PDMR Shareholding
99.3	Exhibit 99.3 Announcement sent to the London Stock Exchange on 16 June 2025— Director/PDMR Shareholding
99.4	Exhibit 99.4 Announcement sent to the London Stock Exchange on 24 June 2025— Director/PDMR Shareholding

Exhibit 99.1

2 June 2025

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

Voting Rights update

National Grid's registered capital as of 31 May 2025 consisted of 5,132,617,708 ordinary shares, of which, 230,984,649 were held as treasury shares; leaving a balance of 4,901,633,059 with voting rights.

The figure of 4,901,633,059 may be used by shareholders as the denominator for the calculations by which they will determine if they are requiredto 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 June 2025

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

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

This announcement is made in accordance with Article 19of 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 10.35	14
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.09
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	John Pettigrew
2	Reason for the notification
a)	Position/status	Chief Executive
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 10.35	15
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.09
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Will Serle
2	Reason for the notification
a)	Position/status	Chief People 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 10.35	15
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.09
f)	Place of the transaction	London Stock Exchange (XLON)

Exhibit 99.3

16 June 2025

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

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

This announcement is made in accordance with Article 19of the Market Abuse Regulation ('MAR') and relates to the following Executive Directors and PDMRs being granted awards under the Company's Annual Performance Plan ('APP') on 13 June 2025, which relates to a percentage of the award for 2024/25 being paid in shares, and which (after tax on the gross award) must be retained until the shareholding requirement is met, and in any event for two years after receipt. This award is subject to clawback and malus provisions.

For further details of the APP, please see the Company's 2024/25 Annual Report and Accounts.

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	Under the National Grid plc Annual Performance Plan ('APP') Ordinary shares were purchased in the market,which relates to 50% of the APP for 2024/25 being paid in shares.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.586844	21,870
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.13
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	John Pettigrew
2	Reason for the notification
a)	Position/status	Chief Executive
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	Under the National Grid plc Annual Performance Plan ('APP') Ordinary shares were purchased in the market,which relates to 50% of the APP for 2024/25 being paid in shares.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.586844	33,779
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.13
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Justine Campbell
2	Reason for the notification
a)	Position/status	Group Chief Legal 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	Under the National Grid plc Annual Performance Plan ('APP') Ordinary shares were purchased in the market,which relates to 33.33% of the APP for 2024/25 being paid in shares.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.586844	6,531
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.13
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Steve Smith
2	Reason for the notification
a)	Position/status	Chief Strategy and Regulation 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	Under the National Grid plc Annual Performance Plan ('APP') Ordinary shares were purchased in the market,which relates to 33.33% of the APP for 2024/25 being paid in shares.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.586844	5,059
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.13
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Will Serle
2	Reason for the notification
a)	Position/status	Chief People and Culture 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	Under the National Grid plc Annual Performance Plan ('APP') Ordinary shares were purchased in the market,which relates to 33.33% of the APP for 2024/25 being paid in shares.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.586844	5,500
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.13
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Courtney Geduldig
2	Reason for the notification
a)	Position/status	Chief Corporate Affairs 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	American Depository Shares  US 6362744095
b)	Nature of the transaction	Under the National Grid plc Annual Performance Plan ('APP') American Depositary Shares ('ADS') were purchased in the market, which relates to 33.33% of the APP for 2024/25 being paid in shares.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		USD 72.665000	1,436
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.13
f)	Place of the transaction	Outside of a Trading Venue

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Talvis Love
2	Reason for the notification
a)	Position/status	Chief Information and Digital 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	American Depository Shares  US 6362744095
b)	Nature of the transaction	Under the National Grid plc Annual Performance Plan ('APP') American Depositary Shares ('ADS') were purchased in the market, which relates to 33.33% of the APP for 2024/25 being paid in shares.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		USD 72.665000	1,570
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.13
f)	Place of the transaction	Outside of a Trading Venue

Exhibit 99.4

24 June 2025

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

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

This announcement is made in accordance with Article 19of the Market Abuse Regulation ('MAR') and relates to the following PDMRs being granted awards under the Company's Long Term Performance Plan ('LTPP') on 23 June 2025.

Each of the LTPP Awards will vest on or after 30 June 2028 and are conditional on continued employment and on the satisfaction of the performance conditions approved by the Remuneration Committee.

In addition, as disclosed in the Company's 2024/25 Annual Report and Accounts, Executive Directors are required to retain the after-tax value of any shares under the LTPP award until the shareholding requirement is met, and in any event for two years after receipt. The LTPP award is subject to clawback and malus provisions. For further details of the LTPP, please see the Company's 2024/25 Annual Report and Accounts.

In accordance with MAR, the relevant Financial Conduct Authority 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	Acquisition of a conditional award over securities, for nil consideration, under the Long Term Performance Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		Nil	230,976
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.23
f)	Place of the transaction	Outside of a Trading Venue

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Justine Campbell
2	Reason for the notification
a)	Position/status	Chief Legal 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	Acquisition of a conditional award over securities, for nil consideration, under the Long Term Performance Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		Nil	140,014
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.23
f)	Place of the transaction	Outside of a Trading Venue

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Courtney Geduldig
2	Reason for the notification
a)	Position/status	Chief Corporate Affairs 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	American Depository Shares  US 6362744095
b)	Nature of the transaction	Acquisition of a conditional award over securities, for nil consideration, under the Long Term Performance Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		Nil	21,260
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.23
f)	Place of the transaction	Outside of a Trading Venue

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Talvis Love
2	Reason for the notification
a)	Position/status	Chief Information and Digital 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	American Depository Shares  US 6362744095
b)	Nature of the transaction	Acquisition of a conditional award over securities, for nil consideration, under the Long Term Performance Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		Nil	25,479
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.23
f)	Place of the transaction	Outside of a Trading Venue

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	John Pettigrew
2	Reason for the notification
a)	Position/status	Chief Executive
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	Acquisition of a conditional award over securities, for nil consideration, under the Long Term Performance Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		Nil	409,397
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.23
f)	Place of the transaction	Outside of a Trading Venue

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Will Serle
2	Reason for the notification
a)	Position/status	Chief People 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	Acquisition of a conditional award over securities, for nil consideration, under the Long Term Performance Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		Nil	125,140
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.23
f)	Place of the transaction	Outside of a Trading Venue

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Steve Smith
2	Reason for the notification
a)	Position/status	Chief Strategy and Regulations 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	Acquisition of a conditional award over securities, for nil consideration, under the Long Term Performance Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		Nil	114,047
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2025.06.23
f)	Place of the transaction	Outside of a Trading Venue

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:30 June 2025