Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 (6-k)

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 January 2023

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 January 2023 —Total Voting Rights
99.2	Exhibit 99.2 Announcement sent to the London Stock Exchange on 04 January 2023 — Director/PDMR Shareholding
99.3	Exhibit 99.3 Announcement sent to the London Stock Exchange on 04 January 2023 — Publication of a Supplementary Prospectus
99.4	Exhibit 99.4 Announcement sent to the London Stock Exchange on 10 January 2023 — Director/PDMR Shareholding
99.5	Exhibit 99.5 Announcement sent to the London Stock Exchange on 13 January 2023 — Director/PDMR Shareholding
99.6	Exhibit 99.6 Announcement sent to the London Stock Exchange on 16 January 2023 — Publication of Final Terms

Exhibit 99.1

3 January 2023

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

Voting Rights and Capital Update

National Grid's registered capital as of 31 December 2022 consisted of 3,914,359,015 ordinary shares, of which, 254,041,798 were held as treasury shares; leaving a balance of 3,660,317,217 shares with voting rights.

The figure of 3,660,317,217 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 Disclosure Guidance and Transparency Rules.

Pritti Patel

General Counsel, Corporate and Deputy Company Secretary

Exhibit 99.2

4 January 2023

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

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

This announcement is made in accordance with Article 19 of the Market Abuse Regulation ('MAR') and relates to the National Grid US Employee Stock Purchase Plan ('ESPP') monthly purchase on behalf of a PDMR. The relevant FCA notification is set out below.

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Adriana Karaboutis
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	Monthly purchase of securities under the National Grid US Employee Stock Purchase Plan
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		$51.1819	38.719743
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.03

f)	Place of the transaction	Outside a trading venue

Exhibit 99.3

4 January 2023

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 January 2023 (the "Supplementary Prospectus") supplementing the prospectus dated 11 August 2022 (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/6755L_1-2023-1-4.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

Sonam Patel	+44 (0) 7971 030 775 (m)
Corporate Communications 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 99.4

10 January 2023

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') and relates to the National Grid Share Incentive Plan ('SIP') monthly purchases on behalf of PDMRs.

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 10.499592	14
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.09
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 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 10.499592	14
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.09
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 & 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	Monthly purchase of securities ("partnership shares") under the Share Incentive Plan
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.499592	14
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.09
f)	Place of the transaction	London Stock Exchange (XLON)

Exhibit 99.5

13 January 2023

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') and relates to the National Grid 2022/23 interim dividend scrip alternative and dividend reinvestment under the National Grid Share Incentive Plan ('SIP') on behalf of PDMRs and CAPs.

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	Acquisition of securities ("dividend shares") under the Share Incentive Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.295	69
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.11
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 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 securities ("dividend shares") under the Share Incentive Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.295	101
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.11
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 & 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	Acquisition of securities ("dividend shares") under the Share Incentive Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.295	1
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.11
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Victoria Wood
2	Reason for the notification
a)	Position/status	CAP of Tony Wood, Non-executive Director
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 securities under the Scrip Dividend Scheme.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.1490	36
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.01.11
f)	Place of the transaction	London Stock Exchange (XLON)

Exhibit 99.6

16 January 2023

National Grid plc

Publication of Final Terms

The following final terms have been approved by the Financial Conduct Authority and are available for viewing:

Final Terms in relation to the National Grid plc issues of (i) EUR 750,000,000 3.875 per cent. Instruments due 16 January 2029 and (ii) EUR 1,000,000,000 4.275 per cent. Instruments due 16 January 2035 under the National Grid plc and National Grid Electricity Transmission plc Euro 20,000,000,000 Euro Medium Term Note Programme

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

http://www.rns-pdf.londonstockexchange.com/rns/7417M_1-2023-1-13.pdf

http://www.rns-pdf.londonstockexchange.com/rns/7417M_2-2023-1-13.pdf

A copy of each of the above Final Terms 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

Danielle Dominey-Kent	+44 (0) 1926 656 536
Corporate Communications National Grid plc

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Final Terms may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Base Prospectus for the National Grid plc and National Grid Electricity Transmission plc Euro 20,000,000,000 Euro Medium Term Note Programme, constituted of the Prospectus dated 11 August 2022 and the Supplementary Prospectus dated 4 January 2023) only and is not intended for use and should not be relied upon by any person outside these countries. Prior to relying on the information contained in each Final Terms you must ascertain from the Base 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.