Form 6-K - Report of foreign issuer [Rules 13a-16 and 15d-16]

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 August 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 2 August 2023 — Director/PDMR Shareholding
99.2	Exhibit 99.2 Announcement sent to the London Stock Exchange on 2 August 2023 — Total Voting Rights
99.3	Exhibit 99.3 Announcement sent to the London Stock Exchange on 8 August 2023 — Director/PDMR Shareholding
99.4	Exhibit 99.4 Announcement sent to the London Stock Exchange on 10 August 2023 — Director/PDMR Shareholding
99.5	Exhibit 99.5 Announcement sent to the London Stock Exchange on 17 August 2023 — Director/PDMR Shareholding

Exhibit 99.1

2 August 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)
		$56.044325	36.801228
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.01
f)	Place of the transaction	Outside a trading venue

Exhibit 99.2

2 August 2023

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

Voting Rights update

National Grid's registered capital as of 31 July 2023 consisted of 3,930,371,661 ordinary shares, of which, 247,694,171 were held as treasury shares; leaving a balance of 3,682,677,490 with voting rights.

The figure of 3,682,677,490 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.

Pritti Patel

General Counsel, Corporate and Deputy Company Secretary

Exhibit 99.3

8 August 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 9.6844	16
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.07
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 9.6844	16
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.07
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 9.6844	16
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.07
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Ben Wilson
2	Reason for the notification
a)	Position/status	Chief Strategy and External Affairs Officer & Interim President, National Grid Ventures
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 9.6844	16
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.07
f)	Place of the transaction	London Stock Exchange (XLON)

Exhibit 99.4

10 August 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 final 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 9.769446	161
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.09
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	Acquisition of securities ("dividend shares") under the Share Incentive Plan.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 9.769446	229
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.09
f)	Place of the transaction	London Stock Exchange (XLON)

1	Details of the person discharging managerial responsibilities / person closely associated
a)	Name	Ben Wilson
2	Reason for the notification
a)	Position/status	Chief Strategy and External Affairs Officer & Interim President, National Grid Ventures
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 9.769446	1
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	2023.08.09
f)	Place of the transaction	London Stock Exchange (XLON)

Exhibit 99.5

17 August 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 final dividend scrip alternative.

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	Victoria Wood
2	Reason for the notification
a)	Position/status	Closely Associated Person 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 National Grid plc Scrip Dividend Scheme.
c)	Price(s) and volume(s)	Price(s)	Volume(s)
		GBP 10.59	74
d)	Aggregated information - Aggregated volume - Price
e)	Date of the transaction	09.08.2023
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.